The propagation of femtosecond laser filaments in air with continuously varying pressures
The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depen...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Feng, ZhiFang [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2022transfer abstract |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis - Niu, Zhenzhen ELSEVIER, 2020, Amsterdam |
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| Übergeordnetes Werk: |
volume:502 ; year:2022 ; day:1 ; month:01 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.optcom.2021.127404 |
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ELV055351786 |
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| 245 | 1 | 4 | |a The propagation of femtosecond laser filaments in air with continuously varying pressures |
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| 520 | |a The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. | ||
| 520 | |a The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. | ||
| 650 | 7 | |a Self-focusing |2 Elsevier | |
| 650 | 7 | |a Ultrafast nonlinear optics |2 Elsevier | |
| 650 | 7 | |a Continuously varying pressures |2 Elsevier | |
| 650 | 7 | |a Nonlinear optics |2 Elsevier | |
| 700 | 1 | |a Li, Rong |4 oth | |
| 700 | 1 | |a Li, Wei |4 oth | |
| 700 | 1 | |a Liu, Yuan |4 oth | |
| 700 | 1 | |a Shu, XiaoFang |4 oth | |
| 700 | 1 | |a Yu, ChengXin |4 oth | |
| 700 | 1 | |a Li, Jinhong |4 oth | |
| 700 | 1 | |a Liu, Xun |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |a Niu, Zhenzhen ELSEVIER |t Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis |d 2020 |g Amsterdam |w (DE-627)ELV004103645 |
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10.1016/j.optcom.2021.127404 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001533.pica (DE-627)ELV055351786 (ELSEVIER)S0030-4018(21)00653-2 DE-627 ger DE-627 rakwb eng 580 VZ AFRIKA DE-30 fid BIODIV DE-30 fid 42.38 bkl Feng, ZhiFang verfasserin aut The propagation of femtosecond laser filaments in air with continuously varying pressures 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. Self-focusing Elsevier Ultrafast nonlinear optics Elsevier Continuously varying pressures Elsevier Nonlinear optics Elsevier Li, Rong oth Li, Wei oth Liu, Yuan oth Shu, XiaoFang oth Yu, ChengXin oth Li, Jinhong oth Liu, Xun oth Enthalten in Niu, Zhenzhen ELSEVIER Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis 2020 Amsterdam (DE-627)ELV004103645 volume:502 year:2022 day:1 month:01 pages:0 https://doi.org/10.1016/j.optcom.2021.127404 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-AFRIKA FID-BIODIV 42.38 Botanik: Allgemeines VZ AR 502 2022 1 0101 0 |
| spelling |
10.1016/j.optcom.2021.127404 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001533.pica (DE-627)ELV055351786 (ELSEVIER)S0030-4018(21)00653-2 DE-627 ger DE-627 rakwb eng 580 VZ AFRIKA DE-30 fid BIODIV DE-30 fid 42.38 bkl Feng, ZhiFang verfasserin aut The propagation of femtosecond laser filaments in air with continuously varying pressures 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. Self-focusing Elsevier Ultrafast nonlinear optics Elsevier Continuously varying pressures Elsevier Nonlinear optics Elsevier Li, Rong oth Li, Wei oth Liu, Yuan oth Shu, XiaoFang oth Yu, ChengXin oth Li, Jinhong oth Liu, Xun oth Enthalten in Niu, Zhenzhen ELSEVIER Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis 2020 Amsterdam (DE-627)ELV004103645 volume:502 year:2022 day:1 month:01 pages:0 https://doi.org/10.1016/j.optcom.2021.127404 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-AFRIKA FID-BIODIV 42.38 Botanik: Allgemeines VZ AR 502 2022 1 0101 0 |
| allfields_unstemmed |
10.1016/j.optcom.2021.127404 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001533.pica (DE-627)ELV055351786 (ELSEVIER)S0030-4018(21)00653-2 DE-627 ger DE-627 rakwb eng 580 VZ AFRIKA DE-30 fid BIODIV DE-30 fid 42.38 bkl Feng, ZhiFang verfasserin aut The propagation of femtosecond laser filaments in air with continuously varying pressures 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. Self-focusing Elsevier Ultrafast nonlinear optics Elsevier Continuously varying pressures Elsevier Nonlinear optics Elsevier Li, Rong oth Li, Wei oth Liu, Yuan oth Shu, XiaoFang oth Yu, ChengXin oth Li, Jinhong oth Liu, Xun oth Enthalten in Niu, Zhenzhen ELSEVIER Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis 2020 Amsterdam (DE-627)ELV004103645 volume:502 year:2022 day:1 month:01 pages:0 https://doi.org/10.1016/j.optcom.2021.127404 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-AFRIKA FID-BIODIV 42.38 Botanik: Allgemeines VZ AR 502 2022 1 0101 0 |
| allfieldsGer |
10.1016/j.optcom.2021.127404 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001533.pica (DE-627)ELV055351786 (ELSEVIER)S0030-4018(21)00653-2 DE-627 ger DE-627 rakwb eng 580 VZ AFRIKA DE-30 fid BIODIV DE-30 fid 42.38 bkl Feng, ZhiFang verfasserin aut The propagation of femtosecond laser filaments in air with continuously varying pressures 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. Self-focusing Elsevier Ultrafast nonlinear optics Elsevier Continuously varying pressures Elsevier Nonlinear optics Elsevier Li, Rong oth Li, Wei oth Liu, Yuan oth Shu, XiaoFang oth Yu, ChengXin oth Li, Jinhong oth Liu, Xun oth Enthalten in Niu, Zhenzhen ELSEVIER Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis 2020 Amsterdam (DE-627)ELV004103645 volume:502 year:2022 day:1 month:01 pages:0 https://doi.org/10.1016/j.optcom.2021.127404 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-AFRIKA FID-BIODIV 42.38 Botanik: Allgemeines VZ AR 502 2022 1 0101 0 |
| allfieldsSound |
10.1016/j.optcom.2021.127404 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001533.pica (DE-627)ELV055351786 (ELSEVIER)S0030-4018(21)00653-2 DE-627 ger DE-627 rakwb eng 580 VZ AFRIKA DE-30 fid BIODIV DE-30 fid 42.38 bkl Feng, ZhiFang verfasserin aut The propagation of femtosecond laser filaments in air with continuously varying pressures 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. Self-focusing Elsevier Ultrafast nonlinear optics Elsevier Continuously varying pressures Elsevier Nonlinear optics Elsevier Li, Rong oth Li, Wei oth Liu, Yuan oth Shu, XiaoFang oth Yu, ChengXin oth Li, Jinhong oth Liu, Xun oth Enthalten in Niu, Zhenzhen ELSEVIER Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis 2020 Amsterdam (DE-627)ELV004103645 volume:502 year:2022 day:1 month:01 pages:0 https://doi.org/10.1016/j.optcom.2021.127404 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-AFRIKA FID-BIODIV 42.38 Botanik: Allgemeines VZ AR 502 2022 1 0101 0 |
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Effect of hawthorn seed extract on the gastrointestinal function of rats with diabetic gastroparesis |
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propagation of femtosecond laser filaments in air with continuously varying pressures |
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The propagation of femtosecond laser filaments in air with continuously varying pressures |
| abstract |
The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. |
| abstractGer |
The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. |
| abstract_unstemmed |
The characteristics of the filaments generated by propagating a femtosecond Gaussian beam in a 2 m long gas cell with continuously varying pressures at different focal distances are numerically investigated. The simulated results indicate that the onset distance and the length of the filaments depend sensitively on the variation of pressure. These effects are enhanced with the increase of the focal length for the initial power P i n = 5 P c r . The main reason is that some parameters (the group velocity dispersion, the nonlinear refractive index, multiphoton ionization rate and the neutral atom density) are variational with the gaseous pressure. And the stability of the filament is determined by the combined effect of the pressure and the focal distance. In addition, we discuss the differences of the filament characteristics between the fixed pressure and continuously varying pressures. Through the analyses of the temporal dynamics and supercontinuum spectra, we find that maintaining a large pressure (1 atm) and changing to a large pressure (such as 0 . 3 ∼ 1 atm) are beneficial to the propagation of the filament and the broadening of the spectra. It is interesting that, for fixing the initial energy E i n = 1 mJ, although the critical power of laser pulse is higher at the low pressure, the filament length at the continuously varying pressure p = 0 . 3 ∼ 1 atm is still longer than that of p = 1 ∼ 0 . 3 atm as the focal distance increases. This research is of great significance to remotely detect atmospheric pollutant components. |
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The propagation of femtosecond laser filaments in air with continuously varying pressures |
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Li, Rong Li, Wei Liu, Yuan Shu, XiaoFang Yu, ChengXin Li, Jinhong Liu, Xun |
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