Laser ellipticity-dependent supercontinuum generation by femtosecond laser filamentation in air

Chen, Na; Wang, Zhihui; Zhu, Zhiyuan; Guo, Hao; Liu, Yaoxiang; YIN, FUKANG; Sun, Haiyi; Leng, Yuxin; Li, Ruxin

doi:10.1364/ol.399206

Cited by 17 publications

(6 citation statements)

References 32 publications

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“…It was demonstrated that the clamped intensity is 4 × 10 13 W/cm 2 for a laser pulse of 100 fs duration from theoretical to experimental observations (Figure 3a) [12,32]. Owing to the clamping of the peak intensity inside the filaments, a constant blue shift of the super-continuum spectrum can be expected for pulse energies above a threshold [33].…”

Section: Intensity Clampingmentioning

confidence: 79%

Sensing with Femtosecond Laser Filamentation

Qian

Guo

et al. 2022

Sensors

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Femtosecond laser filamentation is a unique nonlinear optical phenomenon when high-power ultrafast laser propagation in all transparent optical media. During filamentation in the atmosphere, the ultrastrong field of 1013–1014 W/cm2 with a large distance ranging from meter to kilometers can effectively ionize, break, and excite the molecules and fragments, resulting in characteristic fingerprint emissions, which provide a great opportunity for investigating strong-field molecules interaction in complicated environments, especially remote sensing. Additionally, the ultrastrong intensity inside the filament can damage almost all the detectors and ignite various intricate higher order nonlinear optical effects. These extreme physical conditions and complicated phenomena make the sensing and controlling of filamentation challenging. This paper mainly focuses on recent research advances in sensing with femtosecond laser filamentation, including fundamental physics, sensing and manipulating methods, typical filament-based sensing techniques and application scenarios, opportunities, and challenges toward the filament-based remote sensing under different complicated conditions.

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Section: Intensity Clampingmentioning

confidence: 79%

Sensing with Femtosecond Laser Filamentation

Qian

Guo

et al. 2022

Sensors

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“…4(b). The measured plasma temperature of the 1000 Hz filament increases by 22% up to ∼6230 K, which is beneficial for plasma filament-related applications, such as air lasing [12] , three harmonic generation [23] , and supercontinuum generation [8] . The measured plasma temperature is in agreement with Ref.…”

Section: Resultsmentioning

confidence: 99%

“…The propagation of powerful femtosecond laser pulses in air is a very complicated phenomenon that involves a number of nonlinear processes, including four-and six-wave mixing [1,2] , odd harmonics [3,4] , self-focusing and filamentation [5] , self-phase modulation [6] , supercontinuum generation [7,8] , and so on. The self-focusing phenomenon during the nonlinear propagation leads to the ionization of air molecules.…”

Section: Introductionmentioning

confidence: 99%

Pulse repetition rate effect on the plasma inside femtosecond laser filament in air

Yin,

Wang,

Liu

et al. 2024

Chin. Opt. Lett.

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The characteristics of plasmas play an important role in femtosecond laser filament-based applications. Spectroscopic analysis is used to experimentally investigate the plasma density and its temperature of the air filament under different pulse repetition rates. In our experiments, the measured average plasma density of the filament is 1.54 × 10 17 cm −3 and the temperature of the plasma is about 5100 K under 100 Hz pulse repetition rate. The plasma density decreases to 1.43 × 10 17 cm −3 and the temperature increases to 6230 K as the pulse repetition rate increases to 1000 Hz. The experimental observation agrees with the numerical simulation by solving the nonlinear Schrödinger equations with repetition rate related "low density hole" correction.

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“…The dynamic equilibrium between the Kerr self-focusing and plasma-defocusing effects leads to filamentation [1][2][3] . Due to its potential applications in supercontinuum emission [4][5][6] , extreme ultraviolet (EUV) emission [7,8] , air lasing [9,10] , THz radiation [11,12] , remote sensing [13] , guiding of corona discharges [14] , machining [15] and weather control [16] , filamentation of femtosecond laser pulses in optically transparent media has attracted a great deal of attention in recent years. One of the most profound effects during femtosecond filamentation is intensity clamping phenomena.…”

Section: Introductionmentioning

confidence: 99%

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

YIN

Liu

et al. 2023

High Pow Laser Sci Eng

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As intense, ultrashort, kHz-repetition-rate laser systems become commercially available, pulse cumulative effects are critical for laser filament based applications. In this work, the pulse repetition rate effect on the femtosecond laser filamentation in air was investigated both numerically and experimentally. The pulse repetition rate effect has negligible influence at the leading edge of filament. Clear intensity enhancement from high repetition pulse is observed at the peak and tailing edge of laser filament. As the repetition rate of the laser pulses increasing from 100Hz to 1000Hz, the length of filament extends and the intensity inside the filament increases. A physical picture based on the pulse repetition

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Laser ellipticity-dependent supercontinuum generation by femtosecond laser filamentation in air

Cited by 17 publications

References 32 publications

Sensing with Femtosecond Laser Filamentation

Sensing with Femtosecond Laser Filamentation

Pulse repetition rate effect on the plasma inside femtosecond laser filament in air

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

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