本文關(guān)鍵詞：不同能量背景的環(huán)形艾里飛秒激光光束大氣成絲特性（英文）　出處：《紅外與激光工程》2017年08期 　論文類(lèi)型：期刊論文

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【摘要】：自從第一次觀察到飛秒激光大氣成絲后,光絲備受科學(xué)家的關(guān)注。它的潛在應(yīng)用價(jià)值主要包括電子加速、激光雷達(dá)遠(yuǎn)程遙感、太赫茲輻射和超短脈沖壓縮。利用數(shù)值仿真的方法,通過(guò)改變艾里光束的衰減系數(shù),研究了不同能量背景的環(huán)形艾里光束飛秒激光大氣成絲特性,得到的光絲長(zhǎng)度長(zhǎng)于擁有相同峰值功率、弱能量背景高斯光束形成的光絲。通過(guò)分析飛秒激光光絲演化過(guò)程的時(shí)間和空間特性,發(fā)現(xiàn)了環(huán)形能量背景是環(huán)形艾里光束沿傳播方向形成高能量密度光絲的前提條件。比較了環(huán)形艾里光束和高絲光束在成絲過(guò)程中的光譜展寬特性,發(fā)現(xiàn)不同衰減系數(shù)的環(huán)形艾里光束具有相似的光譜展寬特性,但要明顯弱于高斯光束的光譜展寬。研究成果對(duì)與提升飛秒激光成絲效果具有參考意義。
[Abstract]:Since the first observation of femtosecond laser filaments in the atmosphere, optical filaments have attracted the attention of scientists. Their potential applications include electronic acceleration and remote sensing of lidar. Terahertz radiation and ultrashort pulse compression. By changing the attenuation coefficient of the Ellie beam, the filamentary characteristics of femtosecond laser with different energy backgrounds are studied by numerical simulation. The length of the obtained fiber is longer than that formed by Gao Si beam with the same peak power and weak energy background. The temporal and spatial characteristics of the evolution process of femtosecond laser fiber are analyzed. It is found that the annular energy background is the prerequisite for the formation of high energy density optical fiber along the propagation direction of annular Ai beam, and the spectral broadening characteristics of annular Ai beam and high filament beam in the process of filamination are compared. It is found that the annular Airius beams with different attenuation coefficients have similar spectral broadening characteristics, but they are obviously weaker than those of Gao Si beams. The research results have a reference significance for improving the filamentary effect of femtosecond laser.
【作者單位】： 脈沖功率激光技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【分類(lèi)號(hào)】：TN24
【正文快照】： length of filaments can be apparently prolonged0 Introductionthrough the modulation of the confinement parameterof Airy beam.Filamentation induced by femtosecond laserpulses in gases has recently attracted considerable1 Numerical simulation modelinterest

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