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Polarization-insensitive, high-gain parametric amplification of radially polarized femtosecond pulses
Optica ( IF 10.4 ) Pub Date : 2021-01-11 , DOI: 10.1364/optica.413328
Haizhe Zhong , Chengchuan Liang , Shengying Dai , Jiefeng Huang , Saisai Hu , Changwen Xu , Liejia Qian

Radially polarized lasers, in contrast to the conventional Gaussian laser mode, possess unique features such as sharp focusing and strong longitudinal fields. Thus far, radially polarized femtosecond pulses have been produced only by low-power devices such as mode-locked resonators and segmented half-wave plates. It is imperative to solve the bottleneck problem in generating higher powers and shorter durations. This paper reports on a polarization-insensitive, high-gain optical parametric amplifier for radially polarized femtosecond pulses, which works at type-II phase-matching and approximately degenerate wavelength. We experimentally demonstrate ${\gt}1000$-fold amplification of radially polarized ${\sim}{400}\;{\rm fs}$ pulses at 1610 nm, via chirped ${\sim}{280}\;{\rm fs}$ pumping at 800 nm, with the axially symmetric intensity profile and radial polarization state both being well-maintained within a 20 nm spectral range. With currently available high-energy picosecond pumping, the demonstrated amplification scheme will be promising to create radially polarized femtosecond pulses with ultrahigh powers and may facilitate future applications such as strong-field physics.

中文翻译:

径向极化飞秒脉冲的极化不敏感,高增益参数放大

与传统的高斯激光模式相比,径向偏振激光具有独特的功能,例如清晰的聚焦和强大的纵向场。迄今为止,径向极化的飞秒脉冲仅由锁模谐振器和分段半波片之类的低功率器件产生。必须解决产生更高功率和更短持续时间的瓶颈问题。本文报道了一种用于偏振偏振飞秒脉冲的对偏振不敏感的高增益光学参量放大器,该放大器在II型相位匹配和近似简并的波长下工作。我们通过chi证明了径向极化的$ {\ sim} {400} \; {\ rm fs} $脉冲在1610 nm处的chi放大了{{\ gt} 1000 $$ {\ sim} {280} \; {\ rm fs} $在800 nm处泵浦,轴向对称强度分布和径向偏振态都保持在20 nm光谱范围内。利用当前可用的高能皮秒泵浦,已证明的放大方案将有望产生具有超高功率的径向极化飞秒脉冲,并可能促进诸如强场物理学之类的未来应用。
更新日期:2021-01-21
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