Kilowatt-average-power compression of millijoule pulses in a gas-filled multi-pass cell

Single-stage few-cycle nonlinear compression of milliJoule energy Ti:Sa femtosecond pulses in a multipass cell

We report on the nonlinear temporal compression of mJ energy pulses from a Ti:Sa chirped pulse amplifier system in a multipass cell filled with argon. The pulses are compressed from 30 fs down to 5.3 fs, corresponding to two optical cycles. The post-compressed beam exhibits excellent spatial quality and homogeneity. These results pave the way to robust and energy-scalable compression of Ti:Sa pulses down to the few-cycle regime.

多毫焦皮秒脉冲后压缩至接近太瓦量级的少周期脉冲

Post-compression of multi-mJ picosecond pulses to few-cycles approaching the terawatt regime

本研究利用双级充气多通池后压缩技术，将镱InnoSlab激光器的1.2 ps、多毫焦脉冲压缩至9.6 fs，实现125倍压缩比与70%效率，输出约0.3 TW峰值功率，同时提升时间对比度，为多学科研究提供新参数区间的少周期激光源。

分子气体中高能飞秒激光脉冲的拉曼增强光谱压缩

Raman-enhanced spectral compression of high-energy femtosecond laser pulses in molecular gases

本文提出了一种基于气体中非线性传播的高能光谱压缩技术，通过拉曼效应改善压缩过程，实现光谱宽度压缩至5nm，为高能窄带光源提供新方向。

High-energy pulse self-compression and ultraviolet generation through soliton dynamics in hollow capillary fibres

Optical soliton dynamics can cause the extreme alteration of the temporal and spectral shape of a propagating light pulse. They occur at up to kilowatt peak powers in glass-core optical fibres and the gigawatt level in gas-filled microstructured hollow-core fibres. Here we demonstrate optical soliton dynamics in large-core hollow capillary fibres. This enables scaling of soliton effects by several orders of magnitude to the multi-mJ energy and terawatt peak power level. We experimentally demonstrate two key soliton effects. First, we observe self-compression to sub-cycle pulses and infer the c…

Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion

Ultrashort high-energy pulses at wavelengths longer than 1 $μ$m are nowadays desired for a vast variety of applications in ultrafast and strong-field physics. To date, the main answer to the wavelength tunability for energetic, broadband pulses still relies on optical parametric amplification (OPA), which often requires multiple and complex stages, may feature imperfect beam quality and has limited conversion efficiency into one of the amplified waves. In this work, we present a completely different strategy to realize an energy-efficient and scalable laser frequency shifter. This relies on th…