研究目的
Investigating the generation of few-cycle laser pulses with high temporal contrast via nonlinear elliptical polarisation rotation in a hollow fibre compressor.
研究成果
NER and post-compression can be combined in a hollow fibre compressor device to generate few-cycle pulses with high temporal fidelity and continuously tunable duration. The approach could be efficiently implemented at the multi-mJ energy level and is ideally suited to the post-compression of longer pulses delivered from fibre and thin-disk lasers.
研究不足
The minimal compressed pulse duration (5 fs) and maximum internal efficiency (～47%) were limited by the fibre geometry. The temporal contrast enhancement was limited by the polarization extinction ratio of the analyzer used.
1：Experimental Design and Method Selection:
The experiment involved the use of nonlinear elliptical polarization rotation (NER) in a stretched flexible hollow fibre compressor for temporal filtering and compression of laser pulses.
2：Sample Selection and Data Sources:
30 fs laser pulses from a chirped pulse amplification (CPA) system were used.
3：List of Experimental Equipment and Materials:
A combination of an achromatic λ/2 waveplate, reflective broadband polarizers, achromatic λ/4 wave plates, a stretched flexible hollow-core fibre (SF-HCF), and Argon gas were used.
4：Experimental Procedures and Operational Workflow:
The pulses were attenuated, elliptically polarized, coupled into the SF-HCF, and then sent through a second achromatic λ/4 waveplate and a polarizer for discrimination.
5：Data Analysis Methods:
Temporal characterization was performed using a Wizzler-USP device.
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