研究目的
Demonstrating a doubly Q-switched Nd:YAG laser with single-longitudinal-mode (SLM) output using an electro-optical modulator (EOM) and Cr4+:YAG saturable absorber, and analyzing the effects of Cr4+:YAG initial transmittance on pulse profile, pulse energy, and laser spectra.
研究成果
The doubly Q-switched SLM Nd:YAG laser with EOM and Cr4+:YAG demonstrated excellent properties of beam quality, timing controllability, SLM operation, and symmetric pulses. The system's low cost and simple design make it an ideal choice as the seed of a large-scale laser system and satellite ranging.
研究不足
The longitudinal mode is not stable and has a slight jitter, with temperature change being the main factor accounting for mode jumping. Relevant study on stable mode operation and temperature stability is significant.
1：Experimental Design and Method Selection:
The study utilized a plane-parallel cavity with a length of 50 cm, incorporating a resonant reflector as the laser output coupler and a twisted-mode cavity structure for spatial-hole-burning suppression.
2：Sample Selection and Data Sources:
The gain medium was a Nd:YAG crystal with a Nd3+ concentration of 1%, pumped by a xenon flash lamp.
3：List of Experimental Equipment and Materials:
Equipment included an EOM with a BBO crystal, Cr4+:YAG crystals with various initial transmissions, QWPs, a TFP, and a fast photodetector.
4：Experimental Procedures and Operational Workflow:
The laser's temporal waveform was detected and recorded, and the spectral properties were studied using an FP etalon.
5：Data Analysis Methods:
The symmetric factor of the pulse shape was calculated, and the SLM rate was determined based on the FP interferogram.
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