Abstract
This study presents a lamp-pumped Nd:glass laser system capable of achieving joule level output energy at 1-Hz repetition rate with high beam quality. The 1.8 J of energy in a 5 ns pulse was achieved with 1.5 mJ injected energy. The laser system includes a beam shaping module and an eight-pass, lamp-pumped amplifier. The laser amplifier demonstrated long-term energy stability of 1.76% PV and 0.29% RMS when operating at 1.8 J for 30 minutes. In a longer period of operation, no damage or obvious beam degradation was found. A uniform gain distribution with a single-pass small-signal gain of 3.89 was acquired with the four-lamp-pumping method, and thermally induced wavefront aberration was mitigated. Finally, a high beam quality was obtained using a homemade optically addressed liquid crystal light valve. After compensation, the near-field modulation decreased from 1.38 to 1.21, meanwhile, the beam contrast decreased from 6.54 to 4.71%. In terms of the far-field quality, a 90% far-field energy concentration was 2.5 times the diffraction limit.
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This work was supported by the Chinese National Natural Science Foundation (Grant No. 61705242) and Shanghai Science and Technology Foundation for Young Scholars (Grant No. 17YF1429600).
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Ji, S., Huang, W., Guo, J. et al. Lamp-pumped eight-pass neodymium glass laser amplifier with high beam quality. Opt Quant Electron 53, 277 (2021). https://doi.org/10.1007/s11082-021-02813-2
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DOI: https://doi.org/10.1007/s11082-021-02813-2