Article

Applied Physics B

, Volume 95, Issue 2, pp 323-328

First online:

High-repetition-rate high-beam-quality 43 W ultraviolet laser with extra-cavity third harmonic generation

  • X. YaAffiliated withState Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University Email author 
  • , Q. LiuAffiliated withState Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University
  • , M. GongAffiliated withState Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University
  • , X. FuAffiliated withState Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University
  • , D. WangAffiliated withState Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University

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Abstract

High-power, high-repetition-rate extra-cavity third harmonic generation of 355 nm with high beam quality has been developed. The acoustic-optical Q-switched Nd:YVO4 MOPA laser including 2- and 4-stage amplifiers was used as the IR source. With the extra-cavity frequency conversion of LBO crystals, 30.2 W TEM00-mode 355 nm UV laser was obtained with a 2-stage amplifier MOPA laser, and the optical-to-optical (1064 nm to 355 nm) conversion efficiency was up to 30%. Enhanced 43 W TEM00 UV laser at 60 kHz was achieved with a 4-stage amplifier MOPA IR laser, and pulse duration was 10.7 ns corresponding to the peak power as high as 67 kW, with single pulse energy of 0.72 mJ. The optical–optical efficiencies from IR and diodes to UV were 28% and 10% respectively.

PACS

42.55.Xi 42.65.Ky 42.60.Gd