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Demonstration of long-term reliability of a 266-nm, continuous-wave, frequency-quadrupled solid-state laser using ?-BaB_2O_4

1998; Optica Publishing Group; Volume: 23; Issue: 3 Linguagem: Inglês

10.1364/ol.23.000195

1539-4794

Kenji Kondo, M. Oka, Hiroyuki Wada, T. Fukui, Nobuhiko Umezu, Kouichi Tatsuki, Shigeo Kubota,

Advanced Fiber Laser Technologies

We report what we believe to be the first operation of more than 1000??h of a 266-nm (cw) frequency-quadrupled solid-state laser with a 100-mW output. We used ??BaB2O4 (BBO) crystal grown by the Czochralski method to double the green-light (532-nm) wavelength, using an external resonant cavity. The green light was generated with an intracavity frequency-doubled Nd:YVO4 laser pumped by a 4-W laser diode. When the incident 532-nm power on the external resonant doubler was 500??mW, we generated 100??mW of cw 266-nm radiation with the BBO crystal. The degradation rate seems to be proportional to the strength of the UV optical electric field. We also obtained a relative intensity noise of -130 dB/Hz at frequencies of 2 to 10??MHz for 266-nm laser light.