High power Continuous-Wave (CW) DUV lasers are required for high-resolution laser-based angle-resolved photoemission spectroscopy. This technique provides direct observations of band structures and is utilized to study quantum solid states. We realized a high-power 213 nm coherent light source based on fourth harmonic generation of an 852 nm laser for this purpose. Because we have placed importance on its reliability and long-term operation, we use a home-made nonlinear element and a Voice Coil Motor (VCM) cavity locker. We obtained a highest laser power of more than 270 mW and kept the laser power at 50 mW for long-period operation.
We developed a Continuous-Wave (CW) high power 213-nm light source based on a two-stage external cavity SHG scheme based on the scheme developed for 266-nm coherent continuous-wave light generation. We obtained a highest average 213-nm coherent light power of 270 mW and investigated its reliability and long-operation lifetime. Using a homegrown AR-coated β-BaB2O4 (BBO) with a large cavity mode size on the crystal, 100 hours continuous operation without spatial shift of the light spot was demonstrated at 50 mW, which shows more than 3000 hours lifetime with a spatial crystal shift.
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