Abstract

A single-mode deep-UV laser at 191.7 nm is demonstrated by seventh-harmonic generation of a single-mode 1342 nm Nd:YVO4 laser. The fundamental laser is an injection-locked, Q-switched ring laser at 10 kHz pulse repetition frequency. By cascaded second-harmonic and sum-frequency generation, an average power of 230 mW at 191.7 nm is achieved. At 185 mW, the setup features a Gaussian beam with a beam quality factor of M2<1.5. A pulse duration of 9 ns with pulse energy fluctuations of σ<3% is obtained. The long-term spectral width is approximately 240 MHz full width at half-maximum, measured with a homemade scanning confocal Fabry–Perot interferometer. This work opens possibilities in fiber Bragg grating production, allowing the inscription of long gratings.

© 2016 Optical Society of America

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