Highly efficient frequency conversions were conducted to obtain deep-ultraviolet single-mode coherent light by use of two-stage external cavities. A power of 154 mW at ~252 nm was obtained with a conversion efficiency of more than 8% by doubly resonant sum-frequency mixing of 373-nm light from the first-stage conversion and 780-nm light from a single-mode Ti:sapphire laser. The output performance of the deep-ultraviolet light source is sufficient for use in the laser cooling of neutral silicon atoms.
© 2003 Optical Society of America
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3320) Lasers and laser optics : Laser cooling
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
Hiroshi Kumagai, Katsumi Midorikawa, Tetsuaki Iwane, and Minoru Obara, "Efficient sum-frequency generation of continuous-wave single-frequency coherent light at 252 nm with dual wavelength enhancement," Opt. Lett. 28, 1969-1971 (2003)