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Novel fine frequency tuning of the deep-ultraviolet single-mode coherent light at 252 nm was investigated by changing the temperature of the β-BaB2O4 (BBO) in doubly resonant external cavity for the sum-frequency mixing of 373-nm light and 780-nm light. The temperature-dependant frequency tuning rate is 19.3 MHz/°C, which is fine enough to realize the laser cooling of neutral silicon atoms.

Fine Frequency Tuning in Sum-Frequency Generation of Continuous-Wave Single-Frequency Deep Ultraviolet Coherent Light with Dual-Wavelength Enhancement