Ultraviolet (UV) light source has very important applications due to its high single photon energy, short laser wavelength and low thermal effect during processing. A high-performance way to acquire UV light source at 355 nm is using sumfrequency method. CsB3O5 (CBO) crystal is a good UV nonlinear optical (NLO) crystal, it can be used to generate UV laser. We acquired high output power UV picosecond (ps) light source at 355 nm through sum-frequency method based on type II phase-matched CBO crystal. As the 1064 nm laser power was 84.8 W, a 30.3 W of 355 nm UV light source with a repetition rate of 600 kHz was achieved. The optical conversion efficiency from the infrared fundamental laser to the UV third-harmonic laser was up to 35.7%. We measured the power stability of the 355 nm UV laser at the maximum power of 30.3 W. The root mean square (RMS) value of the power instability was 0.386% for about thirty minutes. These findings reveal that CBO crystal has great potential in the application of ultrafast UV light source generation with high power.
Ultraviolet (UV) 266-nm nanosecond (ns) laser was obtained through fourth-harmonic-generation by using new nonlinear optical crystals of NaSr3Be3B3O9F4 (NSBBF) with different lengths. Since NSBBF crystals are prone to crack during laser experiments, we added a water-cooling device under NSBBF crystal in the experiment, and compared the experimental results under conditions of water cooling and no water cooling. Moreover, different laser focusing effects were explored to optimize the experimental conditions. The maximum optical conversion efficiency from 532 to 266 nm was 4.8% with the pump power of 2.8 W. The maximum average output power of the 266-nm UV laser was 420 mW when the 532-nm pump power was 23.82 W. The study provides research ideas and experimental basis for NSBBF crystal to realize higher-power 266-nm ns laser output.
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