An efficient all-solid-state doubly resonant continuous-wave ultraviolet laser at 284 nm

We report for the first time coherent ultraviolet radiation at 284 nm by intracavity sum-frequency generation of a 607 nm Pr:YLF laser and a 532 nm frequency doubling Nd:YVO₄ laser. The ultraviolet laser is obtained by using double resonator, type-I critical phase matching CsLiB₆O₁₀ (CLBO) crystal sum-frequency mixing. With a total pump power of 18.8 W (3.1 W pump power for the 607 nm Pr:YLF laser and 15.7 W pump power for the 532 nm Nd:YVO₄ frequency doubling laser), a TEM₀₀ mode ultraviolet laser beam at 284 nm of 242 mW is obtained. The power stability is better than 3.4% and laser beam quality M2 factors are 1.13 and 1.22 in the horizontal and vertical dimensions respectively. (letter)