GENERATION OF 90-MW CONTINUOUS-WAVE TUNABLE LASER-LIGHT AT 280-NM BY FREQUENCY-DOUBLING IN A KDP CRYSTAL

Laser light at a wavelength of 560 nm from a commercial ring dye laser has been frequency doubled in an external enhancement cavity with a K DP crystal. The cavity employs a new design consisting of only three m irrors, permitting a shorter cavity length as well as compensation for astigmatism and coma. With an input power of similar to 950 mW of gre en light, similar to 90 mW of UV Light has been produced. The waveleng th of the UV Light can be tuned corresponding to +/-3 nm by angle tuni ng of the crystal, and the optical frequency can be scanned electronic ally up to +/-10 GHz.