Abstract
We have generated up to 4 mW of single frequency cw ultraviolet (UV) radiation between 243 and 247 nm by mixing the output of an ultraviolet argon-ion laser at 363.8 nm and a red LD 700 dye laser in a 90° phase matched ammonium dihydrogen phosphate crystal. Both the dye laser intensity and the UV laser intensity within the crystal have been enhanced by using two intersecting actively locked passive ring cavities. Wavelengths near 243.1 nm are of particular interest for high resolution spectroscopy of atomic hydrogen.
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