Efficient β-BaB<formula><roman>2</roman></formula>O<formula><roman>4</roman></formula> frequency-doubler for ultraviolet laser spectroscopy of radionuclides

Efficient frequency-doubling systems with a specific geometry configuration are used in order to obtain ultraviolet (UV) cw coherent radiation for laser spectroscopy of exotic radionuclides in the 30 ≤ Z ≥ 58 region. The compensation of the walk-off angle and the use of external cavity for second harmonic generation give most noticeable doubler efficiency increase. Three frequency-conversion systems are proposed for laser spectroscopy of nuclei. Second harmonic efficiency of 18% is obtained. Perspectives of using the injection seeded nonlinear converters in laser spectroscopy are also discussed.