Abstract
Ultraviolet single mode laser light is proposed by frequency quadrupling the output of a Nd:YLF laser with two successive frequency doubling stages. For a simple linear cavity laser configuration investigated at 1312 nm, we have obtained an intracavity power of 310 W for 16 W of absorbed pump power (λ<sub>p</sub> ~ 806 nm). Up to 10 mW tunable single-frequency laser (λ<sub>2ω</sub>=656-658 <i>nm</i>) is observed. This has been achieved by intracavity second-harmonic generation of a diode-pumped Nd:YLiF<sub>4</sub> linear laser oscillating on the σ-polarized <sup>4</sup>F<sub>3/2</sub>-<sup>4</sup>I<sub>13/2</sub> transition (λ<sub>ω</sub> ~1314 <i>nm</i>) with a β-Barium Borate (BBO) crystal. We also report the experimental measurement of the red-uv conversion efficiency according to the waist size in the BBO crystal. Obtained value is compared to those given by the Boyd-Kleinman theory.
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