Improvement of the frequency-doubling efficiency of high-average-power lasers using multicrystal scheme with opposite thermal properties

Various multicrystal schemes have been widely used in the frequency conversion process of high power lasers or short-pulse lasers. Here we propose and numerically demonstrate a novel multicrystal scheme for improving the frequency-doubling efficiency of high-average-power lasers. Our proposed multicrystal scheme includes two different kinds of nonlinear crystals with opposite thermal properties, in which thermal-induced phase mismatches in the first crystal may be compensated by the next crystal. As a result, the sensitivity of conversion efficiency to temperature deviations is reduced. The simulation results show that the temperature acceptance bandwidth of our two-crystal scheme is 5 times larger than that of common single crystal scheme. And a broader temperature acceptance bandwidth will be obtained if a three-crystal scheme is adopted. More important of all, the temperature-insensitive property of multicrystal scheme is independent of pump wavelength, which means it can be applied in various high-average-power laser systems. OCIS codes: (190.2620) Harmonic generation and mixing, (190.4410) Nonlinear optics, (140.6810) Thermal effects

Abstract licence: CC BY-NC

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