Versatile temperature-insensitive second-harmonic generation by compensating thermally induced phase-mismatch in a two-crystal design
نویسندگان
چکیده
We propose and experimentally demonstrate a novel second-harmonic-generation (SHG) scheme capable of supporting temperature-insensitive phase-matching (PM) at various laser wavelengths. This versatile temperature-insensitive PM is designed by using two cascaded crystals with opposite signs of temperature derivation of phase-mismatch, in which the temperature-induced phase-mismatch in the first crystal is well compensated in the second crystal. Two application examples are studied at the typical wavelengths of ∼ 1.0 and 1.5 μm, respectively. The proof-of-principle experiment, using two crystals of LiB3O5 (LBO) and KH2PO4 (KDP), demonstrates that the temperature-acceptance of PM can be 2 – 3 times larger than that of using a traditional single crystal. The proposed two-crystal design may provide a promising route to high-average-power SHG at various laser wavelengths. E ff ic ie n c y, a .u . 0 0.2 0.4 0.6 0.8 1.0
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