Abstract
A method capable of compensating the thermally induced phase mismatch in second-harmonic generation across a broad spectral range is proposed. Three nonlinear crystals are cascaded in a combination. The crystals at the two ends of the combination perform the frequency conversion. The middle crystal, with opposite sign of the first temperature derivative of phase mismatch, compensates the thermally induced phase mismatch in the first crystal. We theoretically demonstrate that the proposed method can be used to extend the temperature acceptance bandwidth for second-harmonic generation over a broad spectral range. And two examples are studied, frequency conversion from 1064 to 532 nm with Type II phase matching and 532 to 266 nm with Type I phase matching. The temperature acceptance bandwidth of the crystal combination is double that of a single crystal.
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