Group‐velocity‐matched second‐harmonic generation: An efficient scheme for femtosecond ultraviolet pulse generation in periodically domain‐inverted β‐BaB2O4

With the combined use of the group‐velocity‐matched and the quasi‐phase‐matched frequency doubling in β‐BaB2O4, femtosecond ultraviolet pulse generation is found to be realizable with high efficiency. Calculation of the group‐velocity mismatch shows that at ∼630 nm wavelength of the pump pulse the mismatch vanishes completely. Typical design parameters such as the walk‐off length, the dispersion lengths, and the quasi‐phase‐matching period are evaluated numerically around the zero walk‐off wavelength. Temperature tuning of the operation wavelength is investigated as well.

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