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Chen, B-H.; Nagy, T.; Baum, P. (2018): Efficient middle-infrared generation in LiGaS2 by simultaneous spectral broadening and difference-frequency generation. In: Optics Letters, Vol. 43, No. 8: pp. 1742-1745
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Abstract

We report a surprisingly broadband and efficient midin-frared pulse generation in LiGaS2 (Langasite, LGS) by invoking a simultaneous interplay of intrapulse difference-frequency generation, self-phase modulation, and dispersion. This cascaded mechanism expands the output bandwidth and output power at the same time. With 30-fs driving pulses centered at 1030-nm wavelength we obtain a broadband middle-infrared spectrum of 8-11 mu m with an LGS crystal as thick as 4 mm, which is eight times longer than the walk-off length.