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Femtosecond mid-IR difference-frequency generation in LiInSe2

Marcus Beutler, Ingo Rimke, Edlef Büttner, Valentin Petrov, and Ludmila Isaenko

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Abstract

We employ LiInSe2 nonlinear crystal for difference-frequency generation between signal and idler of a synchronously pumped femtosecond optical parametric oscillator at 80 MHz achieving continuous tuning from 4 µm (16.7 mW) to 11.5 µm (2.3 mW).

© 2013 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Internal phase-matching angle φ and spatial walk-off angles ρ1,3 for type-II DFG in LISe valid for mixing signal and idler pulses from an 800-nm pumped SPOPO (a) and corresponding GVM parameters (b). The indices 1,2,3 denote DFG, idler, and signal pulses.

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Fig. 2
Fig. 2 Schematic of the DFG set-up. BC: beam combiner (dichroic mirror), P: periscope for polarization rotation, L: focusing lens, R: retro-reflector in delay line (also adjusting the beam height), X: LISe crystal, F: 3.6-µm cut-on Ge-filter.

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Fig. 3
Fig. 3 Average power (corrected for the 3.6 µm cut-on Ge-filter) (a) and external quantum conversion efficiency (b) versus DFG wavelength obtained with the 4-mm AR-coated LISe crystal in comparison to a 2-mm thick uncoated AGS reference sample.

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Fig. 4
Fig. 4 Recorded DFG spectra demonstrating the achieved spectral tunability (a) and recorded autocorrelation function at 7.2 µm (b) with LISe.

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