Tunable mid-infrared radiation was generated by difference frequency mixing in a MgO:LiNbO3 crystal placed in a dual wavelength Ti:sapphire laser controlled with an acousto-optical device. A wavelength range from 2.77 to 5.04 µm was demonstrated by tuning the pump pulse of a longer wavelength in coupling with the rotation of the mixing crystal, while the shorter wavelength pulse was fixed at three selected wavelengths of 703, 711 or 719 nm. The maximum average power was 250 µW and the fluctuation was ±10% at 3.05 µm.
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Saito et al. (1999) studied this question.
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