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An angle tuned silver gallium selenide (AgGaSe2) optical parametric oscillator (OPO), pumped by the fixed wavelength 1.57 μm output of a noncritically phase-matched KTiOPO4 OPO, yielded radiation continuously tunable from 6 to 14 μm. Energies of up to 1.2 mJ/pulse with bandwidths of ∼5 cm−1 (full width at half-maximum) were obtained using a 6.5×6.5×35.3 mm long, type I AgGaSe2 crystal.
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Chandra et al. (1997) studied this question.
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