Second-harmonic generation in Hg0.35Cd0.65Ga2S4 and Hg0.52Cd0.48Ga2S4

Hg0.35Cd0.65Ga2S4 and Hg0.52Cd0.48Ga2S4 have been found to be phase-matchable for type-1 second-harmonic generation (SHG) of the fundamental radiation at 2.907-5.453 μm and 2.423-6.725 μm, respectively. The Sellmeier equations for HgGa2S4 and CdGa2S4 that reproduce well these experimental results as well as the published data for the Cr:forsterite laser (1.25 μm)-pumped Hg0.35Cd0.65Ga2S4 optical parametric generator (OPG) and the Ti:Al2O3 laser (0.820 μm)-pumped Hg0.52Cd0.48Ga2S4 optical parametric amplifier (OPA) at 5.59-9.12 μm are presented.