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We report on preliminary performance of a mid-IR doubly-resonant difference frequency (DFG) spectrometer generating 30 nW of 10.2-/spl mu/m tunable radiation out of 7 mW and 275 mW of the diode laser pump inputs at 778 nm and 842 nm.

We report on preliminary results of a dual-cavity difference-frequency spectrometer generating 30 nW of 10.2-μm tunable radiation out of 7 mW (778 nm) and 275 mW (842 nm) AlGaAs diode laser pump inputs. This device will be used to perform high- resolution saturation spectroscopy in the 9-11μm range, for optical frequency metrology applications.

Second harmonic generation (SHG) of a KCl:Li color center laser, up-conversion (SFM) of a near-IR AlGaAs diode laser by a CO2 laser and non-critical (3ω-ω → 2ω) temperature tuned difference frequency generation (DFG) are reported using silver thiogallate. These parametric processes participate in a frequency chain synthesizing the 13th harmonic of a CO2/OsO4 reference optical standard at 29 THz (10.11µm).

We report the temperature dependence of a continuous-wave noncritically phase-matched (θ=90°) optical parametric amplifier based on a 15-mm-long silver gallium sulfide crystal (AgGaS2) pumped by a 50-mW near-IR AlGaAs diode laser (λ3=0.843 µm). This amplifier is idler seeded by a 15-mW KCl:Li (FA-II) color-center laser (λ1=2.53 µm) and produces microwatt-range power of a signal radiation at λ2=1.265 µm. Updated linear and thermo-optic data of this chalcopyrite material, such as its room-temperature refractive indices and their temperature dependence, are devised from this type I (eoo) 3:1 frequency-division process and from other published data on noncritically phase-matched difference-frequency generation. The resulting dno,e/dT values reproduce fairly well all of the reported results on temperature phase-matched parametric mixing.