Down-conversion in the 4–18 μm range with GaSe and AgGaSe2 nonlinear crystals

Refractive index dispersion of chalcopyrite crystals

“…The values of the long wavelength birefringence agree well with those found by Wemple et aZ(1975). The phase-matching angles for different nonlinear interactions calculated using these dispersion parameters also agree with many experimental findings (Bhar 1976, Bianchi andGarbi 1979) including those beyond the nominal infrared transmission range (Seymour and Zernike 1976). The long wavelength birefringence is positive for some crystals while negative for the others, since it consists of two contributions usually of opposite sign.…”

A proposed tunable coherent 16 mu m source in noncritically phase-matched CdSe and AgGaSe2

“…We take the interaction (Bhar et a1 1972) to be the difference mixing of the signal and idler from an optical parametric scillator (OPO). Such a technique has so far been used only under a critical phase matching condition (Hanna et al 1974, Andreou 1978, Bianchi and Garbi 1979. Temperature tuning shows that the NCPM tuning range is rather small, 16.2-17.9 pm for a temperature change -200 "C to 200 "C when an 1.833 pm laser-pumped OPO is used.…”

Growth improvement of AgGaSe2 single crystal using the vertical Bridgman technique with steady ampoule rotation and its characterization

“…It is one of the attractive IR nonlinear optical materials for device applications due to its unique properties, including large nonlinear optical devices such as optical parametric oscillators, different frequency conversions, second harmonic generators, etc. [2][3][4]. Applications included lidar gas analyzers, optoelectronic stations for suppression, laser radars, IR tracking and IR guidance [5].…”