Theory of impurity-induced infrared absorption in cubic crystals

IMPURITY [NDUCED FAR INFRARED ABSORPTION OF CsI CRYSTALS L.GENZEL, W. PRETTL and E.SIEP

In perfect alkali halide crystals only the transverse optic phonons of zero wave vector absorb far infrared radiation in first order. The introduction of impurities in the lattice removes the translational invariance and almost all phonons become optically active. In addition to the absorption at the reststrahlen frequency, impurity induced absorption appears in the phonon band region and somet...

Islanding and strain-induced shifts in the infrared absorption peaks of cubic boron nitride thin films

Experimental and theoretical investigations of the infrared-active, polarization-dependent phonon frequencies of cubic boron nitride films have been performed in light of recent claims that large frequency shifts during initial nucleation are the result of strain caused by highly nonequilibrium growth conditions. We show that the formation of small, separate grains of cubic boron nitride during...

FAR-INFRARED ABSORPTION DUE TO IMPURITIES IN CsBr CRYSTALS

Infrared Absorption Properties of LiH, LiD Mixed Crystals

Blue-light-induced infrared absorption in KNbO3

Owing to its high nonlinearity and low passive losses, KNbO3 has great potential as a medium for efficient frequency doubling and parametric oscillation." 2 For example, KNbO3 has been used successfully for the production of cw blue light by frequency doubling of a dye laser,3 doubling of a semiconductor diode laser,4 and nonlinear mixing of diode and Nd:YAG lasers.5 In recent work we observed ...