NONLINEAR LASER CRYSTAL AS A BLUE CONVERTER - LASER-HEATED PEDESTAL GROWTH, SPECTROSCOPIC PROPERTIES AND 2ND-HARMONIC GENERATION OF PURE AND ND3-DOPED K3LI2-XNB5+XO15+2X SINGLE-CRYSTAL FIBERS()

The study of pure and Nd3+-doped K3Li2-xNb5-xO15+2x single crystal fib res with x = 0.24 by the LHPG technique is reported. The wavelength fo r non-critical second harmonic generation phase matching was found to be near 932 nm. Low-temperature spectroscopy reveals that the Nd3+ ion s are located in the A2 sites of the tungsten-bronze structure in diff erent environments. The stimulated emission cross section near 1060 nm of the F-4(3/2) --> I-4(11/2) channel and its branching ratio are det ermined with the help of the Judd-Ofelt analysis.