Abstract

We present the results of investigations of nonlinear absorption in alkaline-earth fluoride crystals containing divalent neodymium ions, and also the results of utilizing these crystals for passive Q-switching and mode-locking in solid state lasers radiating in the wavelength range (1.3 - 1.6) micrometers . Spectroscopic parameters of the studied materials such as the effective absorption cross-section and the relaxation time of the state of self-induced transparency (SIT) were estimated. The nature of the residual absorption was determined in these crystals and a simple spectroscopic model describing the SIT process in MeF<SUB>2</SUB>:Nd<SUP>2+</SUP>-crystals is offered. It is demonstrated that MeF<SUB>2</SUB>:Nd<SUP>2+</SUP>-crystals can be used as Q- switches for the lasers of the near IR wavelength range. The results of Q-switching of neodymium and erbium lasers generating in the ranges of 1.3 and 1.54 micrometers , respectively, are presented. The single-peak generation regime and generation of a train of modulated pulses are investigated. The use of SrF<SUB>2</SUB>:Nd<SUP>2+</SUP>-crystals allowed us to realize the mode-locked regime in YAG:Nd-crystal laser, operating on the transition <SUP>4</SUP>F<SUB>3/2</SUB> yields <SUP>4</SUP>I<SUB>13/2</SUB>. Evaluation of the duration of peaks gives the time less than 400 psec.

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