Continuous wave laser radiation at 693 nm from LiNbO3 : ZnO : Nd3+ nonlinear laser crystal

Red laser radiation at 693 nm has been obtained from a LiNbO:ZnO:Nd crystal by self-frequency-doubling its fundamental laser line at 1386 nm. Pumping was achieved by means of a Ti:sapphire laser. In preliminary experiments a red laser power of 2.3 mW has been obtained for a total absorbed pump power of 800 mW. External second-harmonic experiments (1386-693 nm) are used to investigate some basic nonlinear properties such as phase-matching angle, a ngular and thermal acceptances of this process.