Abstract
Gadolinium calcium oxoborate, Ca 4GdO(BO 3) 3 (GdCOB), is an efficient nonlinear borate crystal presenting suitable sites for activator ions. Nd 3+ doped GdCOB has been investigated as a new laser crystal in order to develop a self-frequency doubling material. Large and good optical quality crystals of Nd:GdCOB have been grown from the melt. Nd 3+ optical properties were studied via Judd-Ofelt analysis. Nd 3+ polarized absorption and emission cross sections were measured at room temperature. Stark levels of Nd 3+ 4L j manifolds in GdCOB are given. Nd:GdCOB laser has been demonstrated, with a cw Ti:sapphire pump source, for several Nd 3+ concentrations. The crystal was shown to lase along its three crystallophysic axes. The best slope efficiency is 45 % for the fundamental laser output at 1.060 μm. According to the infrared laser output polarization, configuration of Nd:GdCOB crystals, for type I self-frequency doubling in ZX and XY principal planes, were investigated. A 0.530 μm green laser was observed by self-frequency doubling. Linear and nonlinear optical properties of Nd:GdCOB are compared to those of NYAB in the prospect of self-frequency doubling applications.
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