Optical EngineeringFractional thermal loading and effective stimulated-emission cross section of diode double-end-pumped Nd:YVO4 crystal
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Studies on a diode double-end-pumped Nd:YVO4 laser operating in the fundamental mode with a maximum cw output power of 14.8 W are reported. Measurements were taken with an a-axis-cut crystal in the form of a rectangular bar of size 4×4×10 mm with doping concentration 1.1 at.%, using a diode double-end-pumped resonator configuration operating in the cw TEM00 mode. The pumping arrangement mainly consists of two fiber-coupled diode-laser arrays with a maximum output power of 30 W and output wavelength range of 807 to 810 nm at 25°C set temperature. Since the quality of the pump beam and the actual focused spot size are important parameters for overlap optimization of the pump and cavity modes, these two parameters are calculated for this set up. The fractional thermal loading and effective stimulated emission cross section for 4F3/2→4I11/2 transition of 1.1-at.% doped Nd:YVO4 crystal are calculated using the planar resonator configuration stabilized by pump-power-induced thermal lensing. The focal length of the effective lens and its variation with the absorbed pump power are determined from the far-field divergence angle of the output beam.