Diode-pumped passively Q-switched intracavity-frequency-doubling Nd : GdVO4/KTP green laser with Cr4+: YAG saturable absorber

摘要

The intracavity photon density is assumed to be Gaussian spatial distributions and the nonlinear loss that is due to second- harmonic generation ( SHG) to the photon- density equation is given under Gaussian spatial distributions in the rate equations for a diode- pumped passively Q- switched intracavityfrequencydoubling Nd: GdVO4/ KTP laser with Cr4+: YAG saturable absorber. These space- dependent rate equations are solved numerically. The dependences of pulse width, pulse repetition rate, single- pulse energy and peak power on incident pump power are obtained for the generated- green- laser pulses. In the experiment, a diode- pumped passively Q- switched intracavity- frequency- doubling Nd: GdVO4/ KTP laser with Cr4+: YAG saturable absorber is realized and the experimental results are consistent with the numerical solutions.