Note: a simple technique for reduction of the fall time and enhancement of the peak power of diode side-pumped intracavity frequency doubled repetitively Q-switched green laser pulse.

A simple method to reduce the fall time and enhancement of peak power of intracavity generated Q-switched green pulses is demonstrated. In this method, a mirror with partial transmission at the fundamental lasing wavelength is inserted in front of the nonlinear crystal inside a conventional linear intracavity frequency doubled configuration to form two coupled sub-cavities. The coupled cavity configuration exhibits considerable improvement in the pulse quality. The fall time and timing jitter of the green pulses are reduced by a factor of 2.5 and 4.5, respectively, in comparison to an intracavity frequency doubled system with nearly identical cavity parameters and the peak power of the green pulses is considerably increased. The pulse shape from the Q-switched coupled cavity green laser system is analyzed using the rate equation model. The simulation results are in good agreement with the experiment.