High-power, gain-enhanced, internally frequency-converted, Q-switched Nd:YAG lasers

摘要

Optimization of nonlinear coupling and use of aggressive Q-switch clipping on the pulse falling edge has enabled high beam quality, internally frequency-converted, Nd:YAG lasers with output powers greater than 35 W at both green and ultraviolet wavelengths. By retaining more energy in the rod after the pulse, such lasers operate with enhanced gain levels and achieve greater nonlinear conversion. Operation in this gain-enhancement regime has enabled lasers with highly variable pulse-widths. We demonstrate here that gain-enhanced laser operation with variable pulse energy and/or delay between pulses is also possible. This combination of features and flexibility available in gain-enhanced, frequency-converted lasers allows optimization of laser processing for a wide range of candidate materials.