We propose and demonstrate a simple approach to lower the thermal quenching effect and improve the output power for Cr:LiSAF lasers, which is accomplished by employing two laser rods in a combined cavity. The resonator contains two laser rods and is designed by using two “X” folding cavities in cascade. CW laser output of ~ 230 mW has been achieved with pump of single-striped laser diodes. Compared with lasers with single gain rod, the laser with dual rods shows less severe thermal effect and increases the output by more than two times.
We overview our recent progress on developing nonlinear quadratic technologies for femtosecond lasers at 1 μmicron. Quadratic optical nonlinearity χ<sup>(2)</sup> can be exploited in femtosecond lasers and regarded as a significant new degree of freedom for the design of short-pulse sources.