We overview our recent progress on developing nonlinear quadratic technologies for femtosecond lasers at 1 μmicron. Quadratic optical nonlinearity χ(2) can be exploited in femtosecond lasers and regarded as a significant new degree of freedom for the design of short-pulse sources.
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.
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