Highly Efficient Wavelength Conversion of Q-Switched Nd:YAG Lasers Into a Red Wavelength

Yellow nanosecond sum-frequency generating optical parametric oscillator using periodically poled LiNbO3

“…Multistep parametric processes have been known for many years and simultaneous sum-frequency generation in an optical parametric oscillator was first demonstrated by Andrews et al [7]. Recently Figen et al [8] demonstrated the generation of red light by simultaneous phase matching of both the SFG and the OPO in a KTA crystal and Gao et al [9] used periodically poled stoichiometric lithium tantalate to generate red-green-blue laser light.…”