High pulse energies of nanosecond-level fourth- and fifth-harmonic (4ω and 5ω) generation of a Nd:YAG laser have been obtained with a CsLiB6O10 (CLBO) nonlinear crystal. 500 mJ of 4ω output with a conversion efficiency of 50% from the second-harmonic input was generated. 5ω output at 213 nm of as high as 230 mJ was obtained by sum-frequency generation of the 266- and 1064-nm beams, corresponding to a 10.4% conversion efficiency of the initial fundamental input energy. The characteristics of the CLBO crystal that permit this effective frequency conversion are discussed.
© 1996 Optical Society of America
Y. K. Yap, M. Inagaki, S. Nakajima, Y. Mori, and T. Sasaki, "High-power fourth- and fifth-harmonic generation of a Nd:YAG laser by means of a CsLiB6O10," Opt. Lett. 21, 1348-1350 (1996)