We have achieved effective third-harmonic generation (THG) by cascading second-harmonic and sum-frequency generation in a single cerium-doped KTiOPO <sub>4</sub> crystal by using femtosecond laser pulses at 1.32 µm. A conversion efficiency of 0.17% was achieved with an average pump power of 35 mW.Furthermore, a unique quadratic power dependence for this type of THG was confirmed. We developed a theory and obtained an analytical solution for the THG.The solution exactly describes the measured characteristics of the THG.
© 2000 Optical Society of America
Xiaodong Mu, Xinhua Gu, Maxim V. Makarov, Yujie J. Ding, Jiyang Wang, Jingqian Wei, and Yaogang Liu, "Third-harmonic generation by cascading second-order nonlinear processes in a cerium-doped KTiOPO4 crystal," Opt. Lett. 25, 117-119 (2000)