(1) Department of Physics, Royal Institute of Technology, Roslagstullsbacken 21, 106 91 Stockholm, Sweden;(2) Cobolt AB, Kräftriket 8, 104 05 Stockholm, Sweden;(3) InnoLight GmbH, Garbsener Landstrasse 10, 30419 Hannover, Germany
Abstract:
Non-resonant frequency conversion into the blue, green, orange, and red spectral regions is reported. Fundamental light sources were continuous-wave non-planar monolithic single-mode ring Nd:YAG lasers as well as a standing-wave multi-mode Nd:YAG laser. Periodically poled KTiOPO4 was employed as the nonlinear medium, but the considerations could also be applied to other periodically poled materials. A multi-pass scheme resulted in a normalized conversion efficiency as high as 27.2 %W-1 for frequency doubling in the small-signal regime at 1064 nm. PACS 42.65.Ky; 42.79.Nv; 42.70.Mp