Figen, Z.G.Aytür O.2016-02-082016-02-08200510944087http://hdl.handle.net/11693/24034We report a nanosecond sum-frequency generating optical parametric oscillator based on a single KTiOAsO4 crystal that is simultaneously phase matched for optical parametric generation and sum-frequency generation. Pumped at a wavelength of 1064 nm by a Q-switched Nd:YAG laser, this device produces 10.4-ns-long 8.3 mJ red pulses at a wavelength of 627 nm with 21% energy conversion efficiency. This device provides a simple and efficient method for converting high energy Nd:YAG lasers to a red wavelength. © 2005 Optical Society of America.EnglishElectron energy levelsEnergy conversionLight amplifiersLithium niobateNeodymium lasersNonlinear opticsQ switched lasersSecond harmonic generationSingle crystalsUltraviolet radiationCrystal polingFrequency conversionPhase matchingSum-frequency generation (SFG)UpconversionOptical parametric oscillatorsArticle10.1364/OPEX.13.004896