Title :
Improvement of THG performance by suppression of photo-induced damages in GdYCOB
Author :
Nakao, H. ; Furuya, Hiroyuki ; Yamada, I. ; Yap, Y.K. ; Yoshimura, M. ; Mori, Y. ; Sasaki, T. ; Ruan, Y.
Author_Institution :
Sakai Chem. Ind. Co. Ltd., Osaka, Japan
Abstract :
Summary form only given.Ultraviolet (UV) lasers have been in demand for various industrial and medical applications. ReCa/sub 4/O(BO/sub 3/)/sub 3/ (Re:rare-earth ion) is one of the attractive nonlinear optical borate crystals. Recently we have developed Gd/sub x/Y/sub 1-x/Ca/sub 4/O(BO/sub 3/)/sub 3/ (GdYCOB) to achieve noncritical phase-matching (NCPM) condition for third-harmonic generation (THG) of Nd:YAG laser. however, in THG operation, the performance was limited by two types of photoinduced damages. It was found that one is gray-track, the other is photorefractive damage. In this paper, suppression of the photo-induced damages and the origin of gray-track are reported.
Keywords :
gadolinium compounds; laser beam effects; optical harmonic generation; optical materials; optical phase matching; photorefractive materials; yttrium compounds; Gd/sub x/Y/sub 1-x/Ca/sub 4/O(BO/sub 3/)/sub 3/; GdYCOB; GdYCa/sub 4/O(BO/sub 3/)/sub 3/; Nd:YAG laser; ReCa/sub 4/O(BO/sub 3/)/sub 3/; THG operation; THG performance; YAG:Nd; YAl5O12:Nd; gray-track; noncritical phase-matchin; nonlinear optical borate crystals; photo-induced damages; photoinduced damages; photorefractive damage; third-harmonic generation; ultraviolet lasers; Biomedical equipment; Biomedical optical imaging; Crystals; Frequency conversion; Medical services; Nonlinear optics; Optical frequency conversion; Optical harmonic generation; Particle beam optics; Photorefractive effect;
Conference_Titel :
Lasers and Electro-Optics, 2000. (CLEO 2000). Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-634-6
DOI :
10.1109/CLEO.2000.907207