Fig.2 Optical-microscope image of the Y face-cross sec- tion of the bulk domain structure of a 0.4-mm-thick MgO-LiNbO3 crystal after chemical etching.

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Blue EGreen Solid State Lasers Using MgO-LiNbO3 Periodic Domain Inverted Bulk Crystal and Their Applications Koji KAMIYAMA, Yoji OKAZAKI, and Akinori HARADA Fuji Photo Film. Co., Ltd., Miyanodai Technology Development Center 798 Miyanodai, Kaisei-Machi, Ashigarakami-gun, Kanagawa 258-8538 (Received November 13, 1997) A periodically domain inverted crystal has several advantages, such as 1) high conversion efficiency 2) wide temperature tolerance 3) no walk off. Periodically poled MgO-LiNbO3 for blue and green were successfully obtained with uniform periodicity by the novel corona discharge method. Using these crystals in intracavity frequency doubling of a diode-pumped device made it possible to control temperatures of LD and periodically poled MgO-LiNbO3 simultaneously. As a result, we have developed high beam quality, high power stability and compact blue and green solid state lasers. Using these blue and green solid state lasers, a new digital photo printing system and a new fluorescent image analyzer were accomplished. Key Words: MgO-LN periodic domain inverted crystal, SHG, Solid state laser, Blue, Green

Fig.2 Optical-microscope image of the Y face-cross sec- tion of the bulk domain structure of a 0.4-mm-thick MgO-LiNbO3 crystal after chemical etching. Fig.3 Fundamental wavelength dependence of SH power for 2.0-mm-long bulk domain inverted MgO-LiNbO3 with a Ti:Al2O3 laser. SHG:SH generation. Fig.1 Schematic diagram of the experimental setup for corona discharge method.

Fig.4 Basic structure of blue and green diode-pumped intracavity frequency doubling solid-state lasers. Fig.5 Blue and green diode-pumped intracavity frequency doubling solid-state lasers.

(a) Blue (b) Green Fig.6 SH power of intracavity frequency doubling as a function of pumping laser diode (LD) power. SHG:SH generation. Fig.7 Temperature stability of blue and green diodepumped intracavity frequency doubling solid-state lasers. Fig.8 Configuration of a new digital photo printing system using blue and green diode-pumped intracavity frequency doubling solid-state lasers.

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