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21 November 2014 5W intracavity frequency-doubled green laser for laser projection
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High power green laser has many applications such as high brightness laser projection and large screen laser theater. A compact and high power green-light source has been developed in diode-pumped solid-state laser based on MgO doped periodically poled LiNbO3 (MgO:PPLN). 5W fiber coupled green laser is achieved by dual path Nd:YVO4/MgO:PPLN intra-cacity frequency-doubled. Single green laser maximum power 2.8W at 532nm is obtained by a 5.5W LD pumped, MgO:PPLN dimensions is 5mm(width)×1mm(thickness)×2mm(length), and the optical to optical conversion efficiency is 51%. The second LD series connected with the one LD, the second path green laser is obtained using the same method. Then the second path light overlap with the first path by the reflection mirrors, then couple into the fiber with a focus mirror. Dual of LD, Nd:YVO4, MgO:PPLN are placed on the same heat sink using a TEC cooling, the operating temperature bandwidth is about 12°C and the stablity is 5% in 96h. A 50×50×17mm3 laser module which generated continuous-wave 5 W green light with high efficiency and width temperature range is demonstrated.
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Boxia Yan, Yong Bi, Shu Li, Dongdong Wang, Dongzhou Wang, Yan Qi, and Tao Fang "5W intracavity frequency-doubled green laser for laser projection", Proc. SPIE 9296, International Symposium on Optoelectronic Technology and Application 2014: Advanced Display Technology; Nonimaging Optics: Efficient Design for Illumination and Solar Concentration, 92960M (21 November 2014);

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