17 January 2007 High power LD-end-pumped Nd:YVO4 laser as a pump source for Raman fiber laser
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Proceedings Volume 6279, 27th International Congress on High-Speed Photography and Photonics; 62796C (2007) https://doi.org/10.1117/12.725738
Event: 27th International congress on High-Speed Photography and Photonics, 2006, Xi'an, China
Abstract
A LD-single-end-pumped Nd:YVO4 CW all-solid-state laser with maximum output power 12.5W at 1064nm was designed to pump the cascaded phosphosilicate fiber Raman laser. The Nd:YVO4 laser is lower in cost than Yb-doped cladding fiber laser which is usually used as a pump for Raman fiber laser. However, it is inefficient to couple pump beam into single mode fiber (SMF). The coupling efficiency from pump beam to SMF is largely affected by the beam quality. Thus, a high coupling efficiency requires maintaining laser's operation in the TEM00 mode while scaling the power. The beam quality and maximum output power of the Nd:YVO4 laser is restricted by the thermal lens and fracture within the gain medium under high pump intensity conditions. The thermal effects was decreased by using a 3×3× 10mm3 Nd:YVO4 crystal with a low neodymium-doped concentration (0.3at%). Furthermore, a plane-plane resonant cavity with large mode volume and a large pump size was also used to reduce the effects. The Nd:YVO4 laser with maximum output power 12.5W and M2<1.2 was obtained. More power than 4W was injected into cascaded Raman cavity at the maximum pump power and about 1W coherent second-order Stokes radiation at 1484nm was achieved.
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Chaohong Huang, Chaohong Huang, Wencai Huang, Wencai Huang, Zhengqian Luo, Zhengqian Luo, Guoyong Sun, Guoyong Sun, Zhiping Cai, Zhiping Cai, } "High power LD-end-pumped Nd:YVO4 laser as a pump source for Raman fiber laser", Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62796C (17 January 2007); doi: 10.1117/12.725738; https://doi.org/10.1117/12.725738
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