High power LD-end-pumped Nd:YVO4 laser as a pump source for Raman fiber laser

Chaohong Huang; Wencai Huang; Zhengqian Luo; Guoyong Sun; Zhiping Cai

doi:10.1117/12.725738

17 January 2007 High power LD-end-pumped Nd:YVO₄ laser as a pump source for Raman fiber laser

Chaohong Huang, Wencai Huang, Zhengqian Luo, Guoyong Sun, Zhiping Cai

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.

Citation Download Citation

Chaohong Huang, Wencai Huang, Zhengqian Luo, Guoyong Sun, and 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); https://doi.org/10.1117/12.725738

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KEYWORDS

Fiber lasers

Raman spectroscopy

Quantum cascade lasers

Laser crystals

Single mode fibers

Semiconductor lasers

Thermal effects

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