CC BY
19LS-O-6
307 W high power 1018 nm monolithic tandem pump fiber source with effective thermal management
XChm1, Y. Yang1, B. He1
1Shanghai Institute of Optics and Fine Mechanics- Chinese Academy of Sciences,
Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Research Center of
Space Laser Information Technology, Shanghai, China
High power fiber lasers or amplifiers have attracted a lot of attention due to their outstanding characteristics, such as excellent beam quality, high efficiency, power scalability, and available high-power pumps [1-4]. Recent years, with the introduction of tandem-pumping technique, the ytterbium-doped fiber lasers (YDFLs) open up a new insight in available output laser power. Though the YDFLs have shown 5~6 orders of magnitude brightness enhancement by using tandem pump laser sources compared to that of the diode pump sources [1, 5-6], presenting compact high power tandem-pumping laser sources with high brightness is still challenging. Here, we report a monolithic 1018 nm fiber laser with total output power of 307 W, much higher than the reported tandem-pumping laser powers. The laser system is well designed to be suitable for an YDFL core-pumping setup. The cavity slope efficiency is up to 75.9% and the amplified spontaneous emission is suppressed by 54 dB. The measured beam quality has a M2 factor of 1.17. Heat dissipation of the key components is taken into account to achieve a stable laser operation. The power fluctuation is measured to be less than 0.8% of the maximum power during a measurement time of half an hour. This architecture can be an effective high brightness pump source of core-pumping high power fiber amplifiers.
References
[1] Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, "Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power," Opt. Express 12(25), 6088-6092(2004).
[2] V. Gapontsev, D. Gapontsev, N. Platonov, O. Shkurkhin, V. Fomin, A. Mashkin, M. Abramov, and S. Ferin, "2 kW CW ytterbium fiber laser with record diffraction limited brightness," in Proceedings of the Conference on Lasers and Electro-Optics Europe, (Optical Society of America, 2005).
[3] B. He, J. Zhou, Q. Lou, Y. Xue, Z. Li, W. Wang, J. Dong, Y. Wei, and W. Chen, "1.75 killowatt continuous-wave output fiber laser using homemade ytterbium-doped large-core fiber," Microw. Opt. Technol. Lett. 52(7), 1668-1671 (2010).
[4] B. Y. Zhao, K. L. Duan, W. Zhao, C. Li, and Y. S. Wang, "Experimental study on high power all-fiber laser," Chin. Opt. Lett. 8(4), 404-406 (2010).
[5] Y. Jeong, A. J. Boyland, J. K. Sahu, S. Chung, J. Nilsson, and D. N. Payne, "Multi-kilowatt singlemode ytterbium-doped large-core fiber laser," J. Opt. Soc. Korea 13(4), 416-422 (2009).
[6] J. Nilsson, "Recent progress and limiting factors in high power fiber laser technology," in Proceedings of the Conference on Lasers and Electro-Optics, 2010 OSA Technical Digest Series (Optical Society of America, 2010), tutorial paper CTuC1.
