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15 February 2012 Low noise fiber laser based on gain feedback in a rare-earth doped fiber amplifier chain
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We demonstrate a low noise fiber laser (LN-FL) based on gain feedback controlled high efficiency fiber amplifier chain (FAC) which connect with other optical devices in a circle manner. The FAC contains two cascaded fiber amplifiers with core pumped and double-clad pumped Erbium and Erbium-Ytterbium co-doped fibers. Gain saturation effect and amplified spontaneous emission noise in the FAC is analyzed and suppressed through gain control method. Lasing mode in the LN-FL is stabilized with fiber pigtails setting in special orbits and ensuring fiber device splicing loss low without any filters. For continuous wave operation, mode-hopping free laser spectrum with output power of 2W and SNR of 50dB is achieved. The narrowest bandwidths are about 0.2nm and 0.01nm for lasing cavity without and with filters, respectively. Lasing wavelength can be tuned in a wavelength span of 7nm by adjusting of a fiber pigtailed polarization controller. Pulsed operation of the laser under different pump seeds injection is experimental investigated and analyzed.
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Hongdan Wan, Yue Gong, Xianqin Li, Jinlong Chen, Peichun Wu, and Xiaohan Sun "Low noise fiber laser based on gain feedback in a rare-earth doped fiber amplifier chain", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 823721 (15 February 2012);

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