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17 February 2010 Experimental and theoretical studies of single frequency PCF amplifier with output of 400 W
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We report on experimental and theoretical investigations of single frequency high power PCF amplifiers. A model describing the interplay among laser gain, thermals effects, and SBS was developed to study the power limitations of single frequency amplifiers in general, and PCF amplifiers in particular. A distributed noise term was used to initiate the SBS process with the Stokes light spanning multi-frequency channels. The use of thermal and acoustic gradients in conjunction was considered and indicated marginal improvement. In the set of experiments, slope efficiencies as high as 77% were obtained with a maximum output of 427 W. The linewidth was measured and yielded values that were less than 10 KHz. A pump-probe measurement of the Brillouin gain spectrum revealed secondary peaks lying at the highfrequency side. Measurements conducted on a novel PCF, specifically designed to utilize thermal and acoustic gradients in conjunction, showed the existence of two primary gain peaks.
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Craig Robin, Iyad Dajani, Christopher Vergien, Clint Zeringue, and Thomas M. Shay "Experimental and theoretical studies of single frequency PCF amplifier with output of 400 W", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801I (17 February 2010);

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