15 March 2013 Experimental and theoretical investigations of single-frequency Raman fiber amplifiers operating at 1178 nm
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Abstract
We present a detailed study of power scaling in polarization-maintaining Raman fiber amplifiers operating at 1178 nm since this wavelength can be frequency doubled into 589 nm for sodium guide star applications. We confirm experimentally that the optimized output signal at SBS threshold scales linearly with the pump power. We also present results from numerical and experimental studies investigating the scalability of Raman fiber amplifiers with seed power. Both co-pumped and counter pumped two-stage amplifiers utilizing acoustically tailored fiber for SBS suppression were constructed and studied. For the former configuration spectral broadening was observed, while the latter configuration provided 22 W of single-frequency output. Finally, we show results of a phase-modulated amplifier generating multiple spectral lines separated by 886 MHz, which corresponds to the spectral separation of the sodium D2a, and D2b lines after frequency doubling in a nonlinear cavity.
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Iyad Dajani, Iyad Dajani, Christopher Vergien, Christopher Vergien, Benjamin Ward, Benjamin Ward, Craig Robin, Craig Robin, Shadi Naderi, Shadi Naderi, Angel Flores, Angel Flores, Jean-Claude Diels, Jean-Claude Diels, } "Experimental and theoretical investigations of single-frequency Raman fiber amplifiers operating at 1178 nm ", Proc. SPIE 8604, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII, 86040N (15 March 2013); doi: 10.1117/12.2006946; https://doi.org/10.1117/12.2006946
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