Abstract
We demonstrate a cladding-pumped Raman fiber amplifier (CPRFA) whose brightness-enhancement factor depends on the cladding-to-core diameter ratio. The pump and the signal are coupled independently into different input arms of a pump–signal combiner, and the output is spliced to the Raman amplifier fiber. The CPRFA generates , pulses at at a repetition rate with ( peak power) of input pump energy. The amplified signal’s peak power is , and the brightness-enhancement factor is 192—the highest peak power and brightness enhancement achieved in a CPRFA at any wavelength, to our knowledge.
© 2009 Optical Society of America
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