Abstract

We report a tunable synchronously pumped fiber Raman laser (SPFRL) in the near-infrared (NIR) and visible wavebands pumped by a pulsed, all-fiber PM 1060nm master oscillator power amplifier (MOPA) and its frequency-doubled output, respectively. The seed was adaptively shaped to deliver rectangular output pulses, thereby enabling selective excitation of individual Raman Stokes lines. Using filtered synchronous feedback of the desired Raman Stokes line, the linewidth of the SPFRL was reduced by a factor of 4 and the extinction ratio of the desired Raman Stokes was improved by more than 3dB relative to a simple single-pass conversion scheme. A continuous tuning range of 2.2THz was obtained for each of the Raman Stokes orders in the visible (spanning from green to orange—first to fifth Stokes lines). A larger 5.0THz tunable range was achieved in the NIR spectral region.

© 2011 Optical Society of America

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