Abstract
An up to 8th order cascaded Raman random fiber laser with high spectral purity is achieved with the pumping of a narrow linewidth amplified spontaneous emission source. The spectral purity is over 90% for all the 8 Stokes orders. The highest output power is 6.9 W at 1691.6 nm with an optical conversion efficiency of 21% from 1062.0 nm. As a comparison, with conventional FBG-based fiber oscillator as pump source, only 47% spectral purity is achieved at 8th order. The temporal stability of the pump laser is proved to play a key role, because the time fluctuation of pump laser is transferred directly to Raman outputs and results in power distribution among different Stokes orders.
Highlights
Random Raman fiber lasers (RRFLs) have received significant attention since its first demonstration in 2010 [1]
As compared to the point-like feedback in traditional fiber lasers, the necessary feedback of RRFLs is based on the distributed Rayleigh scattering inside the optical fiber
The results prove that ASE pumping is an effective way to improve the output performance of high order cascaded Raman fiber lasers
Summary
Random Raman fiber lasers (RRFLs) have received significant attention since its first demonstration in 2010 [1]. As compared to the point-like feedback in traditional fiber lasers, the necessary feedback of RRFLs is based on the distributed Rayleigh scattering inside the optical fiber. Because of the Raman gain and Rayleigh scattering based feedback, RRFLs are wavelength versatile and can lase at arbitrary wavelength across the transparency window of an optical fiber. Zhang et al demonstrated a 900 nm nearly-octave wavelength tunable random laser with up to the 10th order cascaded Raman scattering [14]. Lobach et al demonstrated a cascaded linearly polarized RRFL based on phosphosilicate fiber, getting 8 W output at 1262 nm and 9 W output at 1515 nm [15]. Cascaded RRFL is an effective approach to generate stable laser beyond rare earth emission bands
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