Abstract
We demonstrate a CW random distributed feedback Raman fiber laser operating in a 1.2 μm spectral band. The laser generates up to 3.8 W of the quasi-CW radiation at 1175 nm with the narrow spectrum of 1 nm. Conversion efficiency reaches 60%. Up to 1 W is generated at the second Stokes wavelength of 1242 nm. It is shown that the generation spectrum of RDFB Raman fiber laser is much narrower than the spectrum in the system without a weak random feedback.
Highlights
In recent decades there has been a great deal of interest in light generation using irregular feedback
The output characteristics of random lasers are determined by the build-up of the radiation during multiple scattering processes resulting in randomly embedded local spatial generation modes [3,4]
In this paper we demonstrate the Raman fiber laser with random distributed feedback via Rayleigh scattering operating in a 1.2 μm spectral band
Summary
In recent decades there has been a great deal of interest in light generation using irregular feedback This concept is exploited in random lasers based on active media without any regular optical cavity (see review papers [1,2] and references therein). A directional pulsed random lasing has been demonstrated in the short 4 mm photonic crystal fiber with a hollow core filled with a suspension of TiO2 nanoparticles in a Rhodamin 6G dye solution [5]. In this way, the fiber waveguide properties are combined with traditional bulk random material (amplifying dye with randomly scattering nanoparticles) providing one dimensional random lasing. The Er-doped fiber random laser based on the continuous grating with randomly distributed phase errors has been reported in [7]
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