Random distributed feedback fiber laser of ultimate efficiency

Vatnik, Ilya D.; Podivilov, E. V.; Babin, Sergey A.; Churkin, Dmitry V.

doi:10.1364/np.2014.nw4a.5

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…So, finding a balance between these factors will result in maximum efficiency at moderate pumping. Here we extend our preliminary results [14] obtained in a short-fiber (850 m) random DFB laser pumped by a ~10 W Yb-doped fiber laser, being focused on the details of pump-to-Stokes conversion and the role of RS-based feedback in such a short fiber.…”

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confidence: 55%

High-efficiency generation in a short random fiber laser

et al. 2014

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We demonstrate a high-efficiency random lasing in a 850-m span of a phosphosilicate fiber. Random distributed feedback owing to the Rayleigh backscattering in the fiber enables narrowband generation with the output power of up to 7.3 W at the Stokes wavelength λ S =1308 nm from 11 W of the pump power at λ P =1115 nm. The laser demonstrates unique generation efficiency. Near the generation threshold, more than 2 W of output power is generated from only 0.5W of pump power excess over the generation threshold. At high pump power, the quantum conversion efficiency defined as a ratio of generated and pump photons at the laser output exceeds 100%. It is explained by the fact that every pump photon is converted into the Stokes photon far from the output fiber end, while the Stokes photons have lower attenuation than the pump photons.

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confidence: 55%

High-efficiency generation in a short random fiber laser

et al. 2014

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“…Various aspects of RFL have been studied in recent years. RFL has demonstrated to be tunable [14], multi-wavelength [15][16][17][18], narrow bandwidth [19], cascaded operation to generate high order Stokes wave [20][21][22][23] and high output power [24,25].. However, up till now, there are still a lot of open questions regarding the physics of random lasing in fibers.…”

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confidence: 99%

Random distributed feedback Raman fiber laser with polarized pumping

Churkin

Vatnik

et al. 2014

Laser Phys. Lett.

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Abstract：In this paper, the polarization properties of random fiber laser operating via Raman gain and random distributed feedback owing to Rayleigh scattering is investigated for the first time. Using polarized pump, the partially polarized generation is obtained with a generation spectrum exhibiting descrete narrow spectral features contrary to the smooth spectrum observed for the unpolarized pump. The threshold, output power, degree of polarization (DOP) and the state of polarization (SOP) of the lasing can be significantly influenced by the SOP of the pump. Fine narrow spectral components are also sensitive to the SOP of the pump wave. Furthermore, we found that random lasing's longitudinal power distribution is different in the case of polarized and unpolarized pumpoing that results in considerable reduction of the generation slope efficiency for the polarized radiation. Our results indicates that polarization effects plays an important role in the performance of the random fiber laser. This work improves the understanding of the physics of random lasing in fibers and makes a step forward towards the establishment of the vector model of random fiber lasers.

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Random distributed feedback fiber laser of ultimate efficiency

Abstract: Abstract:We demonstrate a random fiber laser of ultimate efficiency. More than 2 Watts are generated from 0.5W of pump excess over the generation threshold. At higher power, an optical efficiency corresponds to the quantum limit.

Cited by 2 publications

References 7 publications

High-efficiency generation in a short random fiber laser

High-efficiency generation in a short random fiber laser

Random distributed feedback Raman fiber laser with polarized pumping

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