Research progress of ultra-wide-tuning and stochastic Raman lasers in China

Recently, the group headed by Feng Yan, a researcher at the Space Laser Information Technology Research Center of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, made new progresses in the research of stochastic Raman fiber lasers.

The picture shows the structure diagram of ultra-wide tuning and random Raman laser

In the study, an ultra-wide-tuning and stochastic Raman laser structure is proposed to achieve a 1-1.9μm tunable and tunable random Raman laser output. The maximum output power is 6.2W and the output wavelength is 1.82μm.

The picture shows a 1-1.9μm continuously tunable random Raman laser output spectrum

In 2010, Sergei K. Turitsyn et al. Reported a new type of laser (Nature Photonics 4, 231-235 (2010)) that provides Raman gain using standard single-mode fiber and provides distributed feedback via its back-to-Rayleigh scattering , Resulting in random laser output, and formally put forward the "random distributed feedback fiber laser" concept. Compared with the traditional lasers, the random lasers do not have the traditional resonant cavity, but utilize the Rayleigh scattering effect in the single-mode optical fiber to provide a new type of cavity-free lasers with random distribution feedback and superposition. Therefore, based on the random distribution feedback Raman fiber laser has the characteristics of simple structure, good directivity, continuous output stability and tunable wavelength. It has a wide range of potential applications in nonlinear optics, optical sensing and optical communication, biomedical imaging and remote sensing.

In this study, the researchers combined the tunable properties of a stochastic Raman laser with cascaded properties. By theoretical analysis and experimental studies, a stochastic Raman laser was pumped with a tunable ytterbium-doped fiber laser to achieve a ~ 50 nm tunable random Laser output, combined with cascaded Raman technology to obtain a wide band tunable random laser output. The initial demonstration experiment uses a standard single-mode fiber as the Raman gain fiber to obtain a 300 nm continuously tunable random Raman laser output (Opt. Lett. 41, 215 (2016)). Further tuning of the wavelength is limited to four waves Spectral broadening caused by mixing. By optimizing parameters such as dispersion, non-linearity coefficient and transmission loss of Raman gain fiber and improving the output power of tunable pump laser, a semi-open-cavity stochastic Raman laser was used to obtain a continuous tunable 1-1.9μm Of the random Raman laser output, the maximum output power of 6.2W, the corresponding output wavelength of 1.82μm, the results of the scientific report (Sci. Rep. 7, 42611 (2017)).

The research has been supported by the National Natural Science Foundation of China.

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