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Optica Publishing Group
  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CJ_P_24

Active Q-switching in Raman fiber laser with random distributed feedback

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Abstract

Raman fiber lasers (RFLs), see e.g. [1], are featured by a broad-range wavelength tuning within the Raman gain spectrum of fibers, high efficiency of conversion of pump to Stokes wave of the first and higher orders, all-fiber design with high stability and reliability that is useful in various applications. Conventional RFLs operate in continuous-wave (CW) mode, but pulsed operation (that is often required in medicine) is also possible being usually achieved by pulsed pumping, see e.g. [2, 3]. Combined effect of Brillouin and Rayleigh back scattering (RS) has been also explored as a nonlinear passive self-Q-switching mechanism in fiber lasers [4, 5], but pulsed operation in this case is characterized by unstable repetition rates, amplitudes, and pulse widths. Later on, stable continuous action exploiting pure RS-based feedback has been achieved in a long cavity-free RFL [6]. Here we explore an opportunity of active Q-switching in the scheme of RFL with RS-based random distributed feedback.

© 2015 IEEE

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