Ultrawide-range four-wave mixing in Raman distributed-feedback fiber lasers
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Updated: May 13, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
Jindan Shi1, Shaif-ul Alam, Morten Ibsen
1Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, UK. jxs@orc.soton.ac.uk
Abstract:
We report ultrawide-range and highly efficient wavelength conversion by exploiting four-wave mixing (FWM) in Raman distributed-feedback (R-DFB) fiber lasers. The lasers are 30 cm long center π phase-shifted DFB gratings UV written in commercially available germano-silica (Ge/Si) single-mode fibers (PS980 from Fibercore Ltd., and UHNA4 from Nufern). The R-DFB lasing signal acts as a pump wave for the FWM process within the DFB cavity, and the obtained FWM conversion efficiency is around -25 dB with a maximum wavelength conversion range of 112 nm.
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