AI Article Synopsis
- All-fiber Raman lasers can efficiently convert multimode pump beams into high-quality Stokes beams, but the modes of these beams haven't been analyzed before.
- Using a mode decomposition technique, this study examines the interactions between different modes in multimode graded-index fiber Raman lasers across various operating conditions.
- Findings show that after reaching the laser threshold, the lower transverse modes of the pump beam are significantly reduced, while the generated Stokes beam primarily contains the fundamental mode, along with diminishing higher-order modes.
Article Abstract
All-fiber Raman lasers have demonstrated their potential for efficient conversion of highly multimode pump beams into high-quality Stokes beams. However, the modal content of these beams has not yet been investigated. In this work, based on a mode decomposition technique, we are able to reveal the details of intermodal interactions in the different operation regimes of continuous wave multimode graded-index fiber Raman lasers. We observed that, above the laser threshold, the residual pump beam is strongly depleted in its transverse modes with principal quantum number below 10. However, the generated Stokes signal beam mainly consists of the fundamental mode, but higher-order modes are also present, albeit with exponentially decreasing population.
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| http://dx.doi.org/10.1364/OL.449119 | DOI Listing |
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