Raman-Accelerated Power Depletion of Fundamental Mode in a Few-Mode Fiber in the Visible Spectral Range

2025/10/16 by Wasyhun A. Gemechu, Guohao Fu, Gemechu, Wasyhun A. +3
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #FOS: Physical sciences #Laser-Matter Interactions and Applications #Optics (physics.optics) #Photonic Crystal and Fiber Optics

paper · doi:10.48550/arxiv.2510.14782

openalex publication_date 2025/10/16 · openalex created_date 2025/10/18 · openalex updated_date 2026/07/28

Abstract

mode. This process modifies the initial modal fractions and ultimately yields an intensity-null profile from a superposition of degenerate modes. Notably, simulations indicate that purely Kerr-driven thermalization models fail to capture these effects. Instead, phase-insensitive intermodal Raman scattering acts as a crucial seed, with differential Raman gain modulating a Kerr-Raman instability that drives spatiotemporal energy dynamics, altering our understanding of spatial self-organization in high-power fiber systems.

Citations

• Inter-Modal Raman Amplification in Space-division Multiplexed Systems
• Few-Mode Optical Fibers: Original Motivation and Recent Progress

Related

• Femtosecond nonlinear losses in multimode optical fibers
• Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion
• Scaling of nonlinear dynamics driven by stimulated Raman scattering in gas-filled hollow-core fibers
• Spatiotemporal mode decomposition of ultrashort pulses propagating in graded-index multimode fibers
• Spatiotemporal evolutions of similariton pulses in multimode fibers with Raman amplification