2021/03/31 by Curtis R. Menyuk, Joshua T. Young, Menyuk, Curtis R. +9 · 1 citation
Chemistry · Engineering · Physics and Astronomy · #FOS: Physical sciences #Laser-Matter Interactions and Applications #Optics (physics.optics) #Solid State Laser Technologies #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.2103.17237
openalex publication_date 2021/03/31 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We study the transverse mode instability (TMI) in the limit where a single\nhigher-order mode (HOM) is present. We demonstrate that when the beat length\nbetween the fundamental mode and the HOM is small compared to the length scales\non which the pump amplitude and the optical mode amplitudes vary, TMI is a\nthree-wave mixing process in which the two optical modes beat with the\nphase-matched component of the index of refraction that is induced by the\nthermal grating. This limit is the usual limit in applications, and in this\nlimit TMI is identified as a stimulated thermal Rayleigh scattering (STRS)\nprocess. We demonstrate that a phase-matched model that is based on the\nthree-wave mixing equations can have a large computational advantage over\ncurrent coupled mode methods that must use longitudinal step sizes that are\nsmall compared to the beat length.\n