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Updated: Aug 17, 2026

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering
Published on: July 6, 2019
Observation of a transition from fluid to kinetic nonlinearities for langmuir waves driven by stimulated Raman
J L Kline1, D S Montgomery, B Bezzerides
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Abstract:
Thomson scattering is used to measure Langmuir waves (LW) driven by stimulated Raman scattering (SRS) in a diffraction limited laser focal spot. For SRS at wave numbers klambda(D) less similar 0.29, where k is the LW number and lambda(D) is the Debye length, multiple waves are detected and are attributed to the Langmuir decay instability (LDI) driven by the primary LW. At klambda(D) greater similar 0.29, a single wave, frequency-broadened spectrum is observed. The transition from the fluid to the kinetic regime is qualitatively consistent with particle-in-cell simulations and crossing of the LDI amplitude threshold above that for LW self-focusing.
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