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Updated: Mar 21, 2026
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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
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Competition of stimulated Raman scattering modes in multibeam configuration.
Zhuwen Lin1, Yao Zhao1, Hongwei Yin1
1Sun Yat-sen University, School of Science, Shenzhen Campus of , Shenzhen 518107, China.
Physical Review. E
|March 20, 2026
Summary
In multibeam configurations, the shared common electrostatic (SCE) wave enhances hot-electron generation via stimulated Raman scattering (SRS). However, frequency differences between beams suppress SCE, favoring single-beam SRS and reducing hot electrons.
Area of Science:
- Plasma Physics
- Laser-Plasma Interactions
- High-Energy-Density Physics
Background:
- Stimulated Raman scattering (SRS) is a key process in laser-plasma interactions.
- Understanding competing SRS modes is crucial for controlling energy transfer and particle acceleration.
- Multibeam laser configurations introduce complex interactions affecting SRS dynamics.
Purpose of the Study:
- Investigate the competition between collective modes and single-beam SRS (SSRS) in multibeam SRS.
- Analyze the excitation and dominance of the shared common electrostatic (SCE) wave.
- Determine factors influencing hot-electron generation and suppression.
Main Methods:
- Theoretical analysis of wave interactions in multibeam configurations.
- Particle-in-cell simulations to model SRS phenomena.
- Examination of parameters like crossing angle, speckle, frequency differences, and plasma density.
Main Results:
- The shared common electrostatic (SCE) mode dominates when the laser crossing angle is below a critical angle, leading to significant hot-electron generation.
- Speckle in laser beams enhances SCE and hot-electron production compared to plane waves.
- A 0.5% frequency difference between incident beams mitigates SCE, favoring SSRS and suppressing hot electrons; SSRS dominates at larger crossing angles or high intensities.
Conclusions:
- The SCE mode is a significant pathway for hot-electron generation in multibeam SRS under specific conditions.
- Controlling laser parameters, such as frequency differences and crossing angles, can suppress SCE and hot-electron generation.
- SSRS becomes dominant in regimes with large crossing angles, high laser intensities, or when collective modes are mitigated.
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