Super-resonant four-photon collinear laser frequency multiplication in plasma

Area of Science:

• Plasma Physics
• Nonlinear Optics
• Laser Technology

Background:

• Intense laser pulses can undergo resonant four-photon scattering, nearly doubling their frequency in plasma.
• Transverse slippage between pulses is a significant technological hurdle for this process.
• Collinear four-photon scattering is typically forbidden due to classical light dispersion in plasma.

Purpose of the Study:

• To investigate methods for achieving collinear four-photon resonance for laser frequency doubling in plasma.
• To overcome the limitations of transverse slippage and intensity sensitivity in nonlinear optical processes.
• To enable efficient all-optical frequency doubling of mildly relativistic-intense laser pulses.

Main Methods:

• Exploration of nonlinear renormalization effects on intense laser pulses in plasma.
• Identification of a lower-dimensionality submanifold within the resonant four-photon manifold.
• Analysis of pulse evolution dynamics under specific resonance conditions.

Main Results:

• Nonlinear renormalization enables collinear four-photon resonance, overcoming classical dispersion limitations.
• A specific submanifold allows evolving pulses to maintain resonance, mitigating intensity sensitivity.
• This resonance facilitates all-optical frequency doubling in a collinear geometry.

Conclusions:

• A novel pathway for all-optical frequency doubling of laser pulses in plasma has been identified.
• The discovered resonance submanifold overcomes previous technological challenges like transverse slippage.
• This advancement offers a promising method for efficient laser frequency multiplication in collinear configurations.