Adaptive-feedback spectral-phase control for interactions with transform-limited ultrashort high-power laser pulses

Area of Science:

• High-intensity laser physics
• Plasma physics
• Particle acceleration

Background:

• Achieving Fourier-transform-limited light pulses is critical for high-power laser applications.
• Dispersion mismatch in laser systems causes spectral-phase distortion, degrading pulse quality.
• Accurate control over laser pulse characteristics is essential for advanced experiments.

Purpose of the Study:

• To compensate for spectral-phase distortion in a 100-TW laser system.
• To enhance the coherent temporal contrast of ultrashort laser pulses.
• To investigate the impact of spectral phase on laser wakefield acceleration.

Main Methods:

• Utilized an adaptive closed-loop system for spectral-phase compensation.
• Generated Fourier-transform-limited light pulses at the laser-plasma interaction point.
• Employed a 100-TW peak-power laser system in vacuum.

Main Results:

• Fully compensated spectral-phase distortion caused by dispersive elements.
• Achieved a two-orders-of-magnitude improvement in coherent temporal contrast on a sub-picosecond timescale.
• Demonstrated the capability for experimental studies linking laser wakefield acceleration to spectral phase.

Conclusions:

• Adaptive closed-loop control effectively corrects spectral-phase distortions in high-power lasers.
• Enhanced temporal contrast is vital for precise control and study of laser-driven plasma phenomena.
• This technique opens new avenues for optimizing laser wakefield acceleration.