Wavefront-corrected post-compression of a 100-TW Ti:sapphire laser

Area of Science:

• High-intensity laser physics
• Nonlinear optics
• Adaptive optics

Background:

• High-power lasers, such as Ti:Sapphire systems, are crucial for scientific research.
• Pulse post-compression techniques can increase laser peak power but induce wavefront distortions.
• Wavefront aberrations limit the focused intensity and degrade beam quality.

Purpose of the Study:

• To analyze and correct wavefront distortions in a post-compressed 100-TW Ti:Sapphire laser.
• To enhance the focused intensity and improve the beam quality of femtosecond laser pulses.
• To investigate the impact of nonlinear processes on wavefront aberrations during pulse compression.

Main Methods:

• Spectral broadening using three 0.5 mm fused silica plates.
• Pulse duration compression from 24 fs to 11 fs with chirped mirrors.
• Wavefront aberration measurement using a wavefront sensor.
• Correction of aberrations with an adaptive optics system.

Main Results:

• Wavefront aberrations were measured, caused by intensity-dependent nonlinear effects during post-compression.
• Adaptive optics correction improved the Strehl ratio from 0.37 to 0.52.
• Focused intensity enhancement factor increased from 1.1 to 1.5 after wavefront correction.
• Peak power was enhanced by a factor of 1.8, but wavefront correction was crucial for maximizing focused intensity.

Conclusions:

• Wavefront distortion significantly impacts the performance of post-compressed high-power lasers.
• Adaptive optics is an effective method for correcting these aberrations.
• Successful wavefront correction leads to a substantial enhancement in focused laser intensity and beam quality.