Control of the optical Kerr effect in chirped-pulse-amplification systems using model-based phase shaping

Area of Science:

• Physics
• Optical Engineering
• Laser Science

Background:

• The Kerr effect, specifically self-phase modulation, significantly impacts pulse quality in fiber-based chirped-pulse amplification (CPA) systems.
• Managing spectral phase distortions is crucial for achieving high-energy, transform-limited pulses in CPA.

Purpose of the Study:

• To experimentally control the impact of the Kerr effect in a fiber CPA system.
• To develop a method for managing spectral phase without complex measurements or optimization.

Main Methods:

• Utilizing phase shaping based on an analytical model of spectral phase in CPA systems.
• Implementing a technique that avoids intricate phase measurements and lengthy optimization procedures.

Main Results:

• Achieved nearly transform-limited pulses with energies up to 1 mJ.
• Successfully accumulated a B integral of 8 rad in the main amplifier.
• The method intrinsically determines the accumulated B integral value.

Conclusions:

• Phase shaping offers an effective means to control Kerr nonlinearity in fiber CPA.
• The developed technique provides a straightforward approach to pulse optimization in high-energy systems.
• This method enables precise control over pulse characteristics and nonlinear effects.