Dynamic characteristics analysis and realization of a high-repetition, high-energy, and high-power thin disk regenerative amplifier

Area of Science:

• Laser Physics
• Optical Engineering

Background:

• Regenerative amplifiers (RAs) are crucial for high-power laser systems.
• Optimizing RA parameters is essential for maximizing pulse energy and conversion efficiency.

Purpose of the Study:

• To conduct a comprehensive theoretical and numerical analysis of a thin disk regenerative amplifier (RA).
• To determine optimal operational parameters for maximizing pulse energy and conversion efficiency.
• To experimentally validate theoretical predictions and demonstrate RA performance.

Main Methods:

• Utilized Frantz-Nodvik equations for theoretical and numerical analysis.
• Developed a stable, double-pass thin disk RA with a Fourier transform resonator.
• Conducted systematic experimental validation of RA output characteristics.

Main Results:

• Achieved 205.2 W average output power, 10.25 mJ pulse energy, and 66.4% optical-to-optical efficiency at 20 kHz repetition frequency.
• Demonstrated a pulse width of 100 ps (10.25 mJ) and 3.5 ps after compression.
• Obtained excellent beam quality with M² factors of 1.07 and 1.09.

Conclusions:

• The theoretical analysis and experimental results provide a method for optimizing RA parameters.
• The developed RA design supports high-repetition, high-energy, and high-power laser research.
• Findings validate Frantz-Nodvik equation predictions for RA dynamics and energy extraction.