Thin disk amplifier-based 40 mJ, 1 kHz, picosecond laser at 515 nm

Area of Science:

• Laser Physics
• Nonlinear Optics
• Materials Science

Background:

• Picosecond Yb:YAG thin disk regenerative amplifiers are crucial for high-power laser systems.
• Optical Parametric Amplifiers (OPCPA) require stable, high-energy pump lasers for efficient operation.
• Kilohertz repetition rates are desirable for many advanced laser applications.

Purpose of the Study:

• To develop a frequency-doubled picosecond Yb:YAG thin disk regenerative amplifier.
• To characterize its performance as a pump laser for kilohertz repetition rate OPCPA.
• To achieve high pulse energy and stability at 515 nm.

Main Methods:

• Utilized a Yb:YAG thin disk regenerative amplifier architecture.
• Compressed the amplified pulses to achieve picosecond duration.
• Employed frequency doubling in a Lithium Triborate (LBO) crystal.
• Operated the system at a 1 kHz repetition rate.

Main Results:

• Achieved a pulse duration of 1.2 ps at 1 kHz repetition rate.
• Obtained a pulse energy of 90 mJ with energy stability (σ) < 0.8%.
• Demonstrated excellent beam quality with M² < 1.2.
• Successfully frequency-doubled the pulses to 515 nm, yielding 42 mJ.

Conclusions:

• The developed Yb:YAG regenerative amplifier meets the stringent requirements for pumping kilohertz OPCPA systems.
• The system provides high pulse energy, excellent stability, and good beam quality.
• Frequency doubling to 515 nm offers a versatile wavelength for further nonlinear processes.