Self-compression of millijoule 1.5 microm pulses

Area of Science:

• Laser Physics
• Nonlinear Optics
• Ultrafast Science

Background:

• Advanced laser systems are crucial for scientific research, requiring high-energy, ultrashort pulses.
• Optical parametric amplification (OPA) is a key technique for generating tunable laser pulses.

Purpose of the Study:

• To demonstrate a novel four-stage optical parametric chirped-pulse amplification (OPCPA) system.
• To achieve carrier-envelope phase-stable, high-energy, and ultrashort infrared pulses.
• To explore pathways toward terawatt-peak-power single-cycle infrared sources.

Main Methods:

• Utilized a four-stage OPCPA system.
• Integrated femtosecond diode-pumped solid-state Ytterbium (Yb) technology with a picosecond 100 mJ Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) pump laser.
• Employed self-compression in argon for pulse duration reduction.

Main Results:

• Delivered carrier-envelope phase-stable approximately 1.5 micrometer pulses with energies up to 12.5 mJ before recompression.
• Achieved pulse recompression to a 74.4 fs duration with a 62 nm bandwidth, near the transform limit.
• Demonstrated self-compression of 2.2 mJ pulses down to 19.8 fs in argon, with 1.5 mJ output energy and 66% throughput.

Conclusions:

• The developed four-stage OPCPA system is effective for generating high-energy, phase-stable infrared pulses.
• The system shows promise for developing terawatt-peak-power single-cycle infrared sources.
• Self-compression in argon is a viable method for achieving few-cycle pulse durations from this system.