Prepulse-free, multi-terawatt, sub-30-fs laser system

Area of Science:

• Laser Physics and Photonics
• Ultrafast Optics
• High-Intensity Laser Systems

Background:

• Ultrashort pulse lasers are crucial for various scientific fields.
• Achieving high prepulse contrast is a persistent challenge in laser technology.
• Existing methods often struggle to suppress unwanted prepulses effectively.

Purpose of the Study:

• To develop a prepulse-free, multi-terawatt ultrashort pulse laser system.
• To significantly enhance the prepulse contrast of amplified laser pulses.
• To achieve high energy and ultrashort pulse durations with improved contrast.

Main Methods:

• Integration of optical parametric chirped pulse amplification (OPCPA) with a conventional Ti:sapphire chirped pulse amplification laser chain.
• Utilizing an OPCPA system after a regenerative amplifier to boost prepulse contrast.
• Employing a subsequent four-pass Ti:sapphire amplifier for further energy amplification.

Main Results:

• Achieved a dramatic enhancement in prepulse contrast by 6 orders of magnitude.
• Measured a prepulse contrast better than 4.4 x 10^-11 for a 24 mJ pulse.
• Obtained a final amplified energy of 279 mJ with a 23.5 fs pulse duration, reaching 5.9 TW peak power.

Conclusions:

• The combined OPCPA and Ti:sapphire system effectively suppresses prepulses.
• This laser system offers superior prepulse contrast for high-energy ultrashort pulses.
• The developed technology advances capabilities for demanding applications in ultrafast science.