Intracavity stretcher for chirped-pulse amplification in high-power laser systems

Area of Science:

• Optics and Photonics
• High-Energy Laser Systems
• Ultrafast Lasers

Background:

• High-energy, short-pulse laser systems are crucial for various scientific applications.
• Efficient pulse stretching and amplification are key challenges in these systems.
• Improving temporal intensity contrast is essential for advanced laser applications.

Purpose of the Study:

• To introduce and evaluate an intracavity Offner-type pulse stretcher for high-energy laser systems.
• To demonstrate tunable pulse stretching and amplification capabilities.
• To investigate the impact on temporal intensity contrast and compare it with previous methods.

Main Methods:

• Implementation of an Offner-type pulse stretcher within a high-energy, short-pulse laser system.
• Tunable stretching of laser pulses to several nanoseconds.
• Amplification of stretched pulses to 100 μJ.
• Further amplification and recompression using the Polaris high-power laser system.
• Characterization of temporal intensity contrast.

Main Results:

• Successful demonstration of pulse stretching to several nanoseconds with a tunable factor.
• Achieved pulse amplification to 100 μJ.
• Recompression to durations as short as 102 fs, yielding peak powers of 100 TW.
• Investigation and comparison of temporal intensity contrast with a previous setup.

Conclusions:

• The intracavity Offner-type pulse stretcher is an effective component for high-energy, short-pulse laser systems.
• The system demonstrates tunable pulse stretching, amplification, and high peak power generation.
• The new stretcher setup shows potential for improved temporal intensity contrast.