Highly efficient double plasma mirror producing ultrahigh-contrast multi-petawatt laser pulses

Area of Science:

• High-intensity laser physics
• Nonlinear optics
• Plasma physics

Background:

• Achieving ultrahigh temporal contrast in multi-petawatt (PW) laser systems is crucial for advanced applications.
• Existing methods face limitations in contrast enhancement and maintaining pulse quality at PW scales.

Purpose of the Study:

• To present a highly efficient double plasma mirror (DPM) system for achieving ultrahigh temporal contrast in multi-PW laser pulses.
• To demonstrate the DPM's effectiveness in enhancing temporal contrast without compromising spatiotemporal laser profiles.

Main Methods:

• Implementation of a double plasma mirror (DPM) after the final amplification stage of a 4 PW Ti:sapphire laser.
• Utilizing cross-polarized wave generation and optical parametric chirped-pulse amplification for initial high-contrast generation.
• Optimizing DPM operating conditions to preserve laser pulse spatiotemporal characteristics.

Main Results:

• Achieved ultrahigh temporal contrast ratios of 10¹⁷ up to 160 ps and 10¹² up to 2 ps before the main pulse.
• Obtained high DPM reflectivity of 70% and a contrast enhancement factor of 700,000.
• Confirmed that DPM operation did not negatively impact the spatiotemporal profiles of the multi-PW laser pulses.

Conclusions:

• The developed DPM is a highly efficient and practical solution for achieving ultrahigh temporal contrast in multi-PW laser systems.
• The DPM's high performance and minimal impact on pulse quality pave the way for its use in next-generation tens of petawatt lasers.
• This advancement promises to enable new frontiers in high-energy-density physics and other laser-driven applications.