A picosecond beam-timing system for the OMEGA laser

Area of Science:

• Laser Physics
• Optical Engineering
• High-Energy Physics

Background:

• Precise temporal alignment of multiple laser beams is critical for experiments in inertial confinement fusion and high-energy-density physics.
• Existing timing systems face challenges in achieving sub-5-picosecond accuracy for large laser facilities.

Purpose of the Study:

• To demonstrate a novel timing system for the OMEGA Laser System capable of synchronizing 60 laser beams to within a 4 picosecond root mean square (ps-rms) variability.
• To provide a robust and accurate method for ensuring simultaneous beam arrival at the target position.

Main Methods:

• The system utilizes a scattering sphere placed at the target's focal point.
• Light from each of the 60 OMEGA laser beams is coupled into the scattering sphere.
• A single photodetector measures the arrival time of the light pulses from all beams.

Main Results:

• The demonstrated timing system successfully synchronized all 60 beams to arrive on target simultaneously.
• The achieved root mean square (RMS) timing variability was measured to be 4 picoseconds.
• This represents a significant improvement in temporal precision for the OMEGA Laser System.

Conclusions:

• The scattering sphere-based timing system provides a highly accurate and reliable method for achieving simultaneous beam arrival in large laser facilities.
• This advancement in laser synchronization is crucial for optimizing experimental outcomes in fusion energy research and related fields.
• The demonstrated system offers a practical solution for enhancing the performance of existing and future laser-based research platforms.