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A picosecond beam-timing system for the OMEGA laser.

W R Donaldson¹, J Katz¹, R Huff¹

¹Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.

The Review of Scientific Instruments

|June 3, 2016

Summary

A new timing system for the OMEGA Laser System ensures all 60 beams hit the target simultaneously. This precision timing system achieves a root mean square variability of just 4 picoseconds.

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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.