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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Two-dimensional single-shot measurement of angular dispersion for compressor alignment.

A Börzsönyi¹, L Mangin-Thro, G Cheriaux

¹Department of Optics and Quantum Electronics, University of Szeged, P.O. Box 406, Szeged H-6701, Hungary. badam@physx.u‑szeged.hu

|March 5, 2013

Summary

Misalignment in chirped pulse amplification (CPA) lasers distorts ultrashort pulses. We developed a simple, real-time 2D method for angular dispersion measurement, crucial for precise CPA laser compressor alignment and maximizing target intensity.

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Area of Science:

Optics and Photonics
Laser Physics
Ultrafast Science

Background:

Chirped Pulse Amplification (CPA) lasers are vital for generating high-intensity ultrashort pulses.
Misalignment in CPA stretcher-compressor stages degrades the spatiotemporal characteristics of these pulses.
Accurate alignment is critical for achieving maximum focused intensity on a target.

Purpose of the Study:

To introduce a straightforward technique for measuring angular dispersion in ultrashort laser pulses.
To enable real-time, single-shot, two-dimensional characterization of the entire beam profile.
To provide a method for precise alignment of CPA laser compressors.

Main Methods:

Development of a novel angular dispersion measurement technique.
Implementation of real-time, single-shot, 2D beam profiling.
Far-field measurement approach for enhanced alignment capabilities.

Main Results:

The developed technique provides accurate, real-time, 2D characterization of angular dispersion.
Pilot experiment accuracy approached the theoretical limit of 0.1 μrad/nm.
The method effectively addresses limitations of existing 1D, near-field techniques.

Conclusions:

The demonstrated technique offers a simple and effective solution for angular dispersion measurement.
This method significantly aids in the precise alignment of CPA laser compressors.
Accurate compressor alignment ensures optimal focusing and maximum intensity delivery to the target.