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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Published on: January 28, 2019

Phasing rectangular apertures.

K L Baker1, D Homoelle, E Utterback

  • 1Lawrence Livermore National Laboratory, Livermore, CA, USA. Baker7@llnl.gov

Optics Express
|December 10, 2009
PubMed
Summary
This summary is machine-generated.

This study presents analytic methods for phasing multiple laser beams, crucial for fast ignition fusion. Experiments validated these techniques, achieving precise beam phasing with minimal variance.

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

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Published on: April 1, 2020

Area of Science:

  • Optical Engineering
  • Laser Physics
  • Fusion Energy

Background:

  • Aperture phasing is critical for optical systems, particularly in astronomical telescopes with segmented mirrors.
  • Phasing multiple apertures is essential across various optical applications, including laser fusion.

Purpose of the Study:

  • To derive analytic expressions for phasing multiple short pulse laser beams for fast ignition fusion.
  • To compare analytic predictions with experimental measurements for validating phasing techniques.

Main Methods:

  • Derivation of analytic expressions for far-field distribution, enclosed energy, and center-of-mass for two rectangular apertures.
  • Experimental simulation using a Micro-Electro-Mechanical Systems (MEMS) device to represent two apertures.
  • Comparison of analytic parameters with data derived from experimental measurements.

Main Results:

  • Analytic expressions were developed for key phasing parameters.
  • Experimental validation demonstrated the effectiveness of the derived analytic methods.
  • Two methods, far-field distribution fitting and ensquared energy measurement, yielded phase variance < 0.005 rad(2).

Conclusions:

  • The developed analytic techniques accurately predict and enable precise phasing of multiple laser beams.
  • Experimental results confirm the efficacy of these methods for applications like fast ignition fusion.
  • Achieved RMS displacement of less than 12 nm highlights the high precision of the phasing methods.