Laser Beam Testing

Introduction

COMPLETE LASER BEAM ANALYSIS | High resolution wavefront measurement


Based on a patented technology, Phasics wavefront sensor simultaneously provides both phase and intensity maps of unrivalled high resolution. It combines to the SID4 software to deliver a complete diagnostic of the laser beam: wavefront aberrations, laser beam parameters, beam profiles, M2 beam quality parameter… It is compact and it easily positions at any point of the laser chain as it directly measures diverging beam.

For

  • For high power laser engineer
    • Build and maintain your laser quality
    • Check your laser before an experiment
  • For laser manufacturers:
    • Fast & comprehensive beam quality control in R&D or production, including M2

For any laser

  • Continuous to pulsed lasers
  • UV to far IR , including broadband lasers such as OPO laser, femtosecond laser

Achievements

FULL BEAM CHARACTERIZATION
With high resolution phase + intensity


  • Aberrations (Zernike, Legendre)
  • PSF, Strehl Ratio, Encircled energy
  • Beam profiles

Zernike coefficient measurement

M2 MEASUREMENT
in compliance to ISO 11146 standard


  • in a single shot
  • for any laser including femtosecond laser

Beam quality and beam propagation

 

VERSATILE TEST
at any point of the laser


  • compact and easy-to-align
  • diverging beam measurement with no relay lens
  • Beam profiles

diverging beam wavefront measurement

ADVANCED MEASUREMENT


  • Circular or rectangular pupils
  • Multiple pupils
  • Piston
  • Tilt…

Introduction

Phasics technology – “Quadriwave lateral shearing interferometry”- delivers the phase and intensity of an incident laser beam. Beam parameters including M2 and aberrations are calculated from this one shot acquisition.
 
Phasics technology stands out for its very high spatial resolution and its ability to measure diverging beam with no relay lens. Thus it provides very accurate outcomes and it is easy to integrate in any set-up.

 

Set Up

Wavefront sensor set-up for laser beam test

► Phasics solution for laser beam testing combines one of our high resolution wavefront sensor with the SID4 software package. This package manages acquisition and analysis of phase. Trigger is possible.

 

Phasics wavefront analyzer can be positionned at any point of the laser chain, whether the beam is collimated or diverging

Advantages

HIGH RESOLUTION
Up to 300 x 400 measurements points


  • For both phase & intensity
  • Robust calculations of beam parameters including the M2
  • Strong aberrations measurement

DIRECT MEASUREMENT
No relay lens


  • Easy positioning at any point of the laser chain
  • No extra aberrations (no relay lens)
  • No relay optics at high NA

ACHROMATIC
No calibration needed


  • Compatible with Femto second pulse
  • OPO laser
  • Several lasers management

SELF REFERENCED
No reference arm


  • Compact
  • Insensitive to vibrations

Comparisons to other techniques

Phasics Shack-Hartmann
High resolution ++ -
High dynamics ++ ++
Direct measurement Yes No
Easy alignment ++ +
Self-referenced Yes Yes
Achromatic Yes No

Scientific publications

Proc. SPIE 7751

DOI: 10.1117/12.880946

Off-axis negative-branch unstable resonator in rectangular geometry

XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 775115

Application Note

M2 measurement based on a one shot high resolution wavefront measurement

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