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High reflection mirrors for pulse compression gratings.

S Palmier1, J Neauport, N Baclet

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Optics Express
|December 10, 2009
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Summary

Mixed Metal MultiLayer Dielectric (MMLD) mirrors offer high reflection for pulse compression gratings. These mirrors show damage performance similar to standard MultiLayer Dielectric (MLD) mirrors but with lower stresses, making them optimal for vacuum applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Technology

Background:

  • High reflection mirrors are crucial for fabricating gratings used in pulse compression applications.
  • Standard e-beam evaporated MultiLayer Dielectric (MLD) mirrors are commonly used, but their stress properties can be a limitation.
  • Mixed Metal MultiLayer Dielectric (MMLD) mirrors offer an alternative design combining metal and dielectric layers.

Purpose of the Study:

  • To experimentally investigate and compare the performance of MMLD and MLD mirrors for pulse compression gratings.
  • To evaluate the laser-induced damage threshold and stress characteristics of both mirror types.
  • To determine the optimal mirror substrate for pulse compression gratings operating under vacuum conditions.

Main Methods:

  • Fabrication of various MMLD and MLD mirror samples.
  • Laser-induced damage testing at a pulse duration of 500 femtoseconds (fs).
  • Post-damage analysis using Nomarski microscopy and white light interferometer microscopy.

Main Results:

  • MMLD mirrors demonstrated damage performances comparable to MLD mirrors.
  • MMLD mirrors exhibited significantly lower internal stresses compared to MLD mirrors.
  • Both mirror types were investigated for high reflection applications at a wavelength of 1.053 micrometers.

Conclusions:

  • MMLD mirrors are a viable alternative to MLD mirrors for pulse compression gratings.
  • The lower stress of MMLD mirrors makes them an optimal substrate choice for vacuum-based pulse compression applications.
  • Further research may explore optimizing MMLD designs for even higher damage thresholds.