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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Published on: August 12, 2013

Large-mode enhancement cavities.

Henning Carstens1, Simon Holzberger, Jan Kaster

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str 1, 85748 Garching, Germany.

Optics Express
|May 15, 2013
PubMed
Summary
This summary is machine-generated.

Robust optical resonators with large spot sizes minimize mirror damage, enabling higher power levels in laser enhancement cavities. A bow-tie design offers superior stability and power enhancement.

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Area of Science:

  • Optics
  • Laser Physics
  • Optical Engineering

Background:

  • Passive enhancement cavities are limited by mirror damage at high power levels.
  • Reducing laser intensity and thermal gradients on mirror surfaces is crucial for mitigating damage.
  • Large spot sizes on mirrors are key to decreasing intensity and thermal gradients.

Purpose of the Study:

  • To design robust optical resonators with large spot sizes for enhanced laser power.
  • To identify resonator configurations that minimize mirror damage and maximize power enhancement.
  • To evaluate resonator robustness using a novel misalignment sensitivity metric.

Main Methods:

  • Investigated resonator designs focusing on large spot sizes and stability.
  • Introduced and utilized a misalignment sensitivity metric for robustness evaluation.
  • Implemented a bow-tie resonator configuration with specific mirror parameters and cavity length.

Main Results:

  • Identified the bow-tie resonator near the inner stability edge as the most robust large-mode cavity.
  • Achieved a stable power enhancement of near-infrared laser light by a factor of 2000.
  • Obtained large beam radii (5.7 mm sagittal, 2.6 mm tangential) on all mirrors.

Conclusions:

  • The implemented bow-tie resonator design effectively mitigates mirror damage by increasing spot sizes.
  • The findings enable significant increases in attainable power and intensity levels in enhancement cavities.
  • Proposed an all-reflective ellipticity compensation scheme to further enhance performance.