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Off-axis negative-branch unstable resonator in rectangular geometry.

Carsten Pargmann1, Thomas Hall, Frank Duschek

  • 1German Aerospace Center (DLR), Institute of Technical Physics, Langer Grund, D-74239 Hardthausen, Germany. carsten.pargmann@dlr.de

Applied Optics
|January 12, 2011
PubMed
Summary
This summary is machine-generated.

This study explores off-axis unstable resonators for rectangular lasers. The L-shaped scraper design offers higher output power by fully covering the gain medium, despite slightly increased beam divergence.

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Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Unstable resonators are crucial for high-power lasers.
  • Adapting resonators to rectangular active media presents geometric challenges.
  • Off-axis configurations can mitigate mode degeneracy and improve beam quality.

Purpose of the Study:

  • To investigate the performance of an off-axis negative-branch unstable resonator with a rectangular active medium.
  • To compare two scraper mirror configurations ([ and L-shaped) for optimizing laser output.
  • To analyze the impact of scraper geometry on beam characteristics and power coupling.

Main Methods:

  • Numerical simulations and experimental validation using a multikilowatt chemical oxygen iodine laser.
  • Implementation of spherical mirrors and two distinct scraper mirror shapes ([ and L).
  • Measurement of far-field intensity and near-field phase distributions for both configurations.

Main Results:

  • The L-shaped scraper configuration completely covers the gain medium.
  • The L-shaped scraper resulted in lower output coupling, higher output power, and slightly increased beam divergence compared to the [-shaped scraper.
  • Both configurations demonstrated the feasibility of off-axis unstable resonators for rectangular gain media.

Conclusions:

  • The L-shaped scraper is advantageous for maximizing output power in low-gain rectangular chemical oxygen iodine lasers.
  • Scraper geometry significantly influences output coupling and beam characteristics.
  • Off-axis unstable resonators provide a viable solution for high-power rectangular laser systems.