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Proceedings Paper

Lasers with intra-cavity phase elements
Author(s): A. Alkan Gulses; Russell Kurtz; Gabriel Islas; Igor Anisimov
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Paper Abstract

Conventional laser resonators yield multimodal output, especially at high powers and short cavity lengths. Since highorder modes exhibit large divergence, it is desirable to suppress them to improve laser quality. Traditionally, such modal discriminations can be achieved by simple apertures that provide absorptive loss for large diameter modes, while allowing the lower orders, such as the fundamental Gaussian, to pass through. However, modal discrimination may not be sufficient for short-cavity lasers, resulting in multimodal operation as well as power loss and overheating in the absorptive part of the aperture.

In research to improve laser mode control with minimal energy loss, systematic experiments have been executed using phase-only elements. These were composed of an intra-cavity step function and a diffractive out-coupler made of a computer-generated hologram. The platform was a 15-cm long solid-state laser that employs a neodymium-doped yttrium orthovanadate crystal rod, producing 1064 nm multimodal laser output. The intra-cavity phase elements (PEs) were shown to be highly effective in obtaining beams with reduced M-squared values and increased output powers, yielding improved values of radiance. The utilization of more sophisticated diffractive elements is promising for more difficult laser systems.

Paper Details

Date Published: 20 February 2018
PDF: 11 pages
Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 1051318 (20 February 2018); doi: 10.1117/12.2291829
Show Author Affiliations
A. Alkan Gulses, Luminit LLC (United States)
Russell Kurtz, Luminit LLC (United States)
Gabriel Islas, Luminit LLC (United States)
Igor Anisimov, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 10513:
Components and Packaging for Laser Systems IV
Alexei L. Glebov; Paul O. Leisher, Editor(s)

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