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Proceedings Paper

Optimized resonators for high-average-power high-brightness Nd:YAG lasers with birefringence compensation
Author(s): Stefan Seidel; Andre Schirrmacher; Guido Mann; - Nursianni; Thomas Riesbeck
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Paper Abstract

Transversely cooled, cylindrical Nd:YAG laser rods exhibit a strong thermally induced birefringence when they are optically pumped. The birefringence leads to different refractive indices for radially and tangentially polarized light which affects the beam-quality and the degree of polarization achieved with conventional optical resonators. In spite of this drawbacks the traditional rod-geometry for Nd:YAG lasers is still of great interest because of its technological simplicity, comparatively low costs and acceptable efficiency. In the present study the limitations for the output power of single rod Nd:YAG lasers in TEM00- operation is investigated theoretically and experimentally. Furthermore the possibility of improving the brightness of Nd:YAG rod lasers beyond the traditional limits using dual rod systems with birefringence compensation is demonstrated. Birefringence compensation is established by image-relaying between two identical Nd:YAG laser rods and an additional 90 degree(s) polarization rotation. This compensation method requires specific dynamically stable optical resonators in order to achieve optimal compensation and high efficiencies. With a dual rod Nd:YAG-system up to 80 Watt TEM00 output power is achieved with a beam quality of M2 equals 2.8. The output power is approximately 8 times higher than using a single rod-system separately.

Paper Details

Date Published: 13 May 1998
PDF: 12 pages
Proc. SPIE 3267, Laser Resonators, (13 May 1998); doi: 10.1117/12.308109
Show Author Affiliations
Stefan Seidel, Laser- und Medizin-Technologie gGmbH (Germany)
Andre Schirrmacher, Laser- und Medizin-Technologie gGmbH (Germany)
Guido Mann, Technische Univ. Berlin (Germany)
- Nursianni, Technische Univ. Berlin (Germany)
Thomas Riesbeck, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 3267:
Laser Resonators
Alexis V. Kudryashov; Pierre Galarneau, Editor(s)

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