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Fundamental mode radiation with solid-state lasers

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3 Author(s)
Steffen, J. ; Institute of Applied Physics, Univ. of Berne, Berne, Switzerland ; Lortscher, J.-P. ; Herziger, G.

Optical pumping of solid-state lasers induces thermal lensing in the laser crystal. This lansing determines the beam properties in the resonator; the TEM00-mode radiation is limited to a small laser rod volume and it depends on the pump power. Especially with pulse-pumped systems, the generation of stable fundamental mode radiation could only be obtained with low efficiency. Laser resonators with optimum TEM00mode output were studied considering the thermal lensing. A kind of resonator was found, the radiation of which is insensitive to thermal distortions. The following is determined by parameters g_{1}, g_{2} : frac{1}{g_{1}}=2g_{2} +^{1} (frac{a}{b})^{2} + 2frac{a}{b} , where a and b are distances between rod ends and mirrors, a and b being the distances between the two mirrors and the lens. The predicted beam behavior was verified experimentally with a high repetition rate YAG laser. A high-precision laser drilling machine was constructed with this design. Because of the insensitive properties, reproducible material processing was achieved in industrial use.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:8 ,  Issue: 2 )