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Proceedings Paper

Nd:YAG-laser-Q-switching with a photo-elastic modulator and applications
Author(s): F. Bammer; R. Petkovšek; H. Dominguez; G. Liedl
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Paper Abstract

We present a rod-Nd:YAG-Laser, side-pumped with eight 50W-laser diode bars at 808nm, and Q-switched with a Single Crystal Photo-Elastic Modulator at 95.1 kHz. The latter is made of a z-cut LiNbO3-crystal, which is electrically y-excited on the mechanical resonance frequency of the x-longitudinal oscillation. With a voltage amplitude of 3 V the crystal shows a strong oscillation such that due to the photo-elastic effect a high polarization modulation is achieved, which, together with a polarizer, can be used as a simple optical switch. With this inside the laser resonator the average power is 47.8W in cw-mode and 45.5W in pulsed mode, with pulse peak powers of 4 kW and pulse widths of 100ns. This kind of operation is similar to cw-operation but offers due to the high peak powers different interaction physics with matter. The source is therefore suited for micro-welding of metals, LIDAR, rapid prototyping of plastics, marking/engraving/cutting of plastics, marking of glasses. In cases where high precision and a small heat affected zone are necessary this simple kind of pulsed operation may be advantageous, when compared to cw-operation.

Paper Details

Date Published: 19 May 2010
PDF: 6 pages
Proc. SPIE 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers, 77210Y (19 May 2010); doi: 10.1117/12.854724
Show Author Affiliations
F. Bammer, Vienna Univ. of Technology (Austria)
R. Petkovšek, Univ. of Ljubljana (Slovenia)
H. Dominguez, Vienna Univ. of Technology (Austria)
G. Liedl, Vienna Univ. of Technology (Austria)

Published in SPIE Proceedings Vol. 7721:
Solid State Lasers and Amplifiers IV, and High-Power Lasers
Thomas Graf; Gerhard G. Paulus; Jacob I. Mackenzie; Vincent Bagnoud; Catherine Le Blanc; Helena Jelinková, Editor(s)

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