A new compact high brilliance diode laser type

F. Bammer; B. Holzinger

doi:10.1117/12.793300

5 March 2008 A new compact high brilliance diode laser type

F. Bammer, B. Holzinger

Proceedings Volume 7009, Second International Conference on Advanced Optoelectronics and Lasers; 700907 (2008) https://doi.org/10.1117/12.793300
Event: Second International Conference on Advanced Optoelectronics and Lasers, 2005, Yalta, Ukraine

Abstract

Our work deals with a new approach to improve the beam quality of diode lasers, which is still insufficient for many applications. We propose time-multiplexing, where several pulsed laser diode beams are guided onto a common optical path. This allows to superpose the power of the diodes while maintaining the beam parameter product of a single laser diode. Pulsed operation of continuous wave laser diodes was shown to be possible up to pulse enhancement factors of ten provided that pulse duration is <300 ns. We use a fast digital optical multiplexer built up by a cascade of binary optical switches. For the latter we use a polarisation switch (voltage-driven LiNbO₃-crystal) followed by a polarisation filter, which allows addressing of two optical paths. Instead of direct on/off-switching we drive the crystals with a harmonic voltage course to avoid ringing caused by piezo-electricity. Up to now an optical power of 10.5 W was generated, 13 W are expected with some improvements. With the use of new 8W laser diodes even the generation of 25 W will be possible.

Citation Download Citation

F. Bammer and B. Holzinger "A new compact high brilliance diode laser type", Proc. SPIE 7009, Second International Conference on Advanced Optoelectronics and Lasers, 700907 (5 March 2008); https://doi.org/10.1117/12.793300

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