Fused silica optics for laser diodes up to 500W

Fused silica optics for laser diodes up to 500W

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By Julien Happich

All high power laser applications require high-performance optics which convert the raw beam from the laser source into the most symmetrically shaped beam possible. To deliver the best possible performance and beam quality, the High Power BTS from LIMO is produced from ultra-pure fused silica with a minimum content of oxygen-hydrogen bonds. This glass absorbs virtually no laser light, which means that hardly any heating takes place, even in the case of high laser outputs.

When standard materials are used, the BTS can heat up, which in turn results in deteriorated optical properties (the “thermal lens” effect) and reduced performance. In contrast to this, the new High Power BTS made of Fused Silica remains thermally stable even in industrial high-performance applications, achieving high transmission rates better than 98%.

The new BTS can be used to both couple laser light into a circular fiber and produce a free laser beam. The system comprises the Fast Axis Collimator FAC160 (which is optimized for short focal lengths) and a diagonal lens array for a 90° rotation of the laser beam. It comes preassembled on a glass block (bottom tab) for easier handling. With a pitch of 200 or 400 µm, the system is capable of coupling up to 50 emitters with an output of approximately 250 to 500 W per bar and a 50% fill factor.

Visit LIMO Lissotschenko Mikrooptik GmbH at

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