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Patente

Tunable high-power narrow-spectrum external-cavity diode laser at 675 nm as a pump source for UV generation

M. Chi1, O.B. Jensen1, G. Erbert2, B. Sumpf2, and P.M. Petersen1

Published in:

Appl. Opt., vol. 50, no. 1, pp. 90-94 (2011).

Abstract:

High-power narrow-spectrum diode laser systems based on tapered gain media in an external cavity are demonstrated at 675 nm. Two 2 mm long amplifiers are used, one with a 500 µm long ridge-waveguide section (device A), the other with a 750 µm long ridge-waveguide section (device B). Laser system A based on device A is tunable from 663 to 684 nm with output power higher than 0.55 W in the tuning range; as high as 1.25 W output power is obtained at 675.34 nm. The emission spectral bandwidth is less than 0.05 nm throughout the tuning range, and the beam quality factor M2 is 2.07 at an output power of 1.0 W. Laser system B based on device B is tunable from 666 to 685 nm. As high as 1.05 W output power is obtained around 675.67 nm. The emission spectral bandwidth is less than 0.07 nm throughout the tuning range, and the beam quality factor M2 is 1.13 at an output power of 0.93 W. Laser system B is used as a pump source for the generation of 337.6 nm UV light by single-pass frequency doubling in a bismuth triborate (BIBO) crystal. An output power of 109 µW UV light, corresponding to a conversion efficiency of 0.026% W-1, is attained.

1 DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, DK-4000 Roskilde, Denmark
2 Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany

OCIS codes:

140.5960, 140.2020, 140.3280, 190.2620.

© 2011 Optical Society of America. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the Optical Society of America.

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