Share Email Print
cover

Proceedings Paper

Spectral narrowing of a 980nm tapered diode laser bar
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

High power diode laser bars are interesting in many applications such as solid state laser pumping, material processing, laser trapping, laser cooling and second harmonic generation. Often, the free running laser bars emit a broad spectrum of the order of several nanometres which limit their scope in wavelength specific applications and hence, it is vital to stabilize the emission spectrum of these devices. In our experiment, we describe the wavelength narrowing of a 12 element 980 nm tapered diode laser bar using a simple Littman configuration. The tapered laser bar which suffered from a big smile has been "smile corrected" using individual phase masks for each emitter. The external cavity consists of the laser bar, both fast and slow axis micro collimators, smile correcting phase mask, 6.5x beam expanding lens combination, a 1200 lines/mm reflecting grating with 85% efficiency in the first order, a slow axis focusing cylindrical lens of 40 mm focal length and an output coupler which is 10% reflective. In the free running mode, the laser emission spectrum was 5.5 nm wide at an operating current of 30A. The output power was measured to be in excess of 12W. Under the external cavity operation, the wavelength spread of the laser could be limited to 0.04 nm with an output power in excess of 8 W at an operating current of 30A. The spectrum was found to be tuneable in a range of 16 nm.

Paper Details

Date Published: 21 February 2011
PDF: 6 pages
Proc. SPIE 7918, High-Power Diode Laser Technology and Applications IX, 791814 (21 February 2011); doi: 10.1117/12.874764
Show Author Affiliations
Deepak Vijayakumar, Technical Univ. of Denmark (Denmark)
Ole Bjarlin Jensen, Technical Univ. of Denmark (Denmark)
Gaëlle Lucas Leclin, Lab. Charles Fabry, CNRS, Univ. Paris-Sud (France)
Paul Michael Petersen, Technical Univ. of Denmark (Denmark)
Birgitte Thestrup, Technical Univ. of Denmark (Denmark)


Published in SPIE Proceedings Vol. 7918:
High-Power Diode Laser Technology and Applications IX
Mark S. Zediker, Editor(s)

© SPIE. Terms of Use
Back to Top