Spectral narrowing of a 980 nm tapered diode laser bar

Publication: Research - peer-reviewConference article – Annual report year: 2011

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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 tunable in a range of 16 nm.
Original languageEnglish
JournalProceedings of the SPIE - The International Society for Optical Engineering
Publication date2011
Volume7918
Pages791814
ISSN0277-786X
DOIs
StatePublished

Conference

ConferenceHigh-Power Diode Laser Technology and Applications
Number9
CitySan Francisco, California, USA
Period01/01/11 → …

Bibliographical note

2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

CitationsWeb of Science® Times Cited: 0

Keywords

  • External cavity laser, Wavelength stabilization, Diode lasers
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