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High power 7-GHz bandwidth external-cavity diode laser array and its use in optically pumping singlet delta oxygen

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High power 7-GHz bandwidth external-cavity diode laser array and its use in optically pumping singlet delta oxygen

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  • Author: Lei S. Meng, Boris Nizamov, Pratheepan Madasamy, Jason K. Brasseur, Tom Henshaw, David K. Neumann
In this paper we report a diode laser array linewidth-narrowing technique using the volume Bragg grating. Because of the use of a thick VBG, low smile DLA, and high quality AR-coating on the emitters’ front facets, a bandwidth of 7-GHz from ECDLA is achieved. To our knowledge, this is the narrowest bandwidth achieved in the DLA bandwidthnarrowing technique. Total output power of our ECDLA reaches 13.5 W cw, of which 86% is in the 7-GHz lasing band. Laser’s frequency can be conveniently tuned by changing the temperature of the VBG at a rate of 3.3 GHz/o C. With this narrow bandwidth and tunability, we successfully tune the laser’s frequency across an absorption line of oxygen.

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