18 May 2017 Feedback stabilization of quantum cascade laser beams for stand-off applications
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Abstract
Techniques which apply tunable quantum cascade lasers (QCLs) for target illumination suffer from fluctuations of the laser beam direction. This manuscript describes a method to stabilize the beam direction by using an active feedback loop. This approach corrects and stabilizes the laser pointing direction using the signal from a 4-element photo sensor as input to control an active 2 dimensional Galvo mirror system. Results are presented for measurements using known perturbations as well as actual mode hops intrinsic to external cavity QCL during wavelength tuning.
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Reik Müller, Reik Müller, Christopher A. Kendziora, Christopher A. Kendziora, Robert Furstenberg, Robert Furstenberg, } "Feedback stabilization of quantum cascade laser beams for stand-off applications", Proc. SPIE 10194, Micro- and Nanotechnology Sensors, Systems, and Applications IX, 101942U (18 May 2017); doi: 10.1117/12.2262202; https://doi.org/10.1117/12.2262202
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