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Identification and Control of a Grating-Stabilized External-Cavity Diode Laser

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6 Author(s)
Weyerman, W. ; Dept. of Comput. Sci., Brigham Young Univ., Provo, UT ; Neyenhuis, B. ; Archibald, J. ; Washburn, M.
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Diode lasers have many useful properties and have found a variety of uses including CD and DVD players, barcode scanners, laser surgery, water purification, quantum-key cryptography, spectroscopic sensing, etc. Nevertheless, their intrinsic linewidth or the precision of their emitted wavelengths, is not good enough for many cutting-edge applications such as atomic interferometry or high-performance atomic clocks. Using active feedback control, we can narrow the linewidth of a diode laser by not allowing the frequency of emitted light to drift away from a reference value. Nevertheless, such feedback designs are challenging because of a lack of first principles models and difficult sensor dynamics. This brief describes our diode laser system and reports our results identifying the system using black-box techniques, validating the empirical models, and designing controllers to achieve desired performance while preserving stability and satisfying implementation constraints.

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:17 ,  Issue: 1 )

Date of Publication:

Jan. 2009

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