Time-Dependent Modeling of Brillouin Scattering in Optical Fibers Excited by a Chirped Diode Laser
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1.
United States Naval Academy
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2.
United States Army Research Laboratory
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3.
California Institute of Technology
Abstract
Numerical simulations are used to solve the coupled partial differential equations describing stimulated Brillouin scattering (SBS) built up from random thermal phonons as a function of time and the longitudinal spatial coordinate in an optical fiber. In the case of a passive fiber, a laser beam is incident with constant power, but its frequency is linearly ramped at 1.55 μm at a rate of up to 10^(16) Hz/s. High chirp rates lead to an increased Brillouin spectral bandwidth and decreased gain. The resulting SBS suppression is well described by an adiabatic model and agrees with experimental results. For an 18-m active fiber pumped at 1.06 μm and chirped at up to 2 × 10^(16) Hz/s, the suppression enables output laser powers in the kilowatt range while maintaining a narrow instantaneous linewidth.
Additional Information
© 2012 IEEE. Manuscript received June 29, 2012; revised October 8, 2012; accepted October 14, 2012. Date of publication October 18, 2012; date of current version October 31, 2012. This work was supported in part by the High Energy Laser Joint Technology Office under Grant 11-SA-0405. The authors would like to thank C. R. Menyuk for discussions of numerical methods. Computer programs provided to us by S. M. Wandzura, A. David, M. Horowitz, and R. B. Jenkins guided the writing of our codes, which ran on High Performance Computing Clusters at ARL, Aberdeen, MD, and at USNA Physics Department, Annapolis, MD, with the assistance of R. Witt.Additional details
Identifiers
- Eprint ID
- 36091
- Resolver ID
- CaltechAUTHORS:20121221-083718984
Funding
- High Energy Laser Joint Technology Office
- 11-SA-0405
Dates
- Created
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2012-12-21Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field