White, Jeffrey O. and Harfouche, Mark and Edgecumbe, John and Satyan, Naresh and Rakuljic, George and Jayaraman, Vijay and Burgner, Christopher and Yariv, Amnon (2017) 16 kW Yb Fiber Amplifier Using Chirped Seed Amplification for Stimulated Brillouin Scattering Suppression. Applied Optics, 56 (3). B116-B122. ISSN 0003-6935. https://resolver.caltech.edu/CaltechAUTHORS:20170309-135637258
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Abstract
In a high power fiber amplifier, a frequency-chirped seed interrupts the coherent interaction between the laser and Stokes waves, raising the threshold for stimulated Brillouin scattering (SBS). Moving the external mirror of a vertical cavity surface-emitting diode laser 0.2 μm in 10 μs can yield a frequency chirp of 5×1017 Hz/s5×1017 Hz/s at a nearly constant output power. Opto-electronic feedback loops can linearize the chirp, and stabilize the output power. The linear variation of phase with time allows multiple amplifiers to be coherently combined using a frequency shifter to compensate for static and dynamic path length differences. The seed bandwidth, as seen by the counter-propagating SBS, also increases linearly with fiber length, resulting in a nearly-length-independent SBS threshold. Experimental results at the 1.6 kW level with a 19 m delivery fiber are presented. A numerical simulation is also presented.
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| Additional Information: | © 2016 Optical Society of America. Received 2 August 2016; revised 16 October 2016; accepted 17 October 2016; posted 18 October 2016 (Doc. ID 273015); published 15 November 2016. Funding: High Energy Laser Joint Technology Office (13-SA-0509); U.S. Army Research Office (ARO) (W911NF-11-2-0081). | |||||||||
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| Issue or Number: | 3 | |||||||||
| Record Number: | CaltechAUTHORS:20170309-135637258 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20170309-135637258 | |||||||||
| Official Citation: | Jeffrey O. White, Mark Harfouche, John Edgecumbe, Naresh Satyan, George Rakuljic, Vijay Jayaraman, Christopher Burgner, and Amnon Yariv, "1.6 kW Yb fiber amplifier using chirped seed amplification for stimulated Brillouin scattering suppression," Appl. Opt. 56, B116-B122 (2017) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 74989 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 10 Mar 2017 03:04 | |||||||||
| Last Modified: | 03 Oct 2019 16:45 |
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