Events Calendar
Preliminary Plans for the Death Star: An Overview of Kilowatt-Class Narrow-Linewidth Fiber Amplifiers
Thursday December 3, 2015
| 11:00 am
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Presenter: | Dr. Jacon Grose, AFRL Directed Energy Directorate |
|---|---|---|
| Series: | OSE Seminars | |
| Abstract: | Fiber laser/amplifier systems have several advantageous attributes that make them excellent candidates for power scaling while maintaining near diffraction limited beam quality. Fiber lasers provide excellent beam quality, high efficiency, good thermal management, low maintenance costs, and have a propitious size, weight, and power (SWaP) compared with other laser/amplifier options. Rare-earth doped fibers are still the preferred gain media for most fiber laser/amplifier systems because of their high slope efficiencies and the availability of high quality, low brightness, high-power light emitting diode pumps, which can inject light into the fiber with intrinsically low insertion loss. Key to maintaining an excellent beam quality and good pointing stability at high powers is to ensure single-mode operation, to mitigate deleterious nonlinearities, i.e., stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), self-phase modulation (SPM), cross-phase modulation (XPM), and four-wave mixing (FWM), and to suppress detrimental thermal effects, i.e. thermal lensing, thermally induced long period gratings (LPGs), and the modal instability (MI) phenomenon. This talk will describe basics of high-power fiber amplifier operation and it will discuss recent advances in overcoming these pernicious optical nonlinearities and thermal effects. | |
| Location: | PAIS-2540, PAIS | |
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