1 July 1991 Design and energy characteristics of a multisegment glass-disk amplifier
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Proceedings Volume 1410, Solid State Lasers II; (1991) https://doi.org/10.1117/12.43585
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States
Abstract
Multi-segment disk amplifiers (MSA) are of particular interest in fusion laser systems because of the improved efficiency and compactness they offer compared with conventional disk amplifiers. A multisegment amplifier consists of two or more conventional disk amplifiers which share one or more common flash-lamp arrays. Each 'segment' amplifies one 'beamlet.' A 2 x 2 MSA can therefore amplify four beamlets. The shared flash-lamp arrays, lacking large reflectors, pump the disks more efficiently because of reduced lamp self-absorption. Furthermore, the reduction of reflector surface area per unit disk area reduces absorptive losses of pump light. The authors have constructed a 2 x 2 MSA with individual beamlet apertures of 24 cm. Each aperture contains five phosphate glass disks. This device is designed to be angularly double-passed by a 20-cm beam. Design details and rationale are presented. The energy transport performance of the amplifier was measured in both small- and large-signal regimes. A nominal small-signal gain of 11.8 was measured. The storage efficiency exceeded 3.5% at the nominal operating point. The amplifier was deployed as a booster for one beamline of the OMEGA laser system at the University of Rochester. In that configuration, 950 J of focusable energy was obtained from a single segment in a 800-ps pulse at 130-J drive. Details of these measurements are presented.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John H. Kelly, Milton J. Shoup, Mark D. Skeldon, Snow T. Bui, "Design and energy characteristics of a multisegment glass-disk amplifier", Proc. SPIE 1410, Solid State Lasers II, (1 July 1991); doi: 10.1117/12.43585; https://doi.org/10.1117/12.43585
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