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18 January 1977 Laser Driven Subnanosecond Blast Shutter
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We have measured the opening time of the so-called "blast shutter", presently used as an isolator in high-power laser systems. The shutter consists of a 275 A thick aluminum film deposited on a transparent plastic film 12 4 thick. The aluminum film is suddenly removed by exposing it to high-power pulses from a Nd:glass laser (X = 1.06 4). We have used pulses 50 ps in duration that delivered between 0.5 and 3 J/cm2 of energy onto the aluminum film. The absorbed energy superheats the film and turns it into a rapidly expanding cloud of aluminum vapor. A blue laser beam from a CW argon laser passes through the shutter and is detected by an ultrafast streak camera, set for 50 ps resolution. With this arrangement 10-90% shutter opening times varying from 0.8 to 4 ns have been measured, the former occurring at laser pulse energy densities of ≈ 2 J/cm2.
© (1977) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. A. Duguay, M. A. Palmer, and R. E. Palmer "Laser Driven Subnanosecond Blast Shutter", Proc. SPIE 0094, High Speed Optical Techniques: Developments and Applications, (18 January 1977);


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