Statistics – Applications
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jap...100f3109t&link_type=abstract
Journal of Applied Physics, Volume 100, Issue 6, pp. 063109-063109-5 (2006).
Statistics
Applications
1
Semiconductor Lasers, Laser Diodes, Laser Applications, Lunar, Planetary, And Deep-Space Probes
Scientific paper
NASA's mission requirements for spaceborne laser diode arrays lead to a set of tests peculiar to space flight. The goal of these tests is to determine if vibration, radiation, or vacuum will impair the operation or lifetime of nominally 100 W quasicontinuous wave 808 nm laser diode arrays. To simulate the stresses expected during a mission, terrestrial tests involve mechanical vibration, simulating the acceleration of launch, exposure to the equivalent doses of ionizing radiation, and operation in a vacuum. Three sets of devices were tested: one set with random vibration up to 20 g root-mean-square (grms) applied along three axes, a second set of devices was irradiated with γ radiation (1.17 and 1.33 MeV) at 744 rad(Si)/min up to 200 krad(Si), and the third set was exposed to a flux of 5×1011 or 1012 p/cm2 of 200 MeV protons up to 60 krad total dose. Only the proton irradiated devices showed any effect attributable to the test: a slight rise in lasing threshold, which recovered over time with self-annealing. A selection of the devices were then operated in vacuum for a further 1400 h accumulating 500×106 pulses without any signs of degradation. Similar results were obtained in a parallel test, conducted in air, accumulating over 109 pulses on a selection of the remaining devices.
Allan Graham R.
Kashem Nasir B.
Stephen Mark A.
Troupaki Elisavet
Vasilyev Aleksey A.
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