Characterization of the Radiation Hard Harris/Dins Ring Laser Gyro Photodetectors.
Topical rept. 28 Jan-30 Jun 80,
MISSION RESEARCH CORP LA JOLLA CA
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Specially designed radiation hard dielectrically isolated photodiodes constructed specifically for a HeNe 632.8 nm ring laser gyroscope, have been characterized. The spectral response shows a peak of 0.4 or - 0.1 Awatt in the range of 600 to 700 nm. The measured radiation induced photocurrent of 5.7 or - 1.8 x 10 to the -13th power coulrad compares favorably with expectations based on device geometry 7.8 x 10 to -13th power coulrad. Under nominally identical illumination, optical photocurrents from matching detectors agree to approximately 1.5 or - 0.5 percent and ionizing radiation produced photocurrent agrees to approximately 6 or - 4 percent. Detectors which had been exposed to 10 to a million radSi exhibited responsivities 78 or - 14 percent as large as that of virgin detectors. Chip to chip responsivity variations were about or - 30 percent. Relevant physics and construction details are reported. Author
- Lasers and Masers
- Optical Detection and Detectors