The effects of neutron irradiation and temperature on optical fibers and materials
This thesis is a study of the effects of neutron irradiation and temperature on optical fibers and materials. This thesis deals with the effects of neutron irradiation on optical fibers, detectors and potential fiber materials. The study of the effects of neutron irradiation on optical fibers revealed that loss of transmission occurs due to irradiation. This loss is dependent on the radiation dose and also depends on the composition of the fibers. Annealing of the irradiated fibers was used to determine the activation energy of the defects. The recovery at different temperatures could be explained by a thermal charge untrapping model, indicating that the damage caused is mainly due to ionization. The similarity of the mechanisms causing the damage due to neutron and gamma radiation is explained. The study of the effects of neutron irradiation on a silicon avalanche photodiode indicates that degradation occurs in the current gain of this device, at a number of different wavelengths. The degradation increases with increasing dose. The multiplication noise decreased with increasing dose. The linearity of the device is maintained after irradiation. The signal to noise ratio was unaffected by the neutron irradiation. The effects were investigated of temperature and neutron irradiation on the vibrational modes of alkaline-earth fluorides. The temperature dependence of the frequency and lifetime of the first order Raman active mode in the alkaline fluorides was measured in the range of 83-500[degrees]K. The phonon frequencies decreased with temperature. The contribution to this shift due to anharmonicity was determined. The lifetimes of these modes decreased with increasing temperature. The effects of large fluences of neutron irradiation on the vibrational modes of CaF[sub 2] were observed. Up to doses of 5 x 10[sup 19] nvt, no additional vibrational modes are observed. The IR absorption edge shifts to higher wave numbers with increasing dose.
- Research Organization:
- Rhode Island Univ., Kingston, RI (United States)
- OSTI ID:
- 7020194
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKALINE EARTH METAL COMPOUNDS
IRRADIATION
OSCILLATION MODES
FLUORIDES
NEUTRONS
PHYSICAL RADIATION EFFECTS
OPTICAL FIBERS
OPTICAL PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
BARYONS
ELEMENTARY PARTICLES
FERMIONS
FIBERS
FLUORINE COMPOUNDS
HADRONS
HALIDES
HALOGEN COMPOUNDS
NUCLEONS
PHYSICAL PROPERTIES
RADIATION EFFECTS
TEMPERATURE RANGE
360605* - Materials- Radiation Effects
360606 - Other Materials- Physical Properties- (1992-)