Nonlinear absorption initiated laser-induced damage in. gamma. -irradiated fused silica, fluorozirconate glass and cubic zirconia
Thesis/Dissertation
·
OSTI ID:6972860
The contributions of nonlinear absorption processes to laser-induced damage of three selected groups of transparent dielectrics were investigated. The studied materials were {gamma}-irradiated and non-irradiated fused silica, doped and undoped fluorozirconate glass and cubic zirconia stabilized with yttria. The laser-induced damage thresholds, prebreakdown transmission, and nonlinear absorption processes were studied for several specimens of each group. Experimental measurements were performed at wavelengths of 1064 nm and 532 nm using nanosecond and picosecond Nd:YAG laser pulses. In the {gamma}-irradiated fused silica and fluorozirconate glasses, a correlation was found between the damage thresholds at wavelength {lambda} and the linear absorption of the studied specimens at {lambda}/2. In other words, the laser-induced breakdown is related to the probability of all possible two-photon transitions. In cubic zirconia, significant energy is deposited in the samples at wavelength 532 nm prior to electron avalanche formation. The mechanism is found to be due to formation of color centers (F{sup +} or F{sup 0} centers) by the two-photon absorption process. The presence of these centers was directly shown by transmission measurements.
- Research Organization:
- North Texas State Univ., Denton, TX (USA)
- OSTI ID:
- 6972860
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
BEAMS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
GAMMA RADIATION
GLASS
IONIZING RADIATIONS
LASER RADIATION
METALLURGICAL EFFECTS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOTON BEAMS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
BEAMS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
GAMMA RADIATION
GLASS
IONIZING RADIATIONS
LASER RADIATION
METALLURGICAL EFFECTS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOTON BEAMS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES