Radiation-induced negative optical nonlinearities in fused silica, sapphire, and borosilicate glass
- Univ. of Michigan, Ann Arbor, MI (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Idaho National Lab. (INL), Idaho Falls, ID (United States); Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of Michigan, Ann Arbor, MI (United States); Center for Ultrafast Optical Science, Ann Arbor, MI (United States)
Here, negative nonlinear absorption is reported in neutron- and gamma-irradiated high-OH content fused silica, low-OH content fused silica, sapphire, borosilicate glass, and radiation-resistant borosilicate glass irradiated to total neutron fluences of 3.4 × 1016 n ∙ cm–2 (42 Mrad γ), 1.7 × 1017 n ∙ cm–2 (211 Mrad γ), and 3.6 × 1017 n ∙ cm–2 (433 Mrad γ). Nonlinear absorption coefficients were measured via Z-scan and are on the order of – (10–14–10–10) m∙W–1. The Z-scan also reveals a negative nonlinear index of refraction in neutron- and gamma-irradiated radiation-resistant borosilicate glass on the order of –10–19 m2∙ W–1. Thermal annealing at temperatures up to 800 °C is shown to restore these nonlinearities to their positive unirradiated values in all four materials. All Z-scan measurements were performed at 532 nm with a nanosecond pulsed laser. The occurrence of negative nonlinearities may be attributed to the presence of metallic impurities and the resulting saturable absorption. A limited effect of photobleaching is observed in measurements and is quantified in multiple Z-scans.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; Defense Threat Reduction Agency (DTRA)
- Grant/Contract Number:
- AC05-00OR22725; NE0008906; HDTRA1-20-2-0002
- OSTI ID:
- 1973323
- Alternate ID(s):
- OSTI ID: 1973306
- Journal Information:
- Journal of Nuclear Materials, Vol. 582; ISSN 0022-3115
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Optical Absorption of Fused Silica and Sapphire Exposed to Neutron and Gamma Radiation with Simultaneous Thermal Annealing
Impact of Glass Irradiation on Laser-Induced Breakdown Spectroscopy Data Analysis