Laser induced absorption at 355nm in silica studied by calorimetry and photothermal deflection
- LETI-CEA-DOPT Couches Minces Optiques, Grenoble (France)
Laser calorimetry is used to measure low losses of optical samples on the third harmonic of a YAG laser. During the experiments, degradation of bare SiO2 substrate was observed. This degradation consists of an absorption increasing with the laser pulse number. The observed evolution depends on the kind of silica tested and particularly on the OH content of the material. The observed evolution required both changes in the electron content of the existing traps and the creation of new traps or color centers. Using an Argon laser at 351 nm, relaxation of YAG induced absorption was observed. This point enables an evolution mechanism to be proposed related to charge modification of the existing traps and to a multiphoton absorption process during the YAG irradiation.
- Research Organization:
- International Society for Optical Engineering, Washington, DC (United States)
- OSTI ID:
- 552031
- Report Number(s):
- CONF-9510106-Vol.2714; TRN: 97:005737-0007
- Resource Relation:
- Conference: 27. annual symposium on optical materials for high power lasers, Boulder, CO (United States), 30 Oct - 1 Nov 1995; Other Information: PBD: [1996]; Related Information: Is Part Of Laser-induced damage in optical materials: 1995. Twenty-seventh annual Boulder damage symposium, proceedings; Bennett, H.E.; Guenther, A.H.; Kozlowski, M.R.; Newnam, B.E.; Soileau, M.J. [eds.]; PB: 794 p.
- Country of Publication:
- United States
- Language:
- English
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