Mechanisms of multiple shot bulk damage of silicate glasses in conditions of multiphoton absorption and without it

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:552231

Efimov, O M; Bosyi, O N; Glebov, L B ^[1]

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1. S.I. Vavilov State Optical Institute, St. Petersburg (Russian Federation); and others

Accumulation effect in silicate glasses under single frequency laser radiation (0.53 and 1.06 {mu}m) has been investigated. It is shown that this effect in lead silicate glasses at 0.53 {mu}m is resulted from the multiphoton matrix ionization, the accumulation of color centers and radiation absorption by them, and the decrease of thermal self-focusing threshold. However under radiation at 1.06 {mu}m in the same materials the multiphoton ionization and color centers formation are not observed. It is established that in this case accumulation effect is connected with densification of glasses in the interaction bulk. This densification is resulted from the action of large electrostrictional pressure. It leads to the modification of physical properties of glasses without electronic exitations and the decrease of the self-focusing threshold. In this connection the accumulation effect takes place only if electrostrictional pressure exceeds threshold value of pressure required to densification of glasses.

• Research Organization: International Society for Optical Engineering, Washington, DC (United States)
• OSTI ID: 552231
• Report Number(s): CONF-9410155--Vol.2428
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
COLOR CENTERS
DAMAGE
GLASS
LASER RADIATION
LEAD SILICATES
MULTI-PHOTON PROCESSES
NEODYMIUM LASERS
PHOTOIONIZATION
PHYSICAL RADIATION EFFECTS
TEMPERATURE DEPENDENCE