Photo-induced processes in silicate glasses exposed to IR femotosecond pulses

Conference · Mon Dec 01 04:00:00 EST 1997

OSTI ID:552253

Efimov, O M ^[1]; Glebov, L B; Soileau, M J; Richardson, M ^[2]

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1. S.I. Vavilov State Institute, St. Petersburg (Russian Federation)
2. Univ. of Central Florida, Orlando, FL (United States); and others

The optical properties variation in silicate glasses (fused silica, boro-silicate crowns K8 (Russia) and BK7 (USA), and high purity alkali-silicate glass) after exposure to high-power femtosecond laser radiation at 0.85 {mu}m have been studied. The laser spectral line broadening leading to the supercontinuum generation in visible and UV spectral regions was observed in all studied glasses. Color center generation and intrinsic luminescence were found in boro- and alkali-silicate glasses. It is believed that these processes result from linear and/or two-photon absorption of the short-wavelength part of this supercontinuum which causes glass matrix ionization. No color center absorption in the visible region was observed in fused silica at irradiances up to the laser damage threshold. It was concluded that there is no significant ionization of fused silica under exposure to IR femtosecond laser pulses with irradiance below laser induced damage threshold.

• Research Organization: International Society for Optical Engineering, Washington, DC (United States)
• OSTI ID: 552253
• Report Number(s): CONF-961070--Vol.2966
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BOROSILICATE GLASS
DAMAGE
ELECTROMAGNETIC PULSES
GLASS
LASER RADIATION
MULTI-PHOTON PROCESSES
PHYSICAL RADIATION EFFECTS