Time resolved transmission and reflectivity of pulsed ruby laser irradiated silicon

Conference · Sun Nov 01 04:00:00 EST 1981

OSTI ID:5676479

Lowndes, D H

The time resolved optical transmission, T (at lambda = 1152 nm), and reflectivity, R (at 633 nm and 1152 nm), have been measured for n-type single crystalline silicon (C-Si) during and immediately after pulsed ruby laser irradiation (lambda = 693 nm, FWHM pulse duration 14 nsec), for a range of pulsed laser energy densities, E/sub l/. The T is found to go to zero, and to remain at zero, for a period of time that increases with increasing E/sub l/, in apparent disagreement with earlier measurements elsewhere that used semi-insulating Si and a different pulsed laser wavelength. Measured reflectivities during the high R phase agree within experimental error with reflectivities calculated from the optical constants of molten Si. Quantitative agreement is also found between both our T and R measurements and detailed time- and E/sub l/- dependent results of thermal melting model calculations.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5676479
• Report Number(s): CONF-811122-34(Draft); ON: DE82003989
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360605* -- Materials-- Radiation Effects
ELECTROMAGNETIC RADIATION
ELEMENTS
LASER RADIATION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
REFLECTIVITY
SEMIMETALS
SILICON
SURFACE PROPERTIES