Damage Threshold Studies in Laser Crystals
Final technical rept. 16 Jun 1969-15 Jun 1972
HUGHES RESEARCH LABS MALIBU CA
Pagination or Media Count:
The report contains a cumulative summation of a three-year experimental and theoretical program on laser induced damage in ruby and sapphire at 6943 A. Both bulk and surface damage were studied, using a well- characterized single transverse and longitudinal mode Q-switched ruby laser and amplifier. Temporal studies of the development of internal damage tracks using a high speed streak camera have been correlated with self-focusing theory with good agreement and constitute the first direct evidence for moving self-foci in solids. It has been found that beams with elliptical spatial cross-sections have higher self-focusing thresholds than circular beams. An investigation into the relation between surface damage and surface plasmas is described. Theoretical efforts have developed a new model for optical breakdown in materials based on a transfer of optical energy to photoelectrons which undergo rapid energy transfer to acoustic phonons via optical phonons.
- Lasers and Masers
- Radioactivity, Radioactive Wastes and Fission Products