Damage to CdS single crystals by laser self-emission
Abstract
Transmission electron microscopy (TEM) was used to study the defect structure and damage morphology in CdS crystals caused by stimulated self-emission under excitation by a pulsed nitrogen laser (lambda = 337 nm). Plate CdS crystals 0.2-0.5 micron thick were used to carry out TEM investigations before and after laser action. It is found that the damage can be attributed to melting and evaporation due to the development of a thermal instability arising from the following processes: (1) radiation absorption by precipitates, dislocations, and nonequilibrium free carriers; (2) self-focusing; and (3) focusing by elastooptical lenses formed by precipitate stress fields.
- Publication:
-
Kvantovaia Elektronika Moscow
- Pub Date:
- January 1987
- Bibcode:
- 1987KvanE..14..164R
- Keywords:
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- Cadmium Sulfides;
- Crystal Defects;
- Laser Damage;
- Single Crystals;
- Crystal Dislocations;
- Electron Microscopy;
- Evaporation;
- Stress Distribution;
- Lasers and Masers