Analysis of Laser-Target Interaction. Volume 1. Theory
Final rept. 16 Dec 1977-15 Dec 1978
PHYSICAL SCIENCES INC ANDOVER MA
Pagination or Media Count:
This work was divided into three areas theoretical studies of pulsed laser interaction with metals theoretical studies of the interaction of repetitively pulsed 10.6 micrometers lasers with dome materials and first order concepts in the hardening of metals to repetitively pulsed radiation. Part I is devoted to theoretical studies of pulsed laser interaction with metals. The model for central thermal coupling to A12024 targets via plasma reradiation is improved by incorporating axial radiative transport within the plasma. The model is extended to include other metal alloy targets such as SS304, steel 4130 and Ti6Al4V. Based on absorbed fluence, a hierarchy is predicted for the metal targets. The model is also adapted to incorporate laser beams incident at oblique angles. The theory predicts substantial thermal and mechanical coupling at large angles of incidence, and the theoretical predictions are verified by the 1978 JANAF data. Part II deals with the interaction of pulsed 10.6 micrometers radiation with dome materials. First, theoretical models are advanced for the surface interaction of a pulsed laser with dome materials. A model is developed for repetitive pulse damage to fiberglass, based on delamination and the concept of a maximum amount of fluence per pulsed called residual energy which can be used to cause delamination.
- Lasers and Masers