Transverse photothermal beam deflection within a solid
1991; American Institute of Physics; Volume: 70; Issue: 2 Linguagem: Inglês
10.1063/1.349659
ISSN1520-8850
AutoresJonathan D. Spear, Richard E. Russo,
Tópico(s)Laser Material Processing Techniques
ResumoThe mirage effect within a transparent solid substrate was used for monitoring optical absorption of a thin film. Refractive index gradients, which accompany thermal gradients below the film-coated surface, cause a probe laser beam to be deflected. The spectrum of copper, deposited onto a piece of clear acrylic, was recorded by this method of photothermal deflection. The influence of thermally induced mechanical stresses can alter the effective value of the thermo-optic coefficient of the solid, dn/dT.
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