Open AccessTheory of surface thermal lens signal in optical coating with cw modulated top-hat beam excitation
Author(s) -
Xiaoxiao Chen,
Bincheng Li,
Yang Ya-pei
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.4673
Subject(s) - optics , diffraction , gaussian beam , beam (structure) , lens (geology) , materials science , signal (programming language) , thermal , excitation , laser beam quality , gaussian , m squared , amplitude , physics , laser , laser beams , quantum mechanics , meteorology , computer science , programming language
The theoretical model based on the Fresnel diffraction integral is developed to describe the surface thermal lens (STL) signal excited by a cw modulated top-hat beam. The three-dimensional profile of temperature rise, the radial profile of the surface displacement and the diffraction signal of the probe beam obtained with both top-hat and Gaussian beam excitations are compared by numerical calculation. The dependence of the surface thermal lens amplitude on the experimental parameters are discussed. Numerical results show that the top-hat beam STL instrument is more sensitive than the Gaussian beam STL instrument, with a maximum sensitivity enhancement factor of approximately 2.