Abstract

The use of a confocal detection scheme in a dual-beam thermal-lens microscope is presented. The scheme allows the measurement of absorption factors down to $1.2\times {10}^{-7}$ in a $0.35‐\mathit{\mu }{\mathrm{m}}^3$ volume by use of a heating laser power of 100 mW incident upon the sample. Results are presented that prove that a 450-nm axial resolution is possible when a 1.2 water immersion objective lens with a N.A. of 1.2 is used.

© 2004 Optical Society of America

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