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 1.2×10<sup>-7</sup> in a 0.35-μm<sup>3</sup> 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
Julien Moreau and Vincent Loriette, "Confocal thermal-lens microscope," Opt. Lett. 29, 1488-1490 (2004)