A simple and sensitive photothermal technique—photothermal detuning, in which the spectral shift of an optical coating caused by absorption-induced temperature rise is used to measure the photothermal signal—and its application for the absorption measurement of coated optical components are developed theoretically and experimentally in detail for the first time to the best of our knowledge. The theoretical description of the photothermal detuning signal with a continuous-wave modulated laser beam excitation is presented.
Experiments are conducted with a highly reflective coating used at
© 2008 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: October 3, 2007
Manuscript Accepted: November 14, 2007
Published: January 8, 2008
Honggang Hao and Bincheng Li, "Photothermal detuning for absorption measurement of optical coatings," Appl. Opt. 47, 188-194 (2008)