We have observed optical bistability caused by absorption-induced thermal expansion of mirrors forming a Fabry–Perot interferometer. From the resulting anomalous transmission line shapes, absorption coefficients of the mirror coatings as low as 0.2parts in 10<sup>6</sup> (ppm) have been successfully measured.
© 1997 Optical Society of America
K. An, B. A. Sones, C. Fang-Yen, R. R. Dasari, and M. S. Feld, "Optical bistability induced by mirror absorption: measurement of absorption coefficients at the sub-ppm level," Opt. Lett. 22, 1433-1435 (1997)