Abstract
We report nonlinear absorption data of and single layers at . A highly surface sensitive measurement strategy of the laser induced deflection technique is introduced and applied to measure the absorption of highly transparent thin films independently of the substrate absorption. Linear absorptions of and and and are found. Measured two photon absorption (TPA) coefficients are , , and . The TPA coefficients are several orders of magnitude higher than typical values for fluoride single crystals, which is likely to result from sequential two step absorption processes.
© 2009 Optical Society of America
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