2019/09/22 by Garcia, Hernando, Serna, Juan, Rueda, Edgar
#Applied Physics (physics.app-ph) #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det)
paper · doi:10.48550/arxiv.1909.09933
Using an Electrically Focus Tunable Lens (EFTL), an integrating sphere and a tunable femtosecond-pulse laser (Mai Tai HP), we were able to measure the degenerate two-photon absorption coefficient (in transmission) of CdS and ZnSe in a long range of wavelengths (690-1040 nm), with a 5 nm resolution, in less than 30 minutes. We compared our results with theoretical approaches for the dispersion relations of the non-linear properties of semiconductors, and found excellent agreement with the experimental results. The system has no moving parts, is highly compact, and is fully automated.