We investigate an internal-transmission method for measuring microdeflections of an optical beam as a potential tool for the development of new compact and stable optical sensors. We calculate the detection limits of the internal-transmission method when an ideal coherent optical source and an ideal quasi-monochromatic thermallike source are used. The proposed method is compared with an internal-reflection method previously studied. It is found theoretically and verified experimentally that the transmission method may have better resolution than the reflection method. We also compare the calculated sensitivity as a function of the angle of incidence with experimental results for both methods.
© 1998 Optical Society of America
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(130.6010) Integrated optics : Sensors
(230.0040) Optical devices : Detectors
(230.5480) Optical devices : Prisms
(260.6970) Physical optics : Total internal reflection
Joel Villatoro and Augusto García-Valenzuela, "Measuring Optical Power Transmission Near the Critical Angle for Sensing Beam Deflection," Appl. Opt. 37, 6648-6653 (1998)