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Monitoring of Vapor Uptake by Refractive Index and Thickness Measurements in Thin Films
We report a method for real-time monitoring of vapor uptake by simultaneous detection of the refractive index, 𝑛 , and thickness, 𝑑 , of thin transparent films with a precision of 𝛿𝑛=10 −4 and 𝛿𝑑<100 nm . The setup ...
Refractive Index Sensor Based On An Abrupt Taper Michelson Interferometer In a Single-Mode Fiber
A simple refractive index sensor based on a Michelson interferometer in a single-mode fiber is constructed and demonstrated. The sensor consists of a single symmetrically abrupt taper region in a short piece of single-mode ...
Loss Determination in Microsphere Resonators by Phase-Shift Cavity Ring-Down Measurements
The optical loss of whispering gallery modes of resonantly excited microresonator spheres is determined by optical lifetime measurements. The phase-shift cavity ring-down technique is used to extract ring-down times and ...
Single-Mode Fiber Refractive Index Sensor Based on Core-Offset Attenuators
Mach-Zehnder and Michelson interferometers using core-offset attenuators were demonstrated. As the relative offset direction of the two attenuators in the Mach-Zehnder interferometer can significantly affect the extinction ...