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A fiber-optic bolometer based on a high-finesse silicon Fabry-Pérot interferometer.
Review of Scientific Instruments 2018 June
We report a fiber-optic bolometer based on a high-finesse silicon Fabry-Perot interferometer (FPI). The silicon FPI absorbs and converts the incident radiation into temperature variations, which are interrogated by the shift of the reflection spectrum of the FPI. The FPI is a silicon pillar with one side coated with a high-reflectivity dielectric mirror and the other side coated with a gold mirror. A multimode fiber collimator is applied between the FPI and lead-in single-mode fiber to reduce the round-trip diffraction loss, giving rise to a high-finesse of 35 of the FPI. The sensor is demodulated using a low-cost distributed feedback diode laser. A dummy bolometer was used to effectively reduce the common noises from the laser wavelength drift and ambient temperature variations. Experimental results show that, compared with a previously reported fiber-optic bolometer, the one reported here has a 5-fold decrease in noise and a 7-fold increase in responsivity with a noise equivalent power density (NEPD) of 0.27 W/m2 , which is comparable with the NEPDs of the state-of-the-art resistive bolometers.
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