Optical sensor based on cascaded f-p semiconductor laser and thin-film f-p filter

Abstract

The invention discloses an optical sensor based on cascade connection of an F-P (Fabry-Parot) semiconductor laser device and a thin film F-P optical filter. The optical sensor comprises one F-P semiconductor laser device, a collimating lens, a thin film F-P optical filter plane array with a periodic filtering spectrum, an imaging lens and a detector plane array, wherein light transmitted by the F-P semiconductor laser device passes through the collimating lens to be vertically transmitted to the thin film F-P optical filter plane array; the transmission light passes through the imaging lens to reach the detector plane array; the detector plane array is arranged at a focal plane position of the imaging lens. The optical sensor disclosed by the invention adopts the F-P semiconductor laser device with low cost as an input light source and the thin film F-P optical filter plane array and the detector plane array can be directly used for the work of simultaneously obtaining information of a plurality of substances to be detected; a spectrograph with a high resolution rate or a single-mode laser device with high-wavelength stability does not need to be additionally arranged so that the manufacturing cost of the sensor is greatly reduced.

Description

technical field [0001] The invention relates to an optical sensor, in particular to an optical sensor based on cascaded F-P (Fabry-Perot) semiconductor lasers and thin-film F-P filters. Background technique [0002] Label-free optical sensors have very important applications in the fields of biological detection, chemical analysis and environmental monitoring. Optical sensors allow fast, real-time monitoring of reaction processes. Optical sensors have the advantages of high sensitivity and strong anti-electromagnetic interference ability. Commonly used optical sensors include sensors based on surface plasmon resonance (SPR), optical sensors based on optical waveguide structures, such as single ring resonators, grating waveguide couplers, planar Mach-Zehnder waveguide interferometers, etc. [0003] The basic principles of these optical sensors are based on the interaction between the evanescent wave on the surface of the metal or waveguide and the substance to be measured, ...

AI Technical Summary

Problems solved by technology

Based on power detection, the narrow line width of the laser light source is required, and the stability of wavelength and power is very high; based on wavelength detection, spectrometers or tunable lasers are required. These instruments are not only bulky but also expensive, which is not conducive to the low-cost, low-cost optical sensor. The trend of portable development, and the coupling of input and output light based on optical waveguide sensors is very difficult

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