NEAR-INFRARED BANDPASS FILTER AND OPTICAL SENSING SYSTEM

A near-infrared bandpass filter includes a substrate, a set of main films located on a first side of the substrate and a set of secondary films located on a second side of the substrate, wherein the second side is opposite to the first side. The set of main films includes a high refractive index film layer and a first low refractive index film layer arranged in a first preset stacked structure. The set of secondary films includes a second low refractive index film layer and a third low refractive index film layer arranged in a second preset stacked structure. In a wavelength range of 780 nm to 3000 nm, the near-infrared bandpass filter has at least one passband, and when a temperature is changed from −150° C. to 300° C., a drift amount of a center wavelength of the at least one passband is less than 0.15 nm/° C.