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What is a linear gradient filter?

The term “linear” in a linear gradient filter refers to the fact that its spectral characteristics vary differently at different locations and change linearly with spatial position. Linear gradient filters offer advantages such as continuous wavelength variation, selectable channels, and stable performance. Thanks to processes like ion-assisted deposition or ion-beam sputtering, which involve depositing multilayer films of varying thickness onto the substrate surface to form wedge-shaped film layers, the filter’s spectral characteristics exhibit a linear variation.

Compared to traditional narrowband filters, linear gradient filters offer nearly continuous spectral channels; thus, using linear gradient filters for spectroscopy can achieve higher spectral resolution. Compared to spectroscopic imaging devices such as prisms and gratings, spectroscopic imaging systems based on linear gradient filters feature high integration, high stability, and high resolution. These systems boast a compact overall structure, small size, and light weight, while also exhibiting lower research and development and manufacturing costs, making them highly promising for practical applications. Linear gradient filters can also be used in areas such as portable spectrometers, secondary-order optical separation or cutoffs using gratings, and laser mirror design.

A linear-varying filter (LVF) is a novel spectroscopic component that has emerged following the development of prisms, gratings, and various recently introduced spectral-splitting elements. Compared with traditional spectroscopic components such as prisms and gratings, LVFs offer advantages including compact size, multiple transmission bands, and flexible tuning of band positions. Since LVFs can be combined with CCD/CMOS detector arrays to form detectors capable of spectral recognition, they greatly simplify spectroscopic systems and enhance instrument reliability, stability, and optical efficiency, thereby attracting increasing attention. Spectrometers featuring LVFs as their core spectroscopic element have been successfully applied in numerous fields, including aerospace, field exploration, atmospheric monitoring, food safety inspection, biofluid analysis, and multi-/hyperspectral imaging.

Application:

Spectral imaging technology

Compared to spectral imagers based on prisms and gratings, spectral imagers utilizing linear gradient filters boast advantages such as high integration, high stability, and high resolution. Their overall design is compact, with a small size and light weight, while also featuring lower research, development, and manufacturing costs, making them highly promising for practical applications.

Linear gradient filters can also be used in portable spectrometers, grating-based second-order light separation/cutoff, laser mirror designs, and other related fields.

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Explanation of Related Terms for Filter Parameters (Part 2)

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Explanation of Related Terms for Filter Parameters (Part 2)

Champion Optics is a high-tech enterprise integrating the research and development of optical thin films, the development of new spectral instruments, and spectral image processing and application.

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