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According to their spectral characteristics, filters can be classified into several categories.

According to the spectral characteristics of filters, filters can be divided into six categories:

Bandpass filters, cutoff filters, spectroscopic filters, neutral-density filters, reflective filters, and notch filters (negative filters);

Bandpass type: Light within the selected wavelength band passes through, while light outside the passband is blocked. Its optical specifications primarily include the center wavelength (CWL) and full-width at half-maximum (FWHM). It is categorized into narrowband and broadband types.

Shortwave-pass (also known as low-wave-pass): Light with wavelengths shorter than the selected wavelength passes through, while light with wavelengths longer than that wavelength is blocked.

Long-pass filter (also known as high-pass filter): Allows light with wavelengths longer than a selected wavelength to pass through, while blocking light with wavelengths shorter than that selected wavelength.

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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