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OPTICS / OPTICAL FILTERS / BANDPASS FILTERS
Bandpass filters transmit a well-defined wavelength band of light, while rejecting other unwanted radiation. Optical bandpass filters allow the isolation of a band of wavelengths from the total spectrum, enabling higher energy throughput and greater out-of-band rejection, without the use of dispersing elements such as prisms or gratings.
The spectral performance of a Bandpass filter is primarily determined by two factors:
Glass Composition: The specific colorants used dictate which wavelengths are absorbed. Different types of glasses, such as those from manufacturers like SCHOTT and HOYA, have unique transmission curves.
Filter Thickness: Since the filtering is based on absorption, the thickness of the glass directly affects the amount of light that is absorbed. A thicker filter will absorb more light and have a steeper transition between the blocked and transmitted wavelengths.
2.1) DIA25.4mm Standard Bandpass Filters
Bandpass filters transmit a well-defined wavelength band of light, while rejecting other unwanted radiation. Optical bandpass filters allow the isolation of a band of wavelengths from the total spectrum, enabling higher energy throughput and greater out-of-band rejection, without the use of dispersing elements such as prisms or gratings.
2.2) Assorted Blue Green Red Bandpass Filters
Assorted Bandpass filters transmit a well-defined wavelength band of light, while rejecting other unwanted radiation. Optical bandpass filters allow the isolation of a band of wavelengths from the total spectrum, enabling higher energy throughput and greater out-of-band rejection, without the use of dispersing elements such as prisms or gratings.
Assorted Bandpass Filters offer high OD5 covering 200-1100nm, narrow bandpass transmisson >75%.
2.3) Narrowband Bandpass Filters(for Eye-Safe Lasers)
Bandpass filters transmit a well-defined wavelength band of light, while rejecting other unwanted radiation. Optical bandpass filters allow the isolation of a band of wavelengths from the total spectrum, enabling higher energy throughput and greater out-of-band rejection, without the use of dispersing elements such as prisms or gratings.
2.4) Large-Area Custom-Shape Bandpass Filters
Bandpass filters are applied diversely in applications where spectral isolation is required, such as spectral radiometry, medical diagnostics, chemical analysis, colorimetry, astronomy etc. These filters provide a defined spectral band of high average transmission and bands of high rejection of spectral energy on both the long wavelength and short wavelength sides of the cut-on wavelengths.