Narrow Bandpass Filters

Avantier excels as a leading manufacturer of both narrowband pass filters and ultra narrowband filters. Utilizing advanced plasma deposition technology, Avantier produces interference filters with high transmission and exceptional durability. These band pass filters are ideal for isolating a specific, narrow wavelength range while ensuring minimal Full-Width Half-Max (FWHM) and deep blocking in the rejection regions. With applications ranging from laser technology to molecular biology, Avantier’s filters offer a wide array of custom options, drawing on over fifty years of optical expertise.

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Narrow Bandpass Filter
Narrow Bandpass Filters, narrow bandpass filters, narrow bandpass optical filters, Custom Narrow Bandpass Filters, Narrow Bandpass Filter
Narrow Bandpass Filter

Purpose of Ultra Narrow Bandpass Filters: They are designed to isolate a very narrow region of wavelengths while rejecting all other wavelengths of light.

Manufacturing Technology: Avantier uses state-of-the-art plasma deposition technology to manufacture these filters, resulting in precise and durable thin-film filters.

Narrow Bandpass Optical Filter Specifications

  • Center Wavelength (CWL): The CWL is the midpoint of the passband and the location of peak transmission.
  • Full-Width Half-Max (FWHM): The FWHM indicates the width of the passband at half of the maximum transmission. For narrow bandpass optical filters, the FWHM is less than 6% of the central wavelength.
  • Pass Band Ripple: Some filters have a flat top passband, and the flatness is described by the pass band ripple. Low pass band ripple is desirable, especially in LiDAR applications to prevent spectral drift due to temperature cycling.
  • Blocking: Blocking in the rejection region is described by the optical density (OD), with deep blocking having an OD of 6.

Applications

  • Ultra narrow band filters are used in various sophisticated imaging setups and experiments.
  • Applications include laser cleanup, laser line filters, laser excitation filters, flow cytometry, DNA sequencing, PCR diagnostics, fluorescence microscopy, LiDAR, and Raman spectroscopy.
  • Ultra narrow band filters play a crucial role in reducing spectral cross-talk in cytometry and fluorescence in-situ hybridization.

Factory Standard

Material

UV fused silica

Center Wavelengths

from 355 nm to 1064 nm

FWHM

from 1.3 nm (for a 355 nm CWL filter) to 4.0 nm (for a 1064 nm CWL filter)

Surface Quality

60-40

Laser Damage Threshold

0.1 J/cm² @ 532 nm with a 10 ns pulse width

Custom Narrow Bandpass Filters

Avantier extends a range of personalized options, meticulously crafted to meet your exact specifications. Our accomplished engineering team boasts an extensive history of designing intricate optical systems across a myriad of applications. Whether you’re seeking additional information or aiming to explore our collection of in-stock and custom narrow bandpass filters, we invite you to reach out to Avantier

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