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Bandpass Filters

Bandpass Filters are used to selectively transmit a portion of the spectrum while rejecting all other wavelengths. Bandpass Filters are ideal for a variety of applications, such as fluorescence microscopy, spectroscopy, clinical chemistry, or imaging. These filters are typically used in the life science, industrial, or R&D industries.

Edmund Optics offers a wide variety of Bandpass Filters in a range of bandwidth options for ultraviolet (UV), visible (VIS), or infrared (IR) applications. Laser Line filters typically have narrow bandwidths of 2 – 5nm for demanding laser applications. Fluorescence Filters, which have been designed to maximize the energy of the excitation and emission bands, typically have broad bandwidths of 20 – 70nm. Edmund Optics’ 10nm filters are ideal for chemical, environmental, or elemental analysis. Hard coated filters offer maximum performance with exceptional durability. Traditionally coated evaporated filters are cost-sensitive alternatives. Bandpass Filters are angular sensitive, so care should be taken when mounting or integrating into an optical system.

Bandpass Filter Selection Table

		Bandwidth Bandwidth is the spectral range over which an optical filter will transmit illumination. Narrow bandwidth filters (<20nm) are typically used in elemental and chemical analysis applications, analytical instrumentation, and laser line clean up. Broad bandwidths (>20nm) are commonly used in imaging applications, including fluorescence microscopy, machine vision, and factory automation. Visit our application note on Optical Filters for more information.
		Broad Band for Fluorescence Imaging and Machine Vision Applications	Narrow Band for Chemical Analysis or Laser Clean Up	Kits, Sets, and Specialty Filters
Optical Density Optical Density describes the amount of energy blocked or rejected by a filter. A high optical density value indicates low transmission, and low optical density indicates high transmission. Optical densities of 6 or greater are used for creating high signal-to-noise in applications such as fluorescence microscopy. Optical densities of 3.0 – 4.0 are ideal for laser separation and clean-up, machine vision, and chemical detection, while optical densities of 2.0 or less are ideal for color sorting and separating spectral orders. Visit our application note on Optical Filters for more information.	OD 8.0 Blocking (<0.000001% Transmission) OD 8.0 Filters are manufactured using state of the art thin film coating technologies providing highest levels of precision and spectral performance> They enable optical systems with the highest demand on signal to noise performance.	OD8 Fluorescence Bandpass Filters	Ultra Narrow Bandpass Filters
	OD 6.0 Blocking (<0.0001% Transmission) OD 6.0 Filters are fabricated utilizing advanced Hard Coating technologies including ion beam sputtering (IBS) and magnetron sputtering, guaranteeing high transmission, deep blocking, and extended lifetimes.	Fluorescence Bandpass Filters	High Performance Laser Line Bandpass Filters	Fluorescence Filter Sets
		Multi-Band Fluorescence Bandpass Filters	Ultra Narrow Bandpass Filters	Pre-Mounted Fluorescence Filter Sets
				Unmounted Fluorescence Bandpass Filters
	OD 4.0 Blocking (<0.01% Transmission) OD 4.0 Filters are typically manufactured utilizing high volume Hard Coating technologies, guaranteeing high transmission, deep blocking, extended lifetimes, and generous volume discounts.	Hard Coated OD5 Bandpass Filters	Hard Coated OD4 10nm Bandpass Filters	Hard Coated OD 4.0 Bandpass Filter Kits
		Hard Coated OD4 50nm Bandpass Filters	Hard Coated OD4 5nm Bandpass Filters	Unmounted Hard Coated OD4 Bandpass Filters
		Hard Coated OD4 25nm Bandpass Filters	UV Bandpass Filters	Linear Variable Bandpass Filters
			Ultra Narrow Traditional Coated Bandpass Filters
	OD 2.0 Blocking (<1% Transmission) OD 2.0 Filters are typically manufactured from traditional evaporative coating technologies, or absorptive colored glass, yielding cost effective filters.	Infrared Bandpass Filters	Traditional Coated (193-399nm) Bandpass Filters	Traditional Coated Kits
		Everix Ultra-Thin OD 2.0 Bandpass Filters	Everix Ultra-Thin 10nm Bandpass Filters	Colored Glass Bandpass Filters
			Traditional Coated (400 - 699nm) Bandpass Filters	Astronomy Bandpass Filters
			Traditional Coated (700 - 1650nm) Bandpass Filters
			Deep UV Bandpass Filters

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