Infrared Bandpass Filters

Page 3

Optometrics

Bandpass Filters

A bandpass filter is an inexpensive optical filter used as a wavelength selector that allows transmission of a predetermined wavelength while rejecting or blocking other wavelengths. Along with our wide selection of standard infrared filters, Optometrics designs and manufactures custom bandpass filters for instrument manufacturers world wide.

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Applications

Clinical chemistry instrumentation
Spectral radiometry
Environmental testing
Colorimetry
Elemental and laser line separation
Flame photometry
Color separation
Fluorescence
Immunoassays

Transmission Curve

Optical Bandpass Filter – Typical Transmission Curve

Transmission Curves are graphs or mathematical functions that characterize optical filters. Typically expressed as the percent or fraction of light transmitted versus wavelength.

Bandwidth is a range of wavelength that specifies the transmitted part of the spectrum.
Central Wavelength (CWL) is the midpoint wavelength of the bandwidth.
Peak Transmittance is the maximum percentage of light transmission through the filter. It is often centered at the CWL, but many filters have fairly flat transmittance across the bandwidth.
Half Bandwidth (HBW) or Full Width-Half Maximium (FWHM) is the wavelength range that characterizes a bandpass filter. It is bound by the wavelengths where transmittance is half (50%) that of the peak transmission.
Upper and Lower Blocking Regions are the ranges of wavelengths where the light is attenuated.

Resources

Product SKUs

Bandpass Filter Specifications | F-380-10-12.5

CWL	380 nm	CWL (Range)	300 – 399 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	25
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	12.5 mm dia.	Size Tolerance	+0, -0.2 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	9.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-380-10-25

CWL	380 nm	CWL (Range)	300 – 399 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	25
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	25.0 mm dia.	Size Tolerance	+0, -0.1 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	21.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-390-10-12.5

CWL	390 nm	CWL (Range)	300 – 399 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	25
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	12.5 mm dia.	Size Tolerance	+0, -0.2 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	9.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-390-10-25

CWL	390 nm	CWL (Range)	300 – 399 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	25
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	25.0 mm dia.	Size Tolerance	+0, -0.1 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	21.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-394-10-12.5

CWL	394 nm	CWL (Range)	300 – 399 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	35
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	12.5 mm dia.	Size Tolerance	+0, -0.2 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	9.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-400-10-12.5

CWL	400 nm	CWL (Range)	400 – 499 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	35
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	12.5 mm dia.	Size Tolerance	+0, -0.2 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	9.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-400-10-25

CWL	400 nm	CWL (Range)	400 – 499 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	35
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	25.0 mm dia.	Size Tolerance	+0, -0.1 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	21.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-400-40-25

CWL	400 nm	CWL (Range)	400 – 499 nm
CWL Tolerance	± 8 nm	FWHM	40 nm
FWHM Tolerance	± 8 nm	Minimum Peak Transmission	40
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	25.0 mm dia.	Size Tolerance	+0, -0.1 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	21.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles	Optical Quality	Commercial

Bandpass Filter Specifications | F-405-10-12.5

CWL	405 nm	CWL (Range)	400 – 499 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	45
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	12.5 mm dia.	Size Tolerance	+0, -0.2 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	9.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Operating Temperature Range	-50° C to +70° C	Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles
Optical Quality	Commercial

Bandpass Filter Specifications | F-405-10-25

CWL	405 nm	CWL (Range)	400 – 499 nm
CWL Tolerance	± 2 nm	FWHM	10 nm
FWHM Tolerance	± 2 nm	Minimum Peak Transmission	37
Blocking	≥ 4 OD	Blocking Range	X-ray – 1200 nm
Size (mm)	25.0 mm dia.	Size Tolerance	+0, -0.1 mm
Thickness	7.5 mm	Thickness Tolerance	+0, -0.2 mm
Clear Aperture	21.0 mm	Mount	Aluminum, Black Anodized
Ring Marking	CWL, FWHM, Light Direction	Specification Temperature	23˚ C
Operating Temperature Range	-50° C to +70° C	Humidity Resistance	MIL-810-810E, Method 507.3, 5 Cycles
Optical Quality	Commercial

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