Bandpass Filters - Optometrics

Optometrics

Bandpass Filters

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.

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

Filter terminology — Filter Terminology

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.

Choosing an Optical Filter

Product SKUs

Product Listing

Bandpass Filter Specifications | FL-1064-3-25

CWL	1064 nm	CWL Tolerance	± 0.6 nm
FWHM	3 nm	FWHM Tolerance	± 0.7 nm
Minimum Peak Transmission	45	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
CWL (Range)	1000 – 1099 nm

Bandpass Filter Specifications | F-1310-12-25

CWL	1310 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	40	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1300 – 1399 nm

Bandpass Filter Specifications | F-1320-12-25

CWL	1320 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	40	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1300 – 1399 nm

Bandpass Filter Specifications | F-1330-12-25

CWL	1330 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	40	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1300 – 1399 nm

Bandpass Filter Specifications | F-1340-12-25

CWL	1340 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	40	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1300 – 1399 nm

Bandpass Filter Specifications | F-1480-12-25

CWL	1480 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	35	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1400 – 1499 nm

Bandpass Filter Specifications | F-1490-12-25

CWL	1490 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	35	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1400 – 1499 nm

Bandpass Filter Specifications | F-1510-12-25

CWL	1510 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	35	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1500 – 1599 nm

Bandpass Filter Specifications | F-1520-12-25

CWL	1520 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	35	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1500 – 1599 nm

Bandpass Filter Specifications | F-1530-12-25

CWL	1530 nm	CWL Tolerance	± 2 nm
FWHM	12 nm	FWHM Tolerance	± 2.4 nm
Minimum Peak Transmission	35	Blocking	≥ 4 OD
Blocking Range	200 – 3000 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
CWL (Range)	1500 – 1599 nm