Square Bandpass Filters

Our 2 x 2 in. square bandpass filters pass a narrow spectral band of UV, visible, or NIR radiation and reject out-of-band wavelengths from X-ray to the far IR. Applications include spectra radiometry, medical diagnostics, chemical analysis, colorimetry, astronomy, or any application where spectral isolation is required.

Out-of-band blocking to less than 0.01% (10-4)
Center wavelengths available from 310 nm to 900 nm
50.8 x 50.8 mm square shape
Superior lifetime in harsh environmental conditions
Excellent temperature stability

See All Features

Show Filters:

Showing 57 of 57 total products

Compatibility:

Description	Compatibility	Center Wavelength	FWHM	Minimum Peak Transmission	Avail.	Price
20BPF10-340Bandpass Filter, 50.8x50.8 mm, 340±2 nm Center, 12±2 nm FWHM	UNIVERSAL	340 nm	12±2 nm	35%	4 Weeks	$872
20BPF10-350Bandpass Filter, 50.8x50.8 mm, 350±2 nm Center, 11±2 nm FWHM	UNIVERSAL	350 nm	11±2 nm	30%	In Stock	$872
20BPF10-360Bandpass Filter, 50.8x50.8 mm, 360±2 nm Center, 11±2 nm FWHM	UNIVERSAL	360 nm	11±2 nm	30%	4 Weeks	$872
20BPF10-370Bandpass Filter, 50.8x50.8 mm, 370±2 nm Center, 12±2 nm FWHM	UNIVERSAL	370 nm	12±2 nm	30%	4 Weeks	$872
20BPF10-380Bandpass Filter, 50.8x50.8 mm, 380±2 nm Center, 12±2 nm FWHM	UNIVERSAL	380 nm	12±2 nm	30%	In Stock	$872
20BPF10-390Bandpass Filter, 50.8x50.8 mm, 390±2 nm Center, 12±2 nm FWHM	UNIVERSAL	390 nm	12±2 nm	30%	4 Weeks	$872
20BPF10-400Bandpass Filter, 50.8x50.8 mm, 400±2 nm Center, 10±2 nm FWHM	UNIVERSAL	400 nm	10±2 nm	30%	4 Weeks	$477
20BPF10-410Bandpass Filter, 50.8x50.8 mm, 410±2 nm Center, 10±2 nm FWHM	UNIVERSAL	410 nm	10±2 nm	45%	4 Weeks	$477
20BPF10-420Bandpass Filter, 50.8x50.8 mm, 420±2 nm Center, 10±2 nm FWHM	UNIVERSAL	420 nm	10±2 nm	45%	In Stock	$477
20BPF10-430Bandpass Filter, 50.8x50.8 mm, 430±2 nm Center, 10±2 nm FWHM	UNIVERSAL	430 nm	10±2 nm	45%	In Stock	$482
20BPF10-440Bandpass Filter, 50.8x50.8 mm, 440±2 nm Center, 10±2 nm FWHM	UNIVERSAL	440 nm	10±2 nm	45%	In Stock	$477
20BPF10-450Bandpass Filter, 50.8x50.8 mm, 450±2 nm Center, 10±2 nm FWHM	UNIVERSAL	450 nm	10±2 nm	45%	6 Weeks	$477
20BPF10-460Bandpass Filter, 50.8x50.8 mm, 460±2 nm Center, 10±2 nm FWHM	UNIVERSAL	460 nm	10±2 nm	50%	In Stock	$451
20BPF10-470Bandpass Filter, 50.8x50.8 mm, 470±2 nm Center, 10±2 nm FWHM	UNIVERSAL	470 nm	10±2 nm	50%	6 Weeks	$452
20BPF10-480Bandpass Filter, 50.8x50.8 mm, 480±2 nm Center, 10±2 nm FWHM	UNIVERSAL	480 nm	10±2 nm	50%	In Stock	$451
20BPF10-490Bandpass Filter, 50.8x50.8 mm, 490±2 nm Center, 10±2 nm FWHM	UNIVERSAL	490 nm	10±2 nm	50%	6 Weeks	$451
20BPF10-500Bandpass Filter, 50.8x50.8 mm, 500±2 nm Center, 10±2 nm FWHM	UNIVERSAL	500 nm	10±2 nm	50%	In Stock	$451
20BPF10-510Bandpass Filter, 50.8x50.8 mm, 510±2 nm Center, 10±2 nm FWHM	UNIVERSAL	510 nm	10±2 nm	50%	6 Weeks	$451
20BPF10-520Bandpass Filter, 50.8x50.8 mm, 520±2 nm Center, 10±2 nm FWHM	UNIVERSAL	520 nm	10±2 nm	50%	In Stock	$453
20BPF10-530Bandpass Filter, 50.8x50.8 mm, 530±2 nm Center, 10±2 nm FWHM	UNIVERSAL	530 nm	10±2 nm	50%	In Stock	$451
20BPF10-540Bandpass Filter, 50.8x50.8 mm, 540±2 nm Center, 10±2 nm FWHM	UNIVERSAL	540 nm	10±2 nm	50%	6 Weeks	$427
20BPF10-550Bandpass Filter, 50.8x50.8 mm, 550±2 nm, 10±2 nm FWHM	UNIVERSAL	550 nm	10±2 nm	50%	6 Weeks	$451
20BPF10-560Bandpass Filter, 50.8x50.8 mm, 560±2 nm, 10±2 nm FWHM	UNIVERSAL	560 nm	10±2 nm	50%	In Stock	$451
20BPF10-570Bandpass Filter, 50.8x50.8 mm, 570±2 nm, 10±2 nm FWHM	UNIVERSAL	570 nm	10±2 nm	50%	In Stock	$451
20BPF10-580Bandpass Filter, 50.8x50.8 mm, 580±2 nm, 10±2 nm FWHM	UNIVERSAL	580 nm	10±2 nm	50%	6 Weeks	$451
20BPF10-590Bandpass Filter, 50.8x50.8 mm, 590±2 nm, 10±2 nm FWHM	UNIVERSAL	590 nm	10±2 nm	50%	6 Weeks	$451
20BPF10-600Bandpass Filter, 50.8x50.8 mm, 600±2 nm, 10±2 nm FWHM	UNIVERSAL	600 nm	10±2 nm	50%	In Stock	$451
20BPF10-610Bandpass Filter, 50.8x50.8 mm, 610±2 nm, 10±2 nm FWHM	UNIVERSAL	610 nm	10±2 nm	50%	In Stock	$446
20BPF10-620Bandpass Filter, 50.8x50.8 mm, 620±2 nm, 10±2 nm FWHM	UNIVERSAL	620 nm	10±2 nm	50%	In Stock	$452
20BPF10-630Bandpass Filter, 50.8x50.8 mm, 630±2 nm, 10±2 nm FWHM	UNIVERSAL	630 nm	10±2 nm	50%	In Stock	$446
20BPF10-640Bandpass Filter, 50.8x50.8 mm, 640±2 nm, 10±2 nm FWHM	UNIVERSAL	640 nm	10±2 nm	50%	In Stock	$451
20BPF10-650Bandpass Filter, 50.8x50.8 mm, 650±2 nm, 10±2 nm FWHM	UNIVERSAL	650 nm	10±2 nm	50%	In Stock	$451
20BPF10-660Bandpass Filter, 50.8x50.8 mm, 660±2 nm, 11±2 nm FWHM	UNIVERSAL	660 nm	11±2 nm	50%	In Stock	$451
20BPF10-670Bandpass Filter, 50.8x50.8 mm, 670±2 nm, 11±2 nm FWHM	UNIVERSAL	670 nm	11±2 nm	50%	In Stock	$451
20BPF10-680Bandpass Filter, 50.8x50.8 mm, 680±2 nm, 11±2 nm FWHM	UNIVERSAL	680 nm	11±2 nm	50%	In Stock	$451
20BPF10-690Bandpass Filter, 50.8x50.8 mm, 690±2 nm, 11±2 nm FWHM	UNIVERSAL	690 nm	11±2 nm	50%	6 Weeks	$451
20BPF10-700Bandpass Filter, 50.8x50.8 mm, 700±2 nm, 12±2 nm FWHM	UNIVERSAL	700 nm	12±2 nm	50%	6 Weeks	$451
20BPF10-750Bandpass Filter, 50.8x50.8 mm, 750±2 nm, 13±2 nm FWHM	UNIVERSAL	750 nm	13±2 nm	50%	In Stock	$451
20BPF10-800Bandpass Filter, 50.8x50.8 mm, 800±2 nm, 12±2 nm FWHM	UNIVERSAL	800 nm	12±2 nm	45%	6 Weeks	$451
20BPF10-850Bandpass Filter, 50.8x50.8 mm, 850±2 nm, 13±2 nm FWHM	UNIVERSAL	850 nm	13±2 nm	45%	In Stock	$451
20BPF10-900Bandpass Filter, 50.8x50.8 mm, 900±2 nm, 10±2 nm FWHM	UNIVERSAL	900 nm	10±2 nm	45%	In Stock	$451
20BPF25-400Bandpass Filter, 50.8x50.8 mm, 400±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	400 nm	25±3.5 nm	35%	In Stock	$476
20BPF25-450Bandpass Filter, 50.8x50.8 mm, 450±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	450 nm	25±3.5 nm	45%	In Stock	$499
20BPF25-500Bandpass Filter, 50.8x50.8 mm, 500±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	500 nm	25±3.5 nm	50%	In Stock	$472
20BPF25-550Bandpass Filter, 50.8x50.8 mm, 550±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	550 nm	25±3.5 nm	50%	In Stock	$480
20BPF25-600Bandpass Filter, 50.8x50.8 mm, 600±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	600 nm	25±3.5 nm	50%	In Stock	$472
20BPF25-650Bandpass Filter, 50.8x50.8 mm, 650±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	650 nm	25±3.5 nm	50%	6 Weeks	$451
20BPF25-700Bandpass Filter, 50.8x50.8 mm, 700±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	700 nm	25±3.5 nm	50%	In Stock	$480
20BPF25-750Bandpass Filter, 50.8x50.8 mm, 750±3.5 nm, 25±3.5 nm FWHM	UNIVERSAL	750 nm	25±3.5 nm	50%	6 Weeks	$451
20BPF70-400Bandpass Filter, 50.8x50.8 mm, 400±10 nm, 70±30 nm FWHM	UNIVERSAL	400 nm	70±30 nm	60%	In Stock	$372
20BPF70-450Bandpass Filter, 50.8x50.8 mm, 450±10 nm, 70±30 nm FWHM	UNIVERSAL	450 nm	70±30 nm	60%	In Stock	$371
20BPF70-500Bandpass Filter, 50.8x50.8 mm, 500±10 nm, 70±30 nm FWHM	UNIVERSAL	500 nm	70±30 nm	60%	In Stock	$371
20BPF70-550Bandpass Filter, 50.8x50.8 mm, 550±10 nm, 70±30 nm FWHM	UNIVERSAL	550 nm	70±30 nm	60%	In Stock	$371
20BPF70-600Bandpass Filter, 50.8x50.8 mm, 600±10 nm, 70±30 nm FWHM	UNIVERSAL	600 nm	70±30 nm	60%	In Stock	$371
20BPF70-650Bandpass Filter, 50.8x50.8 mm, 650±10 nm, 70±30 nm FWHM	UNIVERSAL	650 nm	70±30 nm	60%	In Stock	$371
20BPF70-700Bandpass Filter, 50.8x50.8 mm, 700±10 nm, 70±30 nm FWHM	UNIVERSAL	700 nm	70±30 nm	60%	In Stock	$371
20BPF70-750Bandpass Filter, 50.8x50.8 mm, 750±10 nm, 70±30 nm FWHM	UNIVERSAL	750 nm	70±30 nm	60%	6 Weeks	$371

Show Less

Specifications

Type
Bandpass Filter
Size
50.8 x 50.8 mm
Surface Quality
80-50 scratch-dig

Humidity Resistance
Per MIL-STD-810E, method 507.3, procedure III, modified to 5 cycles
Temperature Range
-50 to 100°C
Wavelength Shift with Temperature
0.01 to 0.02 nm/°C

Features

Scribed and Laminated Construction

Scribed and laminated soft coating construction is a commonly used construction for bandpass and edge filters. Optical filter components are coated onto separate substrate plates. These plates are then scribed to remove the film symmetrically around the required specified active film areas of the optical filters to be produced from the plate. The scribed plates are subsequently laminated together with a moisture resistant epoxy. A glass-epoxy-glass seal is formed in the scribed areas forming the best possible barrier to moisture penetration. Filters are cut through the scribed area to their finished size using diamond cutting tools. Additional moisture barriers may be applied to the cut filters if necessary to achieve extended life requirements.

Bandpass Filter Transmission Curves

A bandpass filter is defined by the pass band region. The two wavelengths in the bandpass where the transmittance is equal to 50% of peak transmittance are called the half-power wavelengths. The bandwidth is the difference between the half-power wavelengths which is called the full width at half maximum (FWHM). A center wavelength is defined by calculating the average of the two half-power wavelengths. The band shape is usually defined as a multiple of the BW or FWHM, and it defines the rate of attenuation with respect to wavelength change along the slopes of the bandpass. Please see the individual product page for the transmission curve.