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FB3250-500 Dia. 1 in IR Bandpass Filter; CWL=3.25 µm; FWHM=500nm

FB3250-500 Dia. 1 in IR Bandpass Filter; CWL=3.25 µm; FWHM=500nm

Type
Filter
Subtype
Bandpass Filter
Brand
Thorlabs
Product webpage
Thorlabs products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
25.4 mm
Cut Off Frequency
3500 nm
Cut On Frequency
3000 nm

Material

Name
Sapphire ow
Dispersion Equation
Sellmeier
n (λ)
1.7041342779755526
λ
3250 nm
B1
1.4313493
C1
0.005279926 μm2
B2
0.65054713
C2
0.014238265 μm2
B3
5.3414021
C3
325.0178341 μm2

FB3250-500 Dia. 1 in IR Bandpass Filter; CWL=3.25 µm; FWHM=500nm

The FB3250-500 is a high-quality bandpass filter, designed and manufactured by Thorlabs. This particular model is a circular filter, made from sapphire ow mal-1972, and features a diameter of 1 inch and a thickness of 3 millimeters.

The filter is designed to pass wavelengths in the infrared (IR) region of the spectrum, specifically between 3000 and 3500 nanometers, with a central wavelength (CWL) of 3250 nanometers. The full width at half maximum (FWHM) of this filter is 500 nanometers, indicating a relatively broad passband.

The front and back surfaces of the filter are coated with Thorlabs' proprietary coating, designated as 'tho fb3250-500'. This coating enhances the filter's performance and durability.

The filter is available for purchase directly from Thorlabs' website, where it is currently listed as 'in stock'. The product's webpage provides additional technical details and specifications, as well as options for customization and additional accessories.

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