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650 US LPF-12.5 12.5 mm Dia. Mounted Ultra-Steep Longpass Filter; t=3mm 650nm

650 US LPF-12.5 12.5 mm Dia. Mounted Ultra-Steep Longpass Filter; t=3mm 650nm

Type
Filter
Subtype
Longpass Filter
Brand
Iridian Spectral Technologies
Product webpage
Iridian Spectral Technologies products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
12.5 mm
Cut Off Frequency
Cut On Frequency
650 nm

Material

Name
UVFS
Dispersion Equation
Sellmeier
n (λ)
1.458448271212196
λ
588 nm
B1
0.6961663
C1
0.004679148 μm2
B2
0.4079426
C2
0.013512063 μm2
B3
0.8974794
C3
97.93400254 μm2

650 US LPF-12.5 12.5 mm Dia. Mounted Ultra-Steep Longpass Filter; t=3mm 650nm

The 650 US LPF-12.5 is a Longpass Filter, a type of optical element designed to transmit light with wavelengths longer than a specified value while blocking shorter wavelengths. This particular model, sourced from Iridian Spectral Technologies, has a catalog number of 650 US LPF and is available for purchase at https://www.iridian.ca/product/650-us-lpf/. The product link is currently valid and indicates that the item is in stock.

The filter is circular in shape with a diameter of 12.5 mm and a thickness of 3 mm. It is made from a material identified as UVFS MAL-1965. The filter's primary function is to cut on at 650 nm, meaning it begins to transmit light at this wavelength, and has a cut off of 0 nm, indicating it blocks all wavelengths shorter than this.

The filter's coating is identical on both the front and back surfaces, both bearing the coating identifier IRR 650-US-LPF. The shape of the filter is described as a Thin Lens, suggesting it may have lens-like properties.

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