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
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.