690FIB12 12.5 mm Dia. Standard Interference Bandpass Filter 690nm
- Type
- Filter
- Subtype
- Bandpass Filter
- Brand
- Knight Optical
Properties
- Shape
- Circular
- Diameter
- 12.5 mm
- Cut Off Frequency
- 695 nm
- Cut On Frequency
- 685 nm
Material
- Name
- UVFS
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.4555240712100141
- λ
- 690 nm
- B1
- 0.6961663
- C1
- 0.004679148 μm2
- B2
- 0.4079426
- C2
- 0.013512063 μm2
- B3
- 0.8974794
- C3
- 97.93400254 μm2
690FIB12 12.5 mm Dia. Standard Interference Bandpass Filter 690nm
The 690FIB12 is a 12.5 mm diameter Standard Interference Bandpass Filter, specifically designed to center at a wavelength of 690nm. This filter is sourced from Knight Optical, a reputable vendor known for their high-quality optical elements.
The filter is a Bandpass type, which means it allows transmission of light within a specific range of wavelengths while blocking other wavelengths. In this case, the cut-on wavelength is 685nm, and the cut-off wavelength is 695nm, making it highly efficient at filtering out unwanted wavelengths around the central 690nm.
The filter is made from UVFS Mal-1965, a material known for its optical properties and durability. It has a Thin Lens shape, which is beneficial for applications that require minimal optical path deviation. The filter's thickness is 6.1mm, providing sufficient structural integrity while maintaining minimal impact on the optical path.
The coating on both the front and back surfaces of the filter is KNI 690DIB. This coating is specifically designed to enhance the filter's performance, ensuring high transmission efficiency and excellent wavelength selectivity.
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