490FDS50 50 x 50 mm Shortpass Dichroic Filter 490nm
- Type
- Filter
- Subtype
- Dichroic Filter
- Brand
- Knight Optical
Properties
- Shape
- Rectangular
- Cut Off Frequency
- 490 nm
- Cut On Frequency
- 932 nm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5167817367777034
- λ
- 588 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
490FDS50 50 x 50 mm Shortpass Dichroic Filter 490nm
The 490FDS50 is a high-quality dichroic filter, measuring 50 x 50 mm, designed for shortpass applications with a cutoff wavelength of 490nm. This filter is sourced from Knight Optical, a renowned vendor known for their extensive catalog of optical elements.
The filter is made from N-BK7 Schott, a popular optical glass due to its excellent homogeneity, low auto-fluorescence, and high damage threshold. The filter's geometry includes a thickness of 1.1mm, making it suitable for a wide range of optical applications.
The 490FDS50 features a dichroic coating on both the front and back surfaces, specifically the KNI 490FDS-0 coating. This coating is designed to reflect wavelengths shorter than 490nm and transmit wavelengths longer than 490nm. The cut-on wavelength is 932nm, indicating that wavelengths shorter than this will be reflected.
This filter is rectangular in shape and has a thin lens design. It is currently in stock and available for purchase on Knight Optical's website. For more information, users can visit the provided weblink.
