490FDS25 25 mm Dia. Shortpass Dichroic Filter 490nm
- Type
- Filter
- Subtype
- Dichroic Filter
- Brand
- Knight Optical
Properties
- Shape
- Circular
- Diameter
- 25 mm
- 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
490FDS25 25 mm Dia. Shortpass Dichroic Filter 490nm
The 490FDS25 is a high-quality dichroic filter, supplied by Knight Optical, designed for shortpass applications with a 490nm cutoff wavelength. This filter is circular in shape, featuring a 25mm diameter and a thickness of 1.1mm, making it suitable for a wide range of optical systems.
The filter is made from N-BK7 Schott glass, a popular material due to its excellent optical properties and high damage threshold. The 490FDS25 boasts a cut-on wavelength of 932nm, ensuring efficient transmission of shorter wavelengths while effectively blocking longer wavelengths.
The dichroic coating on both the front and back surfaces of the filter is identified as 'kni 490fds-0'. This coating is specifically designed to provide the desired shortpass characteristics, ensuring optimal performance in your optical system.
The filter is shaped as a thin lens, which can be beneficial in certain applications where minimal thickness is required. The 490FDS25 is currently in stock and available for immediate purchase through the Knight Optical website.
