521FDN25 25 mm Dia. Bandblocking Dichroic Filter 521nm
- Type
- Filter
- Subtype
- Dichroic Filter
- Brand
- Knight Optical
Properties
- Shape
- Circular
- Diameter
- 25 mm
- Cut Off Frequency
- 470 nm
- Cut On Frequency
- 572 nm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.52010065619205
- λ
- 521 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
521FDN25 25 mm Dia. Bandblocking Dichroic Filter 521nm
The 521FDN25 is a Dichroic Filter, specifically designed for bandblocking applications, with a diameter of 25 mm. This filter, available from Knight Optical, is a high-quality, reliable component for various optical systems.
The filter's primary function is to block light in the 470-572nm range while allowing light at the center wavelength (CWL) of 521nm to pass through. This makes it ideal for applications where specific wavelengths need to be isolated or blocked.
The 521FDN25 is made from N-BK7 Schott, a widely used optical glass due to its excellent optical properties and durability. The filter has a thickness of 1.1mm, providing sufficient structural integrity while minimizing optical distortions.
The coating on both the front and back surfaces of the filter is KNI 521FDN-0. This coating enhances the filter's performance, ensuring efficient light transmission at the desired wavelength and effective blockage of unwanted wavelengths.
The filter's geometry is that of a thin lens, which can be beneficial in certain optical system designs. The 521FDN25 is currently in stock and available for immediate purchase through the Knight Optical website.