FGL280M Dia. 25 mm SM1-Mounted Colored Glass Filter; 280nm Longpass

The FGL280M is a color glass filter, offered by Thorlabs, with a catalog number FGL280M. This filter is designed with a base shape of a circle, featuring a diameter of 25 mm and a thickness of 2 mm. The material used in the construction of this filter is n-bk7 schott, a well-regarded optical glass.

The FGL280M filter is characterized by its longpass wavelength of 280 nm. This means it allows transmission of light at wavelengths equal to or greater than 280 nm, while effectively blocking shorter wavelengths. The cut-on wavelength, which is the point at which the filter starts to transmit light, is set at 280 nm. The cut-off wavelength, the point at which the filter stops transmitting light, is 0 nm, indicating that it transmits all wavelengths longer than its cut-on wavelength.

This filter features coatings on both the front and back surfaces. The front coating is identified as 'tho fgl280', and the back coating is also 'tho fgl280'. These coatings play a crucial role in the filter's performance, enhancing its transmission characteristics and overall optical quality.

The FGL280M filter is designed with a shape similar to a thin lens, making it compatible with various optical systems. According to the vendor's information, this filter is currently in stock and available for immediate purchase, as indicated by its weblink status of 'Valid - in stock'.