FGB18 Dia. 25 mm BG18 Colored Glass Bandpass Filter; 412-569nm

The FGB18 is a color glass bandpass filter, designed and manufactured by Thorlabs, a leading global supplier of photonics equipment. This filter is part of Thorlabs' extensive catalog of optical elements, which 3DOptix integrates into its advanced optical simulation software.

The FGB18 filter has a circular shape with a diameter of 25 mm and a thickness of 2 mm. It is made from n-bk7 Schott, a high-quality optical glass known for its excellent transmission and low auto-fluorescence. The filter is designed to pass wavelengths between 412 and 569 nm, making it ideal for applications that require narrow-band light in this spectrum.

The filter's coating is another notable feature. Both the front and back surfaces are coated with the THo FGB18 coating, which enhances the filter's performance and durability. This coating helps to ensure high transmission, low reflection, and resistance to environmental factors such as dust and moisture.

The FGB18 filter is available in a thin lens shape, which is advantageous for applications where space is limited or a flat surface is required. The filter's physical data indicates that it is cut on at 412 nm and cut off at 569 nm, providing a precise and consistent passband.