FGL550S 2 in x 2 in Square OG550 Colored Glass Filter; 550nm Longpass

The FGL550S is a color glass filter manufactured by Thorlabs, a leading global supplier of photonics equipment. This particular model boasts a square shape with dimensions of 2 inches by 2 inches and a thickness of 2 millimeters, making it a versatile option for various optical applications.

The filter is designed to transmit light at wavelengths above 550 nanometers, hence its classification as a longpass filter. This characteristic is particularly useful in applications where the goal is to block shorter wavelengths and pass longer ones. The FGL550S is cut on at 550 nanometers, meaning it starts transmitting at this wavelength, and it has no specified cutoff wavelength, indicating that it continues to transmit all longer wavelengths.

The filter's coating is another notable feature. Both the front and back surfaces are coated with Thorlabs' proprietary tho fgl550 coating, which enhances the filter's performance and durability. The filter's shape is classified as a thin lens, suggesting that it may have some light-bending properties, although this is not explicitly stated in the provided data.

In terms of physical data, the filter is made from n-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties. The catalog number for this item is FGL550S, and it is currently in stock, according to Thorlabs' website.