FSR-RG645 25.4 mm Dia. Colored Glass Absorptive Longpass Filter 645nm

The FSR-RG645 is a Longpass Filter, specifically designed for use in optical systems that require effective wavelength management. This filter, sourced from the reputable vendor MKS/Newport, is a circular element with a diameter of 25.4 mm and a thickness of 3 mm, ensuring a robust and stable integration into your setup.

The filter's primary function is to allow light with wavelengths greater than or equal to 645 nm to pass through while blocking shorter wavelengths. This is achieved through the use of a specialized coating, referred to as "new rg645", on both the front and back surfaces. The cut-on wavelength is 645 nm, and there is no specified cut-off wavelength, indicating that it blocks all wavelengths shorter than 645 nm.

The FSR-RG645 is shaped as a Thin Lens, suggesting that it may have some light-bending properties, which could be beneficial in certain applications. The material ID for this filter is UVFS MAL-1965, although the specific composition of the material is not detailed in the provided data.

The filter is currently in stock and available for purchase through the Newport website, as indicated by the "weblink status" field. For more detailed information, you can refer to the catalog number FSR-RG645 on the Newport website.