RSF-25C-980RU 25 mm Dia. Mounted Raman Longpass Edge Filter; t=3.5mm 980nm

The RSF-25C-980RU is a 25 mm diameter mounted Raman longpass edge filter, designed and manufactured by OptoSigma. This filter is specifically engineered for applications that require the blocking of wavelengths below 980 nm, while transmitting longer wavelengths.

The filter is constructed with a base shape of a circle, a common geometry in optical components due to its symmetry and ease of integration into various systems. The filter's diameter measures 25 mm, providing a substantial surface area for light transmission. The thickness of the filter is 3.5 mm, offering robustness and stability in its mounting.

The RSF-25C-980RU features a unique coating on both the front and back surfaces, denoted as 'opt rsf-980ru'. This coating is specifically designed to enhance the filter's performance, ensuring efficient blocking of unwanted wavelengths and high transmission of desired wavelengths.

The physical data of the filter indicates a cut-on wavelength of 980 nm, meaning it starts to transmit at this wavelength. The cut-off wavelength is 0 nm, indicating that it blocks all wavelengths shorter than 980 nm. This makes it an ideal choice for Raman spectroscopy applications, where the Raman signal is often very weak and needs to be distinguished from the strong Rayleigh scattering.