27010 R 26 mm x 38 mm SII 5nm Bandpass Filter by Chroma

The 27010 R 26 mm x 38 mm SII 5nm Bandpass Filter is a high-quality optical component designed for precise wavelength selection, manufactured by the renowned vendor Chroma. This filter is specifically designed for use with the Sodium-II spectral line, with a central wavelength of 670 nm and a full width at half maximum (FWHM) of 5 nm.

The filter is rectangular in shape, with a base size of 26 mm in width and 38 mm in height, providing a substantial active area for light transmission. It has a thickness of 1 mm, ensuring robustness and durability while maintaining minimal optical path difference. The filter is coated on both sides with Chroma's proprietary coating, identified as 'chr 27010', which is designed to enhance transmission and reduce unwanted reflections.

The physical data of the filter specifies a cut-on wavelength of 667.5 nm and a cut-off wavelength of 672.5 nm. This ensures a narrow bandpass, making it ideal for applications that require high spectral purity and rejection of unwanted wavelengths. The cut-on and cut-off wavelengths are defined as the points at which the transmission drops to half its maximum value.

The filter is designed in the shape of a thin lens, which can be beneficial in certain optical systems where a lens function is required in addition to wavelength selection. This filter is currently in stock and available for immediate purchase, as indicated by its weblink status.

For more detailed information and specifications, please refer to the Chroma product page linked below.