67-022 12.5 mm Dia. Hard Coated Fluorescence Bandpass Filter; t=2 mm 640.5nm

The 67-022 is a high-quality Bandpass Filter, sourced from the reputable optical components vendor, Edmund Optics. This filter, with a diameter of 12.5 mm, is designed to transmit light within a specific range of wavelengths, making it ideal for various applications where control over the spectral bandwidth is crucial.

The filter's primary wavelength is 640.5 nm, which is located in the red region of the visible light spectrum. This wavelength is commonly used in fluorescence applications, where it can excite certain fluorophores to emit light at longer wavelengths. The filter's cut-on wavelength is 600 nm, and the cut-off wavelength is 681 nm, providing a bandwidth of 75 nm. This means that the filter will allow light between 600 nm and 681 nm to pass through, while blocking light outside this range.

The 67-022 filter is made from UVFS Mal-1965, a material known for its excellent optical properties. The filter has a thickness of 2 mm, which provides sufficient mechanical strength while minimizing optical distortions. The front and back surfaces of the filter are hard coated with EDM 67-022, a coating that enhances the filter's durability and resistance to environmental factors.

The filter's shape is that of a thin lens, which is designed to minimize optical aberrations and ensure that the transmitted light is as close to the ideal plane wave as possible. This makes the 67-022 filter suitable for use in imaging systems, spectroscopy, and other applications where high-quality, monochromatic light is required.