67-885 50 mm Dia. Mounted Traditional Coated Bandpass Interference Filter; t=3.5 mm 307nm

The 67-885 is a Bandpass Filter with a circular base shape and a 50 mm mounted diameter, sourced from Edmund Optics. This filter is designed to transmit light within a specific range of wavelengths, while blocking other wavelengths, making it ideal for applications that require narrowband spectral filtering.

The filter's central wavelength (CWL) is 307nm, with a full width at half maximum (FWHM) of 10nm. The CWL refers to the wavelength at which the filter's transmittance is maximum, while the FWHM indicates the width of the transmission band at half its maximum transmittance. This specific CWL and FWHM make the filter suitable for applications that require precise spectral filtering around the 307nm wavelength.

The filter's geometry includes a diameter of 50mm and a thickness of 3.5mm. The thickness is crucial in determining the filter's optical path difference, which significantly influences its spectral performance. The filter's material ID is UVFS MAL-1965, but specific details about the material are not provided in the item data.

The physical data of the filter includes a cut-on wavelength of 302nm and a cut-off wavelength of 312nm. The cut-on wavelength is the shortest wavelength that the filter begins to transmit, while the cut-off wavelength is the longest wavelength that the filter ceases to transmit. These values are essential in determining the filter's spectral range.

The filter is coated with EDM 67-751 on both the front and back surfaces. The coating plays a crucial role in enhancing the filter's performance by reducing surface reflections and increasing its durability. The coating also contributes to the filter's overall spectral performance.

The filter's shape is a Thin Lens, which suggests that it is designed to focus light. However, the specific details about the lens's focal length and other optical properties are not provided in the item data.