67-843 25 mm Dia. Mounted Traditional Coated Bandpass Interference Filter; t=5.9mm 750nm

The 67-843 is a 25 mm diameter mounted traditional coated bandpass interference filter, with a thickness of 5.9 mm, developed by Edmund Optics. This filter is specifically designed for applications requiring a narrow passband, high transmission, and excellent out-of-band blocking.

The filter's central wavelength (CWL) is 750 nm, with a full width at half maximum (FWHM) of 40 nm. The CWL is the wavelength at which the filter's transmission is maximum, while the FWHM is a measure of the filter's bandwidth. This combination makes the 67-843 ideal for applications where a specific range of wavelengths needs to be isolated or emphasized.

The 67-843 features a cut-on wavelength of 730 nm and a cut-off wavelength of 770 nm. These wavelengths represent the transition points where the filter begins and ends its blocking capabilities, respectively. This means that the filter will block all wavelengths shorter than 730 nm and longer than 770 nm, allowing only the desired wavelengths within this range to pass through.

The filter is coated with EDM 67-776 on both the front and back surfaces. This coating enhances the filter's performance by reducing reflections and increasing transmission. The coating also provides excellent environmental stability, ensuring the filter's properties remain consistent even under varying conditions.

The 67-843 is shaped as a thin lens, making it suitable for use in optical systems where a flat filter would introduce unwanted aberrations. This shape also allows for easy integration into existing setups, simplifying the design and alignment process.