87-741 12.5 mm Dia. Hard Coated Fluorescence Bandpass Filter; t=2 mm 661nm

The 87-741 is a Bandpass Filter, specifically designed for Fluorescence applications, available from Edmund Optics. This filter boasts a 12.5 mm diameter and a thickness of 2 mm, making it a robust and compact solution for various optical setups.

The filter is designed to transmit light within a specific wavelength range, centered at 661nm, with a bandwidth of 20nm. This is achieved through the use of a hard coating, denoted as 'edm 87-741' on both the front and back surfaces. This coating not only ensures the desired wavelength transmission but also provides a high level of optical density (OD 6) outside the passband, effectively blocking unwanted light.

The 87-741 filter is cut on at 651nm and cut off at 671nm, ensuring a sharp transition between the passband and the blocked wavelengths. This precise control over the transmission range is crucial in many fluorescence applications, where specific wavelengths need to be isolated or enhanced.

The filter is shaped as a Thin Lens, which can be beneficial in certain optical configurations, providing improved light collection or focusing capabilities. The catalog number for this item is 87-741, and it is currently in stock, according to the vendor's website.