87-821 12.5 mm Dia. Hard Coated OD 4.0 25nm Bandpass Filter; t=3.5 mm 1500nm

The 87-821 is a Bandpass Filter with a diameter of 12.5 mm, sourced from the reputable vendor, Edmund Optics. This filter is specifically designed for use with a central wavelength (CWL) of 1500nm, making it ideal for applications that require precise wavelength selection within this range.

The filter boasts a hard coating on both the front and back surfaces, denoted as 'edm 87-821'. This coating enhances the filter's durability, making it resistant to scratches and other forms of damage, thereby ensuring longevity and reliable performance.

The physical data of the filter is equally impressive. It has a cut-on wavelength of 1487.5nm and a cut-off wavelength of 1512.5nm. This narrow bandwidth of 25nm, combined with the CWL, allows for efficient filtering of unwanted wavelengths, thereby enhancing the signal-to-noise ratio in your optical system.

The filter's geometry is another notable feature. It has a thickness of 3.5mm, which provides sufficient mechanical stability for most applications. The circular shape, often referred to as a 'Thin Lens', ensures easy integration into your optical setup.

In conclusion, the 87-821 12.5 mm Dia. Hard Coated OD 4.0 25nm Bandpass Filter; t=3.5 mm 1500nm is a robust and high-performance optical component, perfect for applications that demand precise wavelength selection and durability.