87-824 25 mm Dia. Hard Coated OD 4.0 25nm Bandpass Filter; t=3.5 mm 1050nm

The 87-824 is a Bandpass Filter with a diameter of 25 mm, manufactured by Edmund Optics. This filter is specifically designed for a central wavelength of 1050 nm, making it ideal for applications that require precise wavelength selection within this range.

The filter is constructed with a hard coating on both the front and back surfaces, denoted as 'edm 87-812'. This coating enhances the filter's durability and resistance to environmental factors, ensuring long-lasting performance. The filter's thickness is 3.5 mm, providing sufficient structural integrity for most applications.

The 87-824 features a cut-on wavelength of 1037.5 nm and a cut-off wavelength of 1062.5 nm. These values are crucial in determining the filter's passband, which is the range of wavelengths that the filter allows to pass. The cut-on and cut-off wavelengths, along with the central wavelength, are carefully controlled during the manufacturing process to ensure high-precision performance.

This filter is designed in a circular shape, commonly referred to as a 'Thin Lens' shape in optical terminology. This shape is versatile and can be easily integrated into various optical systems. The filter's diameter of 25 mm provides a large aperture, allowing for efficient light collection and transmission.