39-331 12.5 mm Dia. Hard Coated OD 4.0 5nm Bandpass Filter; t=3.5 mm 515nm

The 39-331 is a Bandpass Filter with a diameter of 12.5 mm, sourced from the reputable optical components vendor, Edmund Optics. This filter is specifically designed for use with a central wavelength of 515nm, 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 39-331'. This coating enhances the filter's durability, making it resistant to wear and tear, a crucial factor for components subjected to frequent handling or those used in harsh environments.

The filter's geometry is defined by a diameter of 12.5 mm and a thickness of 3.5 mm. This thickness ensures the filter's structural integrity while minimizing optical distortions. The filter's base shape is circular, a common and versatile shape in optical systems due to its ease of alignment and integration.

The physical data of the filter includes a cut-on wavelength of 512.5nm and a cut-off wavelength of 517.5nm. These values, combined with the central wavelength, define the filter's passband, the range of wavelengths that the filter allows to pass through. The cut-on and cut-off wavelengths are crucial in determining the filter's selectivity and efficiency.

The filter's coating is designed to optimize its performance at the specified wavelength. The coating on the front surface is the same as that on the back surface, ensuring consistent performance across the entire filter.

The filter's shape is defined as 'Thin Lens', indicating its potential use in lens systems. This shape allows the filter to be easily integrated into existing optical systems, providing the desired wavelength selection without significantly altering the system's overall optical properties.