39-307 12.5 mm Dia. Hard Coated OD 4.0 10nm Bandpass Filter; t=3.5 mm 343nm

The 39-307 is a Bandpass Filter with a diameter of 12.5 mm, sourced from the reputable optical components vendor, Edmund Optics. This filter is designed to transmit light within a specific range of wavelengths, while blocking other wavelengths, making it an ideal choice for applications that require narrow-band light.

The filter's central wavelength (CWL) is 343nm, which is the wavelength at which the filter's transmission is maximum. The cut-on wavelength is 338nm, and the cut-off wavelength is 348nm. This means that the filter starts transmitting light at 338nm and stops transmitting at 348nm, effectively passing light in the 343nm range.

The filter is hard coated on both sides with the coatings "edm 39-307", suggesting that it is designed for durability and high performance. The filter's thickness is 3.5mm, which is a standard thickness for optical filters. The filter's geometry is in the shape of a thin lens, which is a common shape for optical filters due to its ease of integration into optical systems.

The filter is made from UVFS Mal-1965, a material known for its excellent optical properties in the ultraviolet range. The filter is available for purchase through the Edmund Optics website, and as of the time of this writing, it is in stock.