39-305 12.5 mm Dia. Hard Coated OD 4.0 10nm Bandpass Filter; t=2 mm 254nm

The 39-305 is a Bandpass Filter with a diameter of 12.5 mm, sourced from the reputable optical vendor, Edmund Optics. This filter is specifically designed for use with a central wavelength of 254 nm, making it ideal for applications that require precise filtering within this spectrum.

The filter is constructed with a hard coating on both the front and back surfaces, denoted as 'edm 39-305'. This coating enhances the durability and longevity of the filter, making it suitable for use in various environments. The filter's thickness is 2 mm, providing sufficient structural integrity while maintaining minimal optical distortion.

The 39-305 features a cut-on wavelength of 249 nm and a cut-off wavelength of 259 nm, ensuring a tight bandpass around the central wavelength. This characteristic is particularly beneficial in applications where stray light or out-of-band radiation needs to be minimized.

The filter is designed in a circular shape, a common form factor for optical elements, and has a Thin Lens shape. This shape allows for easy integration into various optical systems. The filter's geometry is defined by its 12.5 mm diameter, providing a generous aperture for light transmission.

In terms of availability, the 39-305 is currently in stock, according to the vendor's website link provided: https://www.edmundoptics.com/p/254nm-cwl-125mm-dia-hard-coated-od-4-10nm-bandpass-filter/40054/. This information is subject to change, so it's recommended to check the vendor's website for the most up-to-date status.