MF445-45 25 mm Dia. WGFP Excitation Filter; CWL=445nm; BW=45nm

The MF445-45 is a 25 mm diameter Bandpass Filter, specifically designed for excitation purposes, offered by Thorlabs. This filter is characterized by a center wavelength (CWL) of 445 nm and a bandwidth (BW) of 45 nm, making it ideal for applications that require narrowband light transmission around this wavelength.

The filter is made from UVFS, a high-quality optical material with a refractive index of 1.458 at 587.6 nm, ensuring excellent optical performance. It features a circular shape, with a thickness of 5 mm, providing robustness and ease of integration into various optical systems.

The MF445-45 filter's coating is a crucial aspect of its design. Both the front and back surfaces are coated with a unique Thorlabs coating (tho mf445-45), which enhances its performance by controlling the reflection and transmission of light. This coating ensures high transmission at the desired wavelength and low transmission at other wavelengths, making it an excellent choice for applications that require precise wavelength selection.

The physical data of the filter indicates a cut-on wavelength of 422.5 nm and a cut-off wavelength of 467.5 nm. This means that the filter starts transmitting at 422.5 nm and stops transmitting at 467.5 nm, effectively passing light in the 445 nm range.

In terms of geometry, the filter has a diameter of 25 mm, providing a generous aperture for light to pass through. The thickness of 5 mm ensures structural integrity while minimizing optical distortions. The shape of the filter is thin lens, which is beneficial for applications that require focusing or collimating light.

The filter is currently in stock and available for purchase through the Thorlabs website. For more information, please refer to the provided weblink.