NENIR05B-C Dia. 25 mm Unmounted AR-Coated Absorptive Neutral Density Filter; 1050 - 1700nm; OD 0.5 AR 1050-1700nm

The NENIR05B-C is a circular, unmounted neutral density filter, designed with a diameter of 25 mm and a thickness of 0.8 mm. This filter, sourced from Thorlabs, is a part of their extensive catalog, and it is specifically designed for use in the infrared spectrum, between 1050 and 1700nm.

The NENIR05B-C filter is an absorptive type, meaning it reduces the intensity of incident light by absorbing it rather than reflecting or scattering it. This absorption is uniform across the filter's surface, ensuring consistent attenuation of the light beam. The filter's optical density (OD) is 0.5, indicating a 70.71% transmission rate, making it suitable for applications requiring moderate light reduction.

The filter's coating is another notable feature. Both the front and back surfaces are coated with the THo NENIR05A-C coating, which is optimized for the 1050-1700nm wavelength range. This anti-reflective (AR) coating reduces surface reflections, thereby minimizing losses and improving overall transmission.

The NENIR05B-C filter is designed in a thin lens shape, which can be beneficial in certain optical systems where space is a constraint. However, it is important to note that this filter is unmounted, meaning it does not come with any housing or mounting mechanism. Users will need to source or fabricate a suitable mount for this filter based on their specific application requirements.