UV ND Filter system

Ophir-Spiricon, has introduced its new UV ND Filter system product line, a family of modular, slide-in neutral density attenuators and a C-mount holder designed to attenuate UV laser beams so they are at the proper intensity for CCD or pyroelectric cameras in laser test and measurement applications. The filters work on lasers in the 190-380nm wavelength range and cover, for example, excimer, helium cadmium, and Nd:YAG UV harmonic wavelengths.

The UV ND Filters include a C-mount holder for universal application to Ophir-Spiricon's CCD and pyroelectric cameras. Three filter holders are provided with two filters in each holder, facilitating a quick set-up. A holder is slid into the housing slot, and then a click is felt when the filter is properly aligned with the beam. Six filters provide an attenuation range of 0.3 to 6.0 optical densities (OD), permitting best use of the dynamic range of beam profiling cameras. The filters include 0.3, 0.7, 1.0, 2.0, 3.0, and 4.0 OD. Two filters can be used at once for attenuation in 0.3 or 0.4 OD steps.

The UV ND Filters provide a 20mm clear aperture that will not vignette any of the compatible cameras. The damage threshold is 100W/cm2 for CW lasers and 20mJ/cm2 for nanosecond pulse wide lasers. For attenuation of high power UV lasers, the company's LBS-300 Beam Sampler contains a set of the UV ND Filters and measures power levels from 10mW to 400W.