Airslits & Pinholes
Precision air slits serve a variety of uses in image scanning or dissection systems and physical optic, x-ray and spectrographic applications. Slits scanned across the focal point of a system allow the user to map the linespread function of the incident beam and calculate MTF. They find other applications as entrance and exit image slits in spectrophotometers and can be integrated into alignment and mapping systems.
JML offers a selection of electroformed, nickel air slits free of pinhole defects and whose dimensions (length, width) and side-to-side parallelism are precisely controlled. Unlike chemically milled and laser machined parts, electroformed parts have openings, edges and corners that are sharp, smooth, clean and burr free. These air slits can be used at any wavelength because their performance is not dependent on vacuum-deposited thin films.
Precision pinholes or round apertures are useful as spatial filters when placed at the focus of a laser light condensing system. Larger diameter pinholes can be used as beam reducers (laser applications) for alignment or scanning applications. Like their counterpart air slits, JML’s electroformed, nickel air pinholes are free of edge and coating induced defects. They are useful at all wavelengths because their performance is not dependent on vacuum-deposited thin films.
Pinholes should be selected to suit the 1/e2 diameter of the beam, thereby passing only the central maximum of the diffraction pattern and eliminating sideband spatial noise.
Our air slits and pinholes are supplied with a mirror-like finish on one side and a flat, dull finish on the other. JML also offers similar size pinholes and slits made with chrome-on-glass. The chrome, approximately 3000 angstroms thick, is vacuum deposited on 13mm diameter glass substrates. The optical density of the chrome coating is a minimum of 4. All air slits and pinholes, as well as chrome-on-glass versions, are available unmounted or precision mounted in black anodized aluminum holders. The 1.6mm thick and 16mm round holders have the opening size of the mounted aperture marked on the external surface of the holder.
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