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14ch_LaserBeamDeliveryOptics_reprint.qxd 10/2/2009 10:52 AM Page 14.18 Optical Systems Electronic Shutters Apertures and Spatial Filters Microscope Components Interferometry Accessories Laser Beam-Delivery Optics and Accessories Machine Vision Lenses and Accessories Ask About Our Build-to-Print and Custom Capabilities OEM Shear-Plate Collimation Testers CVI Melles Griot shear plate collimation testers can be used to set the divergence or convergence of a laser collimating system to less than 20 µrad (full angle).These testers can also be used to measure wavefront radius of curvature, determine wavefront symmetry, and measure the power of long-focal-length optics. APPLICATION NOTE Shear-Plate Theory A shear plate is a very simple interferometer; in other words, it is an optical arrangement that combines two wavefronts. Constructive and destructive interference between the two wavefronts leads to a series of light and dark fringes which correspond to in-phase and out-of-phase portions of the wavefronts. $ Testers can be used at all wavelengths in the visible spectrum. $ They test collimation at beam diameters from 5 to 85 mm. $ Both ¼-20 and M6 threaded mounting holes are included. Each shear-plate module consists of a wedged, uncoated optical flat mounted in a black aluminum cube complete with a high-visibility viewing screen and a collimation reference line. To collimate an expanded laser beam, the tester is inserted in the beam and the collimator is adjusted until the fringes observed on the screen are parallel to the reference line. All CVI Melles Griot shear-plate modules follow the same sign convention: a convergent beam produces a clockwise rotation of the fringes on the screen relative to the reference line, whereas a divergent beam produces a counterclockwise rotation (see application note). The high-visibility viewing screen makes it unnecessary to use low ambient lighting to observe the fringes. These shear plates can be used at any wavelength within the visible spectrum. Shear plates are thick, high-quality optical flats. The wavefront or beam to be tested is incident on the shear plate at a 45-degree angle for maximum sensitivity. The uncoated front and rear surfaces generate reflections of almost equal intensity. These reflected wavefronts are said to be “laterally sheared” (i.e., offset with respect to each other) because of the finite thickness of the plate. Interference occurs in the region where the wavefronts overlap. diverging beam converging beam collimated beam Shear-Plate Collimation Testers Clear Aperture (mm) Minimum Usable Beam Diameter (mm) Fringe Rotation Sensitivity* (82%) (mrad) Typical** Collimation Resolution (mrad) Housing Dimensions (mm) 25 50 85 5 10 15 656 230 50 218 76 17 44.5#44.5#53.8 76.2#76.2# 89.2 127.0#127.0 #142.2 PART NUMBER 09 SPM 001 09 SPM 003 09 SPM 005 *Defined as full-angle beam divergence or convergence corresponding to a 10-degree fringe rotation from collimation at 632.8 nm and at full aperture. **Operator-dependent. 14.18 Laser Beam-Delivery Optics and Accessories SPM | 09 SPM www. cvimellesgriot . com