OPTICAL COMPONENTS Beam Samplers Spherical Lenses Cylindrical Lenses Lens Kits Provides a 5% reflected sample of the entire beam Highly efficient Anti-Reflection coating on the second surface to eliminate ghosts Available in four standard diameters Wedged second surface also available for highly demanding applications Surfaces finished to λ/10 flatness Standard diameters from 25.4 to 50.8mm Achromatic Doublets Multi-Element Micro Optics Mirrors Prisms Substrates & Windows Beamsplitters Polarizers Filter & Apertures About 5% of a beam incident at 45 degrees is reflected from one surface of these BK7 beam samplers. The faces are parallel to within 5arcsec with a highly effective Anti-Reflection coating on the second surface. This coating eliminates virtually all ghost image problems. The 5% reflected beam is useful for diagnostic sampling or monitoring of the optical beam. Sampling a beam is an effective way of providing feedback information for stabilization or calibration. Often one is tempted to insert Specifications & Tolerances a small plane mirror in an unused or Surface flatness: λ/10 Diameter: +0, -0.2mm Surface quality: 20-10 Parallelism: ≤5arcsec or 1° wedge Thickness: ±0.2mm Clear aperture: >90% diameter Bevel: 0.2mm x 45° typical Material: BK7, grade A Reflectance: Rav =5% at 45° Wedge (optional): 1° vignetted portion of the beam to provide the sample. The danger, of course, is that the chosen region may not be typical of the entire beam. Beam Samplers Diameter, D (Inches) (mm) PART NUMBER ORDERING & TECHNICAL SUPPORT For a 1° wedged substrate append -W to part number and add $25 to the price. Note: Wedged substrates are several mm thicker. 189