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Optomechanics

Spatial Filter System

Mounting Basics For many applications, such as holography, spatial intensityvariations in the laser beam are unacceptable. Our KT310 spatial filter is ideal for producing a “clean” Gaussian beam. Referring to the photograph on the left, the input side(left) consists of a Z translator that will hold a diffraction limited aspheric lens to focus your laser through a pin hole. The pinhole should be mounted in the XY translator provided to allow easy adjustment. See below for page numbers.On the output side(right), provisions have been made for themounting and centering of a Ø1" collimating optic. Choose fromour selection of plano-convex Ø1" lenses featured on pages 564-570. Recommended Parts for KT310 1.Lens ITEM #C220TME-B, see page 6152.Lens ITEM#LA1131-B, see page 565 3.Pin Hole ITEM#P25S, see page 186 Note: Beam Expansion equals the focal length of the output side divided by the focal length of the input side.
Optical Rails Mirror Mounts KT310 Lens Mounts Input SideXYTranslator HousesPinholeOutput Side 4.21" (107mm) Beam HeightP-Series PostSee page 90 Filter MountsRotation Post Mounted Adapters V-MountsApertures & Iris Diaphragms Lens Tubes Cage Systems Principles of Spatial Filters Mechanics only
The input Gaussian beam has added to it spatially varying intensity“noise.” When a beam is focused by an aspheric lens, the input beam istransformed into a central Gaussian spot (on the optical axis) and sidefringes which represent the unwanted “noise.” The position of the sidefringes is proportional to the spatial frequency of the “noise”. By centering a pin hole on the central Gaussian spot, the “clean” portion ofthe beam can pass while the “noise” fringes are blocked.The diffraction limited spot size at the 99% contour is given by: D = Purchase Optics &Pinhole Separately Focusing optics: Pages 599Collimating optics: Pages 599 Pinholes: Page 186 ITEM#METRIC ITEM#$DESCRIPTION KT310KT310/M$625.00Spatial Filter Mechanical Assembly ITEM#METRIC ITEM# £ ¥ λ ƒ/r, where KT310KT310/M£468.75 656,25¥106,250 λ =wavelength, ƒ=focal length and r=input beam 1/e 2 radius. A pinhole that is approximately 30% larger is chosen to allow thefocused Gaussian spot to pass while blocking the “noise” fringes that areshifted off axis.

Tools of the trade - Vol 18 - 36188 TOOLSOF THETRADE

BE10XBE05XBE02X BE15X

Beam Expanders

λ /4) and provide diffraction limitedperformance (for <Ø1mm input).
15X Beam ExpanderMounted in KS2 â–  Ideal for reducing beam divergence
â–  Compatible with many of our standard optics for focusing
â–  Diffraction limited performance with
â–  Input aperture is threaded to integrate with our SM05 or SM1 threadedadapters
â–  Non-rotating lens translation for amore stable output These Galilean Beam Expanders provide an idealsolution for expanding or reducing beam diameters. Beam expanders are commonly used to reduce divergence. Another common use is to expand the beam and then focus with another lens to takeadvantage of a reduction in spot size. These beamexpanders have all been designed to minimize the telescope length, minimize the introduced wavefront error (

For Further information and Pricing See page 543 in the Optics Section of this catalog.

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