Backup Galilean Beam Expander

Aluminum cylinder a palm width long with a recessed aperture.

Details

9BB200 - Passive Optical Components

Demo use only

Instances

Instance #330
G2B20A - Demo West (Duane Physics)
Good - Normal Wear Demo use only

Used in these demonstrations

Three small opaque dots on a white disk held in a blue-handled finger clamp on a metal post
Safety

Diffraction around Opaque Disk

Demonstrates Poisson's (Arago's) bright spot: light diffracting around an opaque disk produces a counterintuitive bright spot at the center of the geometric shadow. Provides compelling evidence for the wave nature …
Optical rail with wooden mounts, He-Ne laser with spatial filter at left, optical components along the rail, and metal reflection shield at right end
Safety

Diffraction by a Circular Aperture

Students observe the Airy disk diffraction pattern — a bright central disk surrounded by concentric rings — produced when a laser beam passes through a circular aperture. The inverse relationship …
Green laser diffraction pattern from a wire showing a thin dark central shadow line flanked by bright diffracted light with visible vertical fringes on both sides
Safety

Diffraction from a Wire

A laser beam diffracts around a thin wire, producing a fringe pattern equivalent to single-slit diffraction of the same width (Babinet's principle). Students see that light bends around opaque obstacles …
Green laser diffraction pattern showing a bright central maximum with secondary maxima arranged in a cross pattern along horizontal and vertical axes
Safety

Variable Rectangular Aperture

Two independently adjustable slits (horizontal and vertical) form a variable rectangular aperture. Students observe in real time how narrowing one dimension widens the diffraction pattern in the perpendicular direction, demonstrating …

Reserve This Equipment

Demo use only

This equipment supports lecture demonstrations and cannot be reserved directly — it is assigned automatically as part of a demonstration. To use it, request a demo that includes it.