6C20.30 • Diffraction Around Objects: Pin Hole Diffraction

Photo Shows the Demonstration Apparatus Used by the University of Texas at Austin

Set Up Instructions / Notes:

• This demostration includes a geen laser, an optics rail and a slide wih a .2 mm circular pin hole aperture mounted to an X/Y stage.
• Important Note: The 200 micron aperture is rather small.   Hence, projected pattern is very dim.
• Note:   The auditorium must be completely dark.
• Even the A/V projection system will need to be blanked by pressing the "mute icon" on the control panel.
• The Airy disk and rings can be best seen by aiming the laser cart towards the prep room doors.
• The photo below was taken using a 2 second exposure with a DSLR. So, the Airy rings appear much brighter than to the naked eye.

Photo shows the use of an older demonstration apparatus with a .04 mm pinhole - circa 2014 of Texas at Austin

Another view of the apparatus used by UT Austin Physics Department

Last updated on June 26, 2024