Basic Idea:

• Determine the wavelength of laser light using double-slit interference.

What:	How Many:	Where:
1.0 mW He-Ne lasers (Red or Green - ask Jeff)	1	Will be installed by faculty member You don't think I'm going to tell the world where we stash our lasers, do you?
Cornell Slides (Jeff has the new slides!)	1	non-Majors storeroom, shelf KK2
Wooden block to hold   Cornell Slide	1	non-Majors storeroom, shelf KK2
Metersticks	1 – One meter 2 – Two meter	non-Majors storeroom, shelf AA1 & AA2
Vernier calipers	1	non-Majors storeroom, shelf AA4
The following are needed if the green lasers are used! (See setup details below)
Burette clamp	1	non-Majors storeroom, shelf B2
0.5–m Optical bench	1	Majors storeroom, shelf P6
Optical bench riders	3	Majors storeroom, shelf P4
Lens holders	2	Majors storeroom, shelf P3
20 cm x 13 mm rod	1	non-Majors storeroom, shelf A3
The following components are shared by everyone:
Cornell-Slide projector	2	non-Majors storeroom, shelf BB6
30 meter tape measure	2	non-Majors storeroom, shelf AA5

Computers Needed?

• Yes.

• λ_red = 632.8 nm
• λ_green = 543 nm

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• Lab Setup (see this page for photo details):

  

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• Cornell Slide:

  

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• Place Cornell Slide in wooden block:

  

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• Green laser setup (it's nice to set up two green and two red lasers):

  

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• Green laser setup detail: Use a burette clamp to hold the Cornell Slide on the optical bench. May need to wrap jaws of burette clamp with thin foam to better grip Slide: