Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Experiments & Modifications



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 02-12-2011, 04:14 AM #1
PlasmaCube's Avatar
Member
 
Join Date: Jul 2009
Posts: 46
Rep Power: 0
PlasmaCube is on a distinguished road
PlasmaCube PlasmaCube is offline
Member
PlasmaCube's Avatar
 
Join Date: Jul 2009
Posts: 46
Rep Power: 0
PlasmaCube is on a distinguished road
Default Double-slit experiment and quantum eraser

Hi!
So, I had wanted to build a working example of the double-slit experiment. Yes, I suppose that diffraction and the wave nature of light is easy enough to demonstrate, but it's always better when you use lasers, am I right?
But even beyond a simple double slit experiment, I found this article on making a quantum eraser. So I gave it a shot.

Here's what I ended up with. It's a high-powered red LCC, being driven by a simple LM317 circuit. I made a simple (and terrible) mount from sheet acrylic using solvent welding. For the obstruction holders, I used two helping hands (cheap ones) which I attached to the acrylic base.









The leftmost piece is a thin wire that is attached in front of two linear polarized that are perpendicular to each other. This is the "labeler" in the quantum eraser setup. The middle is simply a wire, which is used to demonstrate the "double slit" portion of the experiment. The rightmost is two polarizers at right angles to each other, but without any wire.

Here is the interference pattern that appears with the wire by itself.



Notice the obvious fringes.
Here it is with the "labeler."



This did not work as dramatically as I had hoped for. It's somewhat difficult to align the wire and the edges of the two polarizers together at one point. This seems to be the best I can do with this particular set up. Notice that the central fringe is fairly solid-looking, even though it gives some hint of interference lines.
Here it is with the "eraser" inline after the "labeler."



Pardon the terrible photos. The eraser is at a 45-degree angle, to show the difference with and without the eraser. Notice that the light in the central fringe appears solid-ish above the diagonal seam, but that the light below shows some relatively obvious interference.

I suppose my question is, am I analyzing this too optimistically? Is there a better way to perform this experiment? Is my "labeler" incorrectly made? Should I stop posting giant pictures?

That's about it.

Here's a picture of the beam with no obstruction, for reference.



EDIT: Maybe I should have posted this under "Science & Lasers" instead?



Last edited by PlasmaCube; 02-15-2011 at 07:38 PM.
PlasmaCube is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 05:42 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC