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I believe you are talking about Fresnel diffraction by a straight edge. Check out figure 3 in this pdf: (http://www.physics.udel.edu/~mfdecamp/lectures/Physics313_08S/Labs/313Lab07FresnelDiffraction.pdf) Any optic book should have the equations that describe it. They are not fun, by the way!

I noticed another lot of six on ebay again. I also searched for ps3 laser (http://video-games.shop.ebay.com/items/Video-Games__ps3-laser_W0QQ_catrefZ1QQ_flnZ1QQ_fromfsbZQQ_sacatZ1249QQ_sopZ15QQ_trksidZp3286Q2ec0Q2em282?_trksid=p3286.c0.m282 ) and it turned up several mispelled (KEM-400AAA) sleds...

I feel your pain! When I started graduate school, my boss knew I'd be working with lasers so he wanted us to get retinal photographs. They did the same thing, dilating each eye and then taking pictures with a bright flash while holding your eyelids open! It super saturated the cones so when I...

Check the Amazon reviews - some people don't think they are all that great. Buyer beware...

Re: GREEN LASER MODULE at price $10.50. last 7days I purchased two 40-50mW modules. They arrived fast and with a tracking number. At 3.5 V they are easily over 50mW, but they have around 5mW of 1064 (IR). I clamped one using a three-prong extension clamp and powered it with a lab power supply...

I have a 50mW module from Standstone11. I would guess the IR (1064nm) to be around 5 mW or so. Definitely be careful!

Re: daguin Holiday Clearance Sale Dave?  He's got so many toys, he could have a weekly sale!   ;D

Re: GGW-H20L 6x Sled GB!!! THE EPIC GB THREAD LAWL It is quite evident that the sellers/dealers from China frequent these forums.  Discussing how to deal with them here might not be the best idea... The first car I bought was a honda hatchback (used).  It was listed at $1k, and I offered $500...

Noticed this on Slickdeals, thought I'd post it here as well. Don't know if they have AAAs or other sizes on sale... (directly from slickdeals. Link for batteries: http://slickdeals.net/?pno=15725&lno=1&afsrc=1) All-Battery.com has 24 NIMH Rechargeable Batteries (2300mAh AA's) w/ Travel...

Bummer! Good to know, though - I was just thinking about buying of ebay something like that - good to know. Someone else on the forum said that the diodes were not the weak part in the PS3, and that on broken sleds they were good. Oh well.

richenglaser, I noticed several of your listings show TTL.  I would expect four leads:  two for the power, and two for the modulation. I only see two cables, though.  Are the chips powered off the TTL? Anybody know that speaka my language? K

Now that is a good deal.  I wonder how high they will go.  I posted these links because I remember someone (Maybe Caleb?) looking for them a while back. I agree, PS3 diodes are not for everyone.  I am particularly interested because these have a photodiode in the can which can be used to...

No kidding!

And, if you are looking to buy one, here $18 is a pretty good deal... http://cgi.ebay.com/405nm-Laser-Diode-HD-DVD-Blu-Ray-Blue-Violet-LD-New_W0QQitemZ130269382718QQcmdZViewItemQQptZLH

Anybody see this? Pretty cheap if it goes for $10! http://cgi.ebay.com/5mW-Violet-laser-diode-pointer-not-dpss_W0QQitemZ120336461013QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item120336461013&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A15%7C39%3A1%7C240%3A1318

It is amazing how many people say "I'm just curious" and then get hooked. Lasers (esp. cheap lasers) can be very addicting! Welcome. K

@sandman614 Have you seen this thread? Red + Violet http://www.laserpointerforums.com/forums/YaBB.pl?num=1226827066

Hey Tommy! Let me know when my ship, I'm really excited to get them. Kristopher

Does it still output IR?

Did you watch that video? It looked like the V2 50mW in the video couldn't even burn the black plastic at point blank range! With the plastic stretched and everything!