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Comments:
<0> Aren't AOL CDs already diffraction gratings? They reflect those rainbowy colors and all...
<1> You can't beat specifically-made equipment, though
<1> I've just got some lenses and prisms so i can take some pictures of fresnel diffraction patterns :-)
<1> Well, a shield w/aperture
<1> Prisms for other stuff
<2> James-S: how do you do that?
<1> With some difficulty :-P
<3> JohnFlux you probably want some kind of a screen that's designed to be burned
<2> James-S: how do you view a diffraction pattern?
<2> microacg: sure
<3> a temperature sensitive screen
<3> I don't know exactly how to get those
<2> but for example electrical tape can be burnt through really easily
<2> the shiny stuff
<3> the key is probably running it for the right duration
<2> well my pulse is 100ns long
<2> i can't really get it much longer without some serious capacitors
<3> can't you repeat it?
<2> yeah but too hard to make sure nothing moves
<3> I'd have to see your equipment to see what you mean I guess
<1> Hmm
<2> if the pulse are say 40th of a second apart, you have to make sure nothing moves more than a few hundred nm in that time
<1> Hmm.. i'm not teaching tommorow :-D
<3> I am :/
<2> the slightest vibration will move the equipment enough so the diffraction lines don't overlap
<3> Johnflux how precise must the final pattern be?
<2> James-S: you could explain how you view diffraction patterns :-)
<2> well anything will do
<3> if anything will do the movement probably won't be a problem if everything is just held down
<1> Well, i'm using a computer simulation thing first, JohnFlux
<2> my optical tables aren't floating
<2> James-S: what do you use?
<3> how big is the fringe spacing on your screen
<2> microacg: me? well my laser is 432nm (green)
<2> so roughly that
<3> uh
<3> I don't think that is roughly the fringe spacing with a decent configuration
<3> I'd hvae to run the calculation to see
<1> Eh, one minute boys
<3> how big is the slit, and how far from slit to screen
<1> I'm busy trying to type this up
<1> But yes, i'm using an intensity sensor, JohnFlux
<1> :-P
<2> microacg: I just split the beam, then have the two beams intersect again
<2> microacg: so it interferes with itself
<3> it isn't a double or single slit?
<1> Whose, microacg ?
<2> microacg: nah
<3> James-S: @johnflux
<1> Oh, nevermind
<1> :-P
<3> JohnFlux, oh I see
<3> not what I thought
<1> I'm using lenses with both single/double, then using normal single/double and aperture/lenses
<2> James-S: what do you work on?
<1> What do you mean?
<2> James-S: ah okay
<2> James-S: what's your research field
<3> James-S, do you recall off hand how to determine plank's constant from an interference pattern?
<1> Thermodynamics
<1> microacg: Not off hand
<1> :-/
<3> awe, I can't remember
<1> Hang on
<1> Best book an optician can buy
<3> I have an eyegl***es appointment, can I save money by buying that book?
<1> :-P
<2> http://en.wikipedia.org/wiki/Mantis_shrimp#The_eyes
<1> I dont know the correct term for an optics-based-physicist other than optician :-(
<2> woah imagine having eyes like this guy
<1> or Specky four lenses
<1> :-D
<2> James-S: yeah everyone here swears by Hecht
<1> I love it, i spent around a year studying with it.. never let me down
<1> Mine cost me a princely sum of when i first got it
<2> hmm
<2> I looked for that book in my uni library
<2> but they didn't have it
<1> Now they go for..
<2> i didn't want to buy it :(
<2> what symbol is that?
<1> Pounds
<2> set your encoding to utf8 :P
<1> It is :-(
<2>
<1> EUK_JP, though
<4> Bill Belichick is a major ***hole
<1> Yep, i can see that JohnFlux
<1> :-)
<3> http://www.amazon.com/Optics-4th-Eugene-Hecht/dp/0805385665/sr=1-1/qid=1169677433/ref=pd_bbs_sr_1/104-3204150-4084737?ie=UTF8&s=books
<1> http://product.ebay.com/Optics_ISBN_0805385665_W0QQfvcsZ1388QQsoprZ1963798
<2> EUK_JP - what's that?
<3> "This textbook covers wave motion, electromagnetic theory, propagation of light, geometrical optics, superimposition of waves, polarization, interference, diffraction, fourier optics, lasers and more."
<1> ISO-2202-JP
<3> Do you think they meant 'superposition'?
<1> microacg: It's the best optics book by far
<1> I'd sell a copy of it for ;-)
<2> ?
<1> That comes up as..
<2> 20 uk pounds?
<1> You know, that comes up as the Chinese Traditional symbol for "Gift" :-/
<5> good night
<2> :-)
<1> ~.
<2> crazy_penguin: gnight ;-)
<1> Can you see that? :-P
<2> James-S: yes, but do I see what you see ;-)
<1> What does it say then
<2> i see A E A 3/4 a - ' >> 3 E I A (R)
<1> ;-)
<1> I dont
<3> ~.
<2> microacg: that's not useful now is it :P
<1> To me, it says "Ashigara Kamigoori Yamakita Cho"
<1> Reason i have ISO-2202 is because i'm talking in Japanese sometimes in the JA channels here
<1> :-)
<2> James-S: so use iso-2202 in there, and utf8 here
<2> that's what I do
<3> Schaum's Outline of Optics by Eugene Hecht
<2> konversation supports it
<3> interesting
<1> Right, i've done it
<2> James-S: I'll buy that optics book from you for 20 pounds
<1> :-P
<1> I've got an older version in storage
<1> I'd loan it to someone so long as they sent it back
<2> I'd forget :-)
<2> to be totally honest :-)
<2> James-S: I'll send you a amazon voucher
<2> :-)
<1> Where abouts do you live? In the US?
<2> i live near you
<2> brighton
<3> have a physics party
<6> lol
<2> microacg: :-D
<3> if anyone is near Washington DC lemme know
<1> Haha, an optics party
<1> :-P
<3> we'll party to debroglie wavelength
<1> lambda = PAR-TAY
<1> :-D
<2> James-S: deal? :-)
<1> I'll see if it's in storage first, JohnFlux
<2> neat :)
<1> :-)
<1> Wed Jan 24 22:34:44 2007
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