Natural Science Forum / Physics / Optics / August 2008

I'm about to purchase a reasonably high powered diode laser (up to 40
watts, but I dont need to decimate anything above 15-20 watts) and I
need to attenuate the beam.  I'm looking to decimate at least 4 dB, 10
is probably the upper boundary.  Does anyone have any suggestions for

I got a couple new Casix crystals from a friend. They are about 3mm sq
x 5mm long. AR Coated both ends. There are some numbers on them but
are pretty cryptic. They both share the same number of 85722 so I
think they are the same. One of them though has a sticker on t from

I don't understand the physics behind this second peak.  Its peak can
be upto a quarter of the modelocked pulse (in the frequency domain).
Is it possible to model this behaviour?  Incidenlt its a Ti: Saph
laser...

Got a design coming up where there will be lots of fiber-optic parts
within the electronics. Has to be that way because it's fast stuff and
the only way for others to understand is if I draw the FO lines and the
respective parts into the schematic. No problem to generate nice ...

Hi everyone, I am selling these lasers on Ebay FYI
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260279304957

I know, The Who and VH1, not exactly the best pairing up.
Good show though, Foo Fighters and others doing Who covers,
and then three or so song's from The Who themselves. Lasers
looked great! Not overdone, in fact, done in the style of the Who's

Greetings to all of you!
I need some schematics for laser diode that is 808nm, 1.1W (2V, 1500mA
operating current.) I've searched at Sam's laser for all day but..it's just
too much informations  there :D I found one, other....tryed to use google

Hello, i'm finding quite hard to find a CO2 laser with 1-2W output
power...
Anyone know where i can find one?
I'm gonna use it in research for evoked potential, so i would need

I may have the possibility to buy this Nd:YAG cheap, it is without
chiller and powersupply but has a new lamp.
It says "180W CW/35mJ on the label" and is said to be from Spectron
Laser Systems (now owned by GSI Lumonics).

by dismantling it and putting in a nonlinear crystal to act a a kerr
lens?
Just a Friday night thought...  something I was thinking of looking
into...  I would like to try and build a solid state laser and thought

i have a few question to ask about laser diode use for burning purpose
1)  what is the relation between the wavelength (nm) , laser beam output
(mW) and burning power (Js)
   :ex( does 808nm@200mW = 650nm@250mW)

Suppose that instead analysing Fresnel reflection from a dielectric
interface using an infinite plane wave approach, instead you consider a
point source radiating a spherical wave toward the interface from some
distance away.

I have here a coherent i-90 tube that I'm trying to start, its been
idle for approx 12 months. It has an alc909 psu ,
when I power it up I get the following sequence....
power up and can hear relay click,

I have tried e-mailing Brian Bohan at Cambridge Laser Laboratories to
get a manual for my Lexel 350 dye laser, but seem to be getting
ignored. He is the only source for the manual I have found. Is there
anyone who's buds with him that could help me get a copy? Thanks.