PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please sub

[n2stuff]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

HeNe LPM 100.00
Metrologic RED Laser Meter to 20mw from 632nm to 830nm using 2/9V or A/C 120V | eBay

 

[n2stuff]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Working hene head and power supply Starting @ 30.00
Uniphase 1201-1 Helium Neon Laser and 1103P Tube | eBay

 

[Bionic-Badger]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Anamorphic Prism Pair coated for 632.8nm. Only $29, free shipping.

These are those expensive beam correction prisms like what Dr. Lava was selling. These are coated for red, not IR. $29 is a STEAL.

 

[Bionic-Badger]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

And now just one is left . . . if you blink you very well may miss it :cryyy:

That ebay seller also has a lot of diodes for some "exotic" IR wavelengths like 830nm, 798nm or such if you're into wavelength collecting.

 

[Bionic-Badger]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I just received my prism pairs. They are very nice! Beautiful blue-purple coating. Only one left in the auction!

 

[tsteele93]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

And now just one is left . . . if you blink you very well may miss it :cryyy:

I'd get it but I just don't do any lab type lasers, everything I do it handheld and I don't see that working in any host I can imagine.

 

[Bionic-Badger]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Oh I've seen some "handhelds" that would fit those among other large optics. You do have to think beyond Aixiz lenses though...

 

[ARG]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Oh I've seen some "handhelds" that would fit those among other large optics. You do have to think beyond Aixiz lenses though...

I actually have something in the works with cylindrical lenses and a 500mW mits diode in a regular sized handheld. I have yet to do a mits build because the ugly beam scares me off.

 

[Alexizupinhea]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

That is a great price on a Variac. Thanks, may have to bite. The only thing I'm slightly worried about is that I feel like it looks a little small for a 5A one. I wonder if it truly can handle that high of current. Either way though, great deal.

 

[Cyparagon]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I never understood why they put just a volt meter on the front. The knob position offers and equally good approximation of voltage, why not put an ammeter in that space instead?

 

[bobhaha]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Damn.... if only that was 240V input I would grab that in a second!

 

[bennett326]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I just received my prism pairs. They are very nice! Beautiful blue-purple coating. Only one left in the auction!

hey will that set work better than the meredith optics?

 

[Cyparagon]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Heheh, Looks like someone got zapped one too many times with his experiments and gave up

 

[hakzaw1]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

love this thread- keep up the great finds- when system allows Madmac gets another +2 from me.
check these two out and be my guest --


Melles Griot HeNe Laser & Power Supply | eBay
Hmmm- is that a fiber optic coupler out front?
632.5 most likely- Cant make out much on the label.
good item for Dr Sam to chime in on..

they want $23.22 if it was being shipped to Texas- I am not bidding(or sniping) this one--GL and plz let us know what you got??

and these from the good folks at Sunnking-- My dealings with them has always gone well.
but .. no mirrors? and you need powersupplies and driver boards and mounting block..tuning them takes a PJ.. just to find out if they will still work- I pass.

(2) GSI Lumonics Cambridge Technology Galvo Laser Scanner 000-Z2263 | eBay

 

[n2stuff]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Yup Madmac has been finding some good stuff. Here is one I would love to have but no mad money right now.

NEW SPECTRA-PHYSICS ARGON ION LASER HEAD model 163D 514nm 457nm | eBay

 

[Bionic-Badger]

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

hey will that set work better than the meredith optics?

Here's the thing with prism pairs versus cylindrical lenses:

- Cylindrical lenses are for focusing (collimating) a beam in only one axis.

- Prism pairs are for reducing the width of an axis of an already collimated beam (i.e. correcting aspect ratio).

The problem with those 638nm laser diodes is that each axis has a different divergence angle (7.5 vs 35 degree angles). So with a circular lens, one axis gets collimated, but the other still diverges. That's why you need to have separate collimation for each axis. Chances are, if you can collimate your beam, you won't have the exact optics to create a square beam--especially given the price of cylindrical optics. So now you can take the prism pair and correct one of the axises, or at least try and reduce the aspect ratio.

So here is what I'm going to do:

1) Use cylindrical lenses to collimate both axises; 2) use the prism pairs to reduce the beam diameter in one axis if there is a mismatch (this probably won't be perfect).