WTB: High Power Spherical Lenses

[Jem]

Hi

I need a couple of small but very high power spherical concave (or convex) lenses. They don't need to be bigger than 10mm Maximum (5mm would probably be o.k.).

But, they need to be capable of expanding a raw 200mW 532nm laser to a diameter of 5" in a very short distance (8" maximum). A.R. Coated would be good, but non-coated is fine.

If you have anything kicking around please let me know by PM.

Thanks

Jem

[Carl B]

I take it you are getting your holography set up together again. If so I look forward to seeing the results. Photo's of your set up would be great to look at. Sorry but I can't help with a lens but good look with it.

Carl

[LesioQ]

I guess ball lenses surfacing on eBay from time to time would do the job.

http://cgi.ebay.com/MELLES-GRIOT-06-LMS-403-ball-lenses-for-diode-laser-X6_W0QQitemZ180374957738QQcmdZViewItemQQptZLH_Defa ultDomain_0?hash=item29ff2f6eaa&_trksid=p3286.c0.m 14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|293%3 A1|294%3A50


http://cgi.ebay.com/NEW-EDMUND-OPTICS-SAPPHIRE-BALL-LENS-1-0mm_W0QQitemZ250459758116QQcmdZViewItemQQptZLH_Def aultDomain_0?hash=item3a50909e24&_trksid=p3286.c0. m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|293% 3A1|294%3A50


Piotr.K

[Jem]

I take it you are getting your holography set up together again. If so I look forward to seeing the results. Photo's of your set up would be great to look at. Sorry but I can't help with a lens but good look with it.

Carl

Yes, the holography setup is back in action. I met up with a fellow holographer a few days ago and we made some nice transmission holograms on his sand table with my new C532-200. I'm setting up a very compact holography setup on my new optical table (1000 x 500), hence the need to be able to expand a beam very quickly. The divergence doesn't matter as it's just for object illumination. I have a nice 8" f3 FS collimating mirror for the reference beam , and thanks to another member on this forum I now have a couple of 'proper' Newport 900 spatial filters. If you thought laser projectors were a money pit stay well clear of holography! . Having said that, it is possible to make nice single beam reflection (Denisyuk) holograms on a reasonable budget.

Assuming I can get some decent results from this master transmission setup i'll then be able to do some H1 to H2 copies, then the fun really starts

@ Piotr... Thanks for the links . I had done a search on Ebay for ball lenses but not managed to turn anything up. The only problem with those is that they are extremely small and I fear handling them would be a problem. I was more looking for a traditional lens of around 5mm diameter as they are much easier to handle.

Cheers

Jem

[danielbriggs]

Jem,
I have had a look through my very sparse optics collection, and have a couple of things which may work.

- One is a very nice Melles Griot biconcave lens mounted in a 25mm diameter black annodised aluminium holder, 10mm thick. The lens itself is 6mm in diameter with a F.L. of -8mm. It has a MgF2 400-700nm anti reflective coating. Totally unused. (I also have another melles griot mounted lens, but may not be of use - PCX, 250mm FL, 21mm dia. same MgF2 coating)

- The other is an unmounted plano convex lens, 6mm in diameter, 5mm focal length. Again unused still in packaging. Could almost be aspheric. No coating.

I'll try and do some calculations to see if any of the FL's is suitable enough for what you need.
Ball lenses are usually used for fibre collimating.

If you want any of them, drop me a PM

Dan

[danielbriggs]

Jem,
Attached are the photos.

I also found the datasheet from the mounted pair. http://www.mellesgriot.com/pdf/X_06_34-35.pdf

[mixedgas]

www.Surplusshed.com

use the lens finder.

Steve

[trwalters001]

Would microscope objectives work?

[Jem]

Would microscope objectives work?

Well, yes and no

I have quite a few microscope objectives including some 60x ones. The main problem with using them is space, they also produce quite a dirty beam unless used with a spatial filter, and with this particular setup I don't have the luxury of much space. A spatial filter takes up about 4" of optical table space. I just ffelt that on this particular occasion a single lens would be more appropriate.

@Steve... Thanks for the link i'll take a look. Dan has one small mounted Melles Griot lens i'm buying off him which should prove perfect, I just need one more

Cheers

Jem