On: Sun, Jan 13, 02 06:04:14 PM
Jean Dufrasne wrote:
Does someone already try to build an holographic lens ?
I read in a book that this kind of hologram can replace
a lot of optical layout like beam splitter,
concave mirror (make parallel beam),...
Is it what we call HOE (Holographic Optical Element) ?
What are the advantages and disadvantages of that kind
of 'optical item' ?
Can I make a multi-lenses hologram (focal length, convex,
concave) with only one lens when record the hologram and
play with the restitution beam (angle, distance,...) ?
Or maybe someone has good links about this technique.
I know this question is maybe not clear enough.
I can send the scanned page of the book if someone need
more explaintations. In french, unfortunaly :-O
Thanks in advance.
Colin Kaminski - Wed, Jan 23, 02 11:14:26 PM I have been studying HOE's for about 9 months. I would
recommend making a HOE of a lens or a mirror before trying
to make a HOE of a lens system.
The main disadvantages to HOEs are the lack of efficiency.
If you make a lens much of the replay beam goes through un-
obstructed. This can be used as additional object
illumination of you plan things well.
Look into SHSG for processing as it yields the lowes noise
Thilo K. - Mon, Feb 11, 02 04:53:28 PM Hello Colin. Having read some messages written by you, a
question rose slowly inside my brain:
Where the hell did he get that knowledge ? ;) Are you a
professional holographer or is your job connected
with lasers in another field ? 188.8.131.52
pio Diaz Valdez - Wed, Nov 27, 02 08:28:44 PM im living in denmark where i have a gallery for
contemporary art, im trying to bild an interactive hoe
if you have information we can shere panorama2000@
Helpful Person - Mon, Dec 23, 02 09:29:47 AM You cannot replace a complete lens system with a single
holographic element. Your reconstruction reconstructs any
lens system for a single point in the object field.
Whatever you do, you have just a single surface to bend the
However, there are many advantages for using holograms to
replace simple collimating devices. For monochromatic
imaging they should be cheaper and better performing than
mirrors. (Reflection holograms are easier to make with
high efficiency.) As far as I know, these advantages have
not yet been used. The reason is that there are very few
companies that can make quality elements and hence the
method has got a bad name in the industry. 184.108.40.206
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