Search found 280 matches
- Tue Nov 12, 2019 5:45 pm
- Forum: Beginning Holography
- Topic: Two issues - losing an object beam and spots on plate
- Replies: 17
- Views: 11210
Re: Two issues - losing an object beam and spots on plate
Antonio, I assume your object is diffuse, i.e., it breaks polarization. I also assume that lengths of the object and the reference paths are approximately the same, i.e., within the coherence length of the laser you use. You can check the amount of object light hitting the plate as Dinesh suggested,...
- Tue Nov 12, 2019 5:25 pm
- Forum: holoforum administration
- Topic: Denial of Service Attack (more or less)
- Replies: 4
- Views: 7694
Re: Denial of Service Attack (more or less)
Thanks for solving the problem and keeping the forum alive!
- Sat Nov 09, 2019 1:00 pm
- Forum: Beginning Holography
- Topic: Two issues - losing an object beam and spots on plate
- Replies: 17
- Views: 11210
Re: Two issues - losing an object beam and spots on plate
It is difficult to judge, but as Ed pointed out: the most likely reason is movement. It can be either movement of an optical component, which can be tracked by careful inspection of the setup. The other thing that can move is air - split beam setups are very sensitive to air currents.
- Sat Nov 09, 2019 9:56 am
- Forum: Beginning Holography
- Topic: Current practical methods for printing CGH
- Replies: 6
- Views: 6727
Re: Current practical methods for printing CGH
I have no particular recommendation to the imagesetting device. About 20 years ago, you could find one in every medium size town. Today, they were largely replaced by CtP (computer-to-plate) technology. But imagesetters are still used in printing industry, for exampe in silkscreen printing or in die...
- Fri Nov 08, 2019 3:28 pm
- Forum: Beginning Holography
- Topic: Current practical methods for printing CGH
- Replies: 6
- Views: 6727
Re: Current practical methods for printing CGH
Hi, Nana, as far as I know, there is no simple and affordable way. You can find someone from the printing industry still operating an imagesetter. It will "print" you a binary opaque (black) pattern on a transparent film. The imagesetters pixels can be approximately 10 um in diameter, mayb...
- Thu Oct 24, 2019 4:48 pm
- Forum: Off Topic
- Topic: Anybody still here?
- Replies: 19
- Views: 13928
Re: Anybody still here?
I can confirm that soda is working hard to make his pulsed ruby perfect!
By the way, as far as I know, unixboy succeeded in making his pulsed ND-YAG; unfortunately, I think he cannot follow the forum from China due to government restrictions.
By the way, as far as I know, unixboy succeeded in making his pulsed ND-YAG; unfortunately, I think he cannot follow the forum from China due to government restrictions.
- Fri Oct 18, 2019 4:19 am
- Forum: Off Topic
- Topic: Anybody still here?
- Replies: 19
- Views: 13928
Re: Anybody still here?
I prefer this forum to discuss more involved topics.
- Sat Jul 06, 2019 9:08 am
- Forum: holoforum administration
- Topic: PM problem
- Replies: 6
- Views: 15908
Re: PM problem
Who knows... Anyway, it seems everything is OK now. Thanks for keeping the forum!
- Fri Jul 05, 2019 3:34 am
- Forum: holoforum administration
- Topic: PM problem
- Replies: 6
- Views: 15908
PM problem
Hi,
it seems something is wrong with PMs - there are two messages hanging in my outbox, one for Ed, the other for Dinesh. It seems they have not been sent, although at least Ed logged in since I wrote them.
Petr
it seems something is wrong with PMs - there are two messages hanging in my outbox, one for Ed, the other for Dinesh. It seems they have not been sent, although at least Ed logged in since I wrote them.
Petr
- Tue Jul 02, 2019 3:21 pm
- Forum: General Holography
- Topic: magnified hologram
- Replies: 14
- Views: 11077
Re: magnified hologram
So it will be magnified (not shrunk) if the reference beam diverges from a location on same side as object but farther away. If that location is twice as far from the plate as the object for instance, we will get 2x transverse magnification and 4x longitudinal. Maybe :) I always have to draw a few ...