Search found 258 matches

by lobaz
Sun Sep 27, 2020 1:43 pm
Forum: Gallery
Topic: First Light with Integraf Kit
Replies: 26
Views: 1255

Re: First Light with Integraf Kit

Building a table is a good idea. But before that, try building a Michelson interferometer in a sandbox or even on the floor. This could give you an idea how much isolation you really need. Green VRP-M plates by Slavich (distributed by Integraf in US) are OK. If you can afford them, try Ultimate from...
by lobaz
Thu Sep 24, 2020 1:47 pm
Forum: Gallery
Topic: First Light with Integraf Kit
Replies: 26
Views: 1255

Re: First Light with Integraf Kit

Thanks! Any suggestions for the next incremental step? That is the big question. It all depends on your intent with holography. If you are interested in making display holograms, try a setup where the plate does not touch the object. It will make you think about stability and ease of use. If you ar...
by lobaz
Sun Sep 13, 2020 2:29 am
Forum: Gallery
Topic: Little old Lady
Replies: 5
Views: 161

Re: Little old Lady

Is it sensitive to angle of ilumination? A common AgX volume hologram (Denisyuk type) illuminated by white light changes its color as the illumination angle changes. It is thus very sensitive to illumination angle for laser illumination - it either reconstructs well, or does not reconstruct at all. ...
by lobaz
Sat Sep 12, 2020 11:26 am
Forum: Gallery
Topic: Little old Lady
Replies: 5
Views: 161

Re: Little old Lady

Is is a two colour single beam Denisyuk?
If it is, then it is impressive. With AgX it is difficult to reconstruct volume holograms with laser light.
by lobaz
Sat Sep 12, 2020 11:23 am
Forum: Gallery
Topic: First Light with Integraf Kit
Replies: 26
Views: 1255

Re: First Light with Integraf Kit

Congratulations! It seems you got over the very beginner's phase.
Now comes the hard part: to decide what to do next.
by lobaz
Sat Aug 29, 2020 12:24 pm
Forum: Off Topic
Topic: PSA: SPIE Conference is this week, virtual, and free.
Replies: 1
Views: 426

Re: PSA: SPIE Conference is this week, virtual, and free.

Thanks for posting. Unfortunately, nothing related to holography. But indeed, a lot of interesting stuff from other areas of optics.
by lobaz
Sat Aug 22, 2020 11:06 am
Forum: Gallery
Topic: First Light with Integraf Kit
Replies: 26
Views: 1255

Re: First Light with Integraf Kit

Good! If possible, try to cover the upper edge of the glass. If light gets through that edge inside the glass, you get those ugly horizontal strips crossing the upper coins. Covering that edge is even more important in hologram recording, otherwise those strips are permanently stored in the hologram.
by lobaz
Sat Aug 08, 2020 8:53 am
Forum: Gallery
Topic: First Light with Integraf Kit
Replies: 26
Views: 1255

Re: First Light with Integraf Kit

Well done.
You can make a box (say 12x12x12 cm) with black inside surface. Make a 6x6 cm hole in the center of one side. This hole to a black interior will be much darker than your black paper you use for the hologram background.
by lobaz
Mon Jul 27, 2020 6:16 am
Forum: General Holography
Topic: Geola question
Replies: 12
Views: 585

Re: Geola question

The easiest would be to try recording a small Denisyuk hologram, with beam spread to a small area, say diameter 3 cm. That should make irradiance strong enough.
by lobaz
Sun Jul 26, 2020 8:22 am
Forum: Gallery
Topic: First Light with Integraf Kit
Replies: 26
Views: 1255

Re: First Light with Integraf Kit

Yes, "chrome bleach" is a potassium dichromate bleach. Overexposure generally leads to lower contrast of fringes - parts of the emulsion that were intended to be "unexposed" get some exposure due to excess time, while the parts that were intended to be "fully exposed" are still "fully exposed". Lowe...