Search found 77 matches

by thycore
Sat Oct 13, 2018 10:27 am
Forum: General Holography
Topic: Laser pico projector for making color holograms
Replies: 48
Views: 21506

Re: Laser pico projector for making color holograms

holomaker wrote:
Mon Oct 08, 2018 6:17 pm
Ok success 650nm @20mw !
Shot using Liti film w 2-4 min exposure
2 to 4 minutes seems quite a long exposure isn’t it ? Didn’t you mean 2-4 seconds instead ?
by thycore
Mon Oct 08, 2018 3:42 pm
Forum: Beginning Holography
Topic: I guess this one is overexposed xD
Replies: 0
Views: 6905

I guess this one is overexposed xD

I reduced my microscope objective from X40 to X10, as a result the brightness of the laser was unsuspectedly higher !

I guess this plate has been overexposed xD !!
01D5E1F0-6A10-4637-9581-C841B124873A.jpeg
01D5E1F0-6A10-4637-9581-C841B124873A.jpeg (1.94 MiB) Viewed 6905 times
It is literally white-opaque in the center area !
by thycore
Mon Oct 08, 2018 1:49 am
Forum: For Sale / Trade
Topic: Looking for spatial filters
Replies: 6
Views: 3295

Re: Looking for spatial filters

This lens type would for sure expand the beam, but would it also clean the N1+ order harmonics of the laser ? I sorta read it’s best to have a clean airy disk to work with my set up to have better resolution & more uniform exposure ?
by thycore
Sat Oct 06, 2018 7:52 am
Forum: AgX
Topic: Fixing or desensitizing ultra-fine grains emulsion ?
Replies: 1
Views: 4624

Fixing or desensitizing ultra-fine grains emulsion ?

I’m reading this astonishing book from H.I Bjelkhagen about silver-halides processing and I came to chapter 4 where it is discussed possibility to somehow fix or de-sensitize a developped hologram. Fixing with thiosulfate, Or Desensitizing with Phenosafranine In my quest of producing reflection holo...
by thycore
Fri Oct 05, 2018 4:20 pm
Forum: For Sale / Trade
Topic: Looking for spatial filters
Replies: 6
Views: 3295

Looking for spatial filters

Hey folks,

I believe I now need to add spatial filters to my set up, any of you would still have some for sale?

Thanks !
by thycore
Wed Oct 03, 2018 4:44 pm
Forum: AgX
Topic: Ultimate U08 / Bleach : reversal or rehalogenating ?
Replies: 8
Views: 6473

Re: Ultimate U08 / Bleach : reversal or rehalogenating ?

My mind just blown up. :shock:

Thank you so much for these explanations :-) I’ll need some dozen readings to fully compute all this info !
by thycore
Mon Oct 01, 2018 9:36 am
Forum: AgX
Topic: Ultimate U08 / Bleach : reversal or rehalogenating ?
Replies: 8
Views: 6473

Re: Ultimate U08 / Bleach : reversal or rehalogenating ?

Thank you Martin for your time & explanations, I purchased that book right now, I'll sure give it a read ! I'm in the step of the learning process what I need to understand better what happens in my materials to fine-tune my set-up and results :) So... how is this possible to have a Rehalogenating b...
by thycore
Fri Sep 28, 2018 5:56 am
Forum: AgX
Topic: Ultimate U08 / Bleach : reversal or rehalogenating ?
Replies: 8
Views: 6473

Ultimate U08 / Bleach : reversal or rehalogenating ?

Hey folks, In my quest of understanding emulsion shrinkage (ie. when it does happen in my process). I came to an interesting reading here : https://ocw.mit.edu/courses/media-arts-and-sciences/mas-450-holographic-imaging-spring-2003/readings/holochemistry.pdf bleach.jpg Question, anyone know what kin...
by thycore
Mon Sep 24, 2018 2:31 am
Forum: Beginning Holography
Topic: Troubleshooting : emulsion peeling off
Replies: 9
Views: 5988

Re: Troubleshooting : emulsion peeling off

This poor drawing of mine represents my current understanding of the chemistry and over-time phenomena : bleach_not_bleached.png There are 2 assumptions that I might have misconception about : - Isn't light supposed to bounce off the deeper layers of the emulsion to reconstructs the virtual image ? ...
by thycore
Sun Sep 23, 2018 2:42 pm
Forum: Beginning Holography
Topic: Troubleshooting : emulsion peeling off
Replies: 9
Views: 5988

Re: Troubleshooting : emulsion peeling off

Hey by the way Valéry I think I just ordered your telescope hologram on eBay :-) ( Loïc )