Search found 77 matches

by thycore
Tue Jan 07, 2020 3:33 pm
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 1422

Re: Blackening the emulsion for reflexion holograms

What exactly does UV on this film ? Do you use it on freshly developed / bleached film ? Is it acting like a « fixer » ?
by thycore
Sun Jan 05, 2020 6:23 pm
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 1422

Re: Blackening the emulsion for reflexion holograms

I’m using holographic film from an antique Holofilm250PAR lot. These films does not like to keep the paint on it, probably due to flexibility, the paint tends to scale out ( damaging the hologram by the same way). I simply like to idea that a chemical process exists to make it just perfect easily :-)
by thycore
Sat Jan 04, 2020 3:57 am
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 1422

Re: Blackening the emulsion for reflexion holograms

We should add a section « Blackening » in the wiki part of the website to write this down :-) I’ve been struggling with laminoir or black paint for like 2 years with pathetically discussable results xD
by thycore
Thu Jan 02, 2020 2:05 pm
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 1422

Re: Blackening the emulsion for reflexion holograms

Okay, not sure if fizzing is a good or bad thing but I take this is not a desirable effect xD
by thycore
Mon Dec 30, 2019 10:04 am
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 1422

Blackening the emulsion for reflexion holograms

Hi there, An old (and closed) topic on the forum : https://holowiki.org/forum/viewtopic.php?f=30&t=7304&hilit=blackening&sid=bbf6140c2e3c3c9854731cd327865cb6#p57579 Refers as a technique from Jeff Blyth to use Sodium Borohydride (Tétrahydruroborate de sodium in french) to blackens the rear part of t...
by thycore
Sun Dec 22, 2019 11:47 am
Forum: Beginning Holography
Topic: Spectral filtering
Replies: 2
Views: 214

Spectral filtering

Anyone experienced this kind of spectral filter to clean cheap Laser’s output ?

https://www.thorlabs.com/thorproduct.cf ... L05632.8-1
by thycore
Sun Dec 22, 2019 10:01 am
Forum: Beginning Holography
Topic: Current practical methods for printing CGH
Replies: 6
Views: 651

Re: Current practical methods for printing CGH

Perhaps some reverse engineering can be done on chimera process ?

https://www.ultimate-holography.com/chimera
by thycore
Sun Dec 22, 2019 9:12 am
Forum: Beginning Holography
Topic: Refilling helium-neon (hene) laser
Replies: 1
Views: 135

Re: Refilling helium-neon (hene) laser

Nice info here :

http://www.k3pgp.org/Notebook/Lasersam/ ... htm#htrtrr

Soaking in helium should be avoided while running the laser head to avoid any arc, I’ll document in video my attempt for my laser and we’ll see :-)
by thycore
Sun Dec 22, 2019 7:28 am
Forum: Beginning Holography
Topic: What do I use to expand an red Hene for a denisyuk hologram?
Replies: 3
Views: 195

Re: What do I use to expand an red Hene for a denisyuk hologram?

Take a microscope objective Like this : https://m.fr.aliexpress.com/item/32651361216.html?pid=808_0002_0101&spm=a2g0n.search-amp.list.32651361216&aff_trace_key=&aff_platform=msite&m_page_id=7034amp-v-8uqot4TYU4s5wbk-o7Wg1577017684058&browser_id=7e94972e347a489db6a8c8075f6efa08&is_c=Y A x20 could be ...
by thycore
Sun Dec 22, 2019 7:11 am
Forum: Beginning Holography
Topic: Refilling helium-neon (hene) laser
Replies: 1
Views: 135

Refilling helium-neon (hene) laser

Hi, I figured it would be nice to have a fresh new topic on refilling hene lasers. I might have an issue with my current hene tube and it was proposed that I store the tube in a helium-atmosphere. Basically put my laser in a bag full of helium for a couple days. I read somewhere the pressure inside ...