Search found 38 matches

by soda
Wed Jul 14, 2021 9:58 am
Forum: For Sale / Want to Buy / Trade
Topic: Osram PL530 530nm laser diodes tested @75mw SLM
Replies: 72
Views: 144650

Re: Osram PL530 530nm laser diodes tested @75mw SLM

Hi all, Recently my friend have ordered few PCBs for PL530 drivers. If all went well, soon will be available latest version, improved by soft start, integrated TEC PID driver and feature connector for external monitoring and controlling of the parameters. Complete PL530 lasers will come later, after...
by soda
Sun Apr 18, 2021 4:41 am
Forum: For Sale / Want to Buy / Trade
Topic: Osram PL530 530nm laser diodes tested @75mw SLM
Replies: 72
Views: 144650

Re: Osram PL530 530nm laser diodes tested @75mw SLM

Hi Loic, Very interesting idea, by my knowledge, the red and blue diodes cannot be modulated without lost of coherence. The green OPSL module is different kind of animal and I suppose that it's quite possible to modulate it without lost of SLM, but coherence should be somewhat reduced, mainly due to...
by soda
Sat Jan 25, 2020 7:14 am
Forum: DCG
Topic: I'm having problems getting my DCG emulsions to work...
Replies: 8
Views: 14064

Re: I'm having problems getting my DCG emulsions to work...

I had making DCG a long time ago, and my opinion that your problem shoud be in processing. After fix bath to reduce/wash out the rest of dichromate you !must use warm water bath! Without it, DE is low, the holo is barely visible. The water bath should be 35-42C (perhaps much higer) for rougly 2 min....
by soda
Wed Jan 08, 2020 4:26 am
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 11926

Re: Blackening the emulsion for reflexion holograms

The UV cures the LOCA glue. Complete sequence is: Pre-swell the film to get blue shift and replay in green. I use alcohol with small amount of water. The amount of the water control the blue shift. Simply drop few drops on glass and lay the film on it, add another drops and add another glass. Wait f...
by soda
Tue Jan 07, 2020 12:05 pm
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 11926

Re: Blackening the emulsion for reflexion holograms

The best way how to handle the holofilm250 I found use few drops of LOCA uv glue (cheap on ebay for cell phone repair) to sandwich it to glass and press the sandwich firmly, then irradiate it by the UV lamp (or direct sun). Then the hologram can be used as master from the other side, or simply paint...
by soda
Tue Dec 17, 2019 6:50 am
Forum: For Sale / Want to Buy / Trade
Topic: Osram PL530 530nm laser diodes tested @75mw SLM
Replies: 72
Views: 144650

Re: Osram PL530 530nm laser diodes tested @75mw SLM

I newer exeed 500mA for the diode, even I have it tested to survive easily 800mA for short time with good cooling. In final builds I set the current close to maximum 480mA, due to at higer setings side transverse modes often occurs - Hermite (axial symetric around central main beam), which are at sl...
by soda
Mon Nov 18, 2019 5:16 pm
Forum: Optics
Topic: Ruby LASER for holography
Replies: 6
Views: 8583

Re: Ruby LASER for holography

The laser is build on big fused quartz tube as rigid frame, in this picture is with two-lamp pump chamber, later switched to more effective single lamp alluminium one. Cap bank is 380uF/2400V, but now operated at 1600V max.
by soda
Mon Nov 18, 2019 4:18 pm
Forum: Optics
Topic: Ruby LASER for holography
Replies: 6
Views: 8583

Re: Ruby LASER for holography

Few examples:
by soda
Mon Nov 18, 2019 4:11 pm
Forum: Optics
Topic: Ruby LASER for holography
Replies: 6
Views: 8583

Ruby LASER for holography

Making the ruby laser is quite easy thanks to time to time avability of the ruby rods on Ebay. Make the rod lasing require several hundreds Joules of flash energy and two mirrors. Make the laser suitable for holography is another story. Free running ruby laser have poor coherence and the pulse is fe...
by soda
Fri Nov 08, 2019 1:24 pm
Forum: General Holography
Topic: Easy to build Peltier cooling for Osram PL530
Replies: 4
Views: 6436

Re: Easy to build Peltier cooling for Osram PL530

Great! I have designed analog driver for PL530 include peltier driver, but currently I have no time to produce complete lasers... see for inspiration: https://www.holographyforum.org/forum/viewtopic.php?f=11&t=9912&start=30 The PPLN heater is very sensitive part of PL530, when driven to cons...