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Old 02-09-2015, 05:02 PM #17
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Default Re: RGB Diffraction Grating

OK, I will have to study this for awhile, found some good info here, for those interested in the same:

http://www.fresnel.fr/files/gratings/Chapter1.pdf


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Old 02-09-2015, 05:59 PM #18
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Default Re: RGB Diffraction Grating

Quote:
Originally Posted by Alaskan View Post
LazeristasUVISIR
Do you know of any high efficiency gratings which can do more than 80%?
I think efficiency can be affected by the polarization of the light. S polarized is more efficient I think. There's a good chance I'm wrong, so I'd recommend doing your own research .
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Old 02-12-2015, 03:17 AM #19
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Default Re: RGB Diffraction Grating

That isn't a tube of light; it's just a poor choice of colors to represent the beam profile intensity.

Also you can use a prism to perform the beam combining based on the refraction. Just look at H2Oxide's pic. You can also use specially designed trichroic prisms found in 3CCD cameras.
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Old 02-12-2015, 04:32 AM #20
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Default Re: RGB Diffraction Grating

Better than one of these cubes? It must be or you wouldn't suggest it, what makes it better? Eager to know more. All I can find on ebay are the cubes: Trichroic Cube Prism RGB Combiner or Splitter 23mm x 23mm x 22mm | eBay

Googling, I found this:

Quote:
Abstract


A trichroic prism assembly design, believed to be new, is proposed and demonstrated. This new design has the advantages of low s- and p-polarization dependence in the reflectance spectra of the optical coatings. Hence it can be used for both color separation and color recombination with polarization change. This new trichroic prism assembly is especially useful in a compact color projector employing reflective liquid-crystal light valves.

2000 Optical Society of America
I'm finding lots of 3CCD cameras on ebay which can be had fairly cheaply, maybe time to get one that way if they will do what I need: http://www.ebay.com/sch/i.html?_odkw...amera&_sacat=0

Reading this thread: http://208.71.46.190/search/srpcache...-&fr=yfp-t-574 - My take is that a X-prism might be better?

I've been trying to think outside of the box on how to make a laser out of my 12 sets of R,G,B laser diodes and so far, I'm not getting out of the box very far. Keep coming back to the idea of trying to get all of the diodes as close as I can together without lenses, shoot all the raw light at one lens and collimate it together after they have expanded quite a bit together. Or, just to mount them all individually with their own individual lenses and let divergence turn it white at the end of the beam path.

Of course there is the knife edge path to what I want as the final output, but I don't like it very much due to the expense of all of the mirror mounts needed but I might be stuck with it.

I found a couple of diffraction gratings on ebay out of a fluorometer which used to output 200-700nm when paired with an arc lamp which might be interesting to use, but the loss is high compared to glass optics.



Ultimately, I want to control the color output of the laser, mix as needed to make lots of colors, a combined output for a white beam would be cool too.

.
.
.
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Old 02-12-2015, 06:05 AM #21
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Default Re: RGB Diffraction Grating

If you still want to go down the trichroic prism route, I found this: Broken 3CCD Camera. Unlikely anyone else will bid as it's listed as "for parts or not working". Unless of course someone else is looking for a Philips trichroic prism too . As far as I can tell by the very short description, the prism is intact. (If you don't go for it I might )
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Old 02-12-2015, 07:12 AM #22
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Default Re: RGB Diffraction Grating

Id buy it for a reasonable price but they won't ship to Alaska.
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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

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Old 02-12-2015, 10:07 AM #23
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Default Re: RGB Diffraction Grating

X-prisms work okay too. They usually need the light to be polarized, but your laser light usually is anyway.
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Old 02-12-2015, 12:09 PM #24
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Default Re: RGB Diffraction Grating

Quote:
Originally Posted by H2Oxide View Post
If you still want to go down the trichroic prism route
I bought a prism from Surplus Shed that fits this discription. Red, blue, green out 3 sides when white light enters 4th side. I can take pictures of it if anyone needs them. I hope I'm not confused and now confusing you guys.

Link to item LARGE MTD CUBE BEAMSPLITTER/COMBINER-1 IN-3 OUT OR 3 IN-1OUT - Surplus Shed
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Old 02-12-2015, 04:34 PM #25
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Default Re: RGB Diffraction Grating

Quote:
Originally Posted by starlight View Post
I bought a prism from Surplus Shed that fits this discription. Red, blue, green out 3 sides when white light enters 4th side. I can take pictures of it if anyone needs them. I hope I'm not confused and now confusing you guys.
You can find the cubes all over Ebay, is it a cube or does it look something like this: Philips trichroic prism? It's hard to tell from the photo on their site. Not sure what the advantages/disadvantages to this style over the cube are, perhaps someone with a little more knowledge can tell us.
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Old 02-12-2015, 05:43 PM #26
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Default Re: RGB Diffraction Grating

I've heard the cubes are lossy compared to using mirrors to combine colors, so I decided to go with mirrors until I saw how spendy the mounts would be for 36 of them. I found some 2 x 2.5 x 2.5 inch diameter cubes on ebay, although that's pretty big, does anyone know of any others which are even larger to be found for sale anywhere? I want to play with combining the raw output of several laser diodes into the cube. I also found two listings of 3CCD trichroic prism's on ebay with CCD's and prisms all together in an assembly for sale.

Edit: Here's one, they look very small, anyone know if this is standard, to be so small?

http://www.ebay.com/itm/361022439780
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 02-12-2015, 06:32 PM #27
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Default Re: RGB Diffraction Grating

Quote:
Originally Posted by Alaskan View Post
so I decided to go with mirrors until I saw how spendy the mounts would be for 36 of them.
You can build your own mounts, it would take some time, but it would be a lot cheaper than buying them.
Some old schematics I had gave detailed instructions on how to build them.
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Old 02-12-2015, 07:28 PM #28
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Default Re: RGB Diffraction Grating

Quote:
Originally Posted by H2Oxide View Post
You can find the cubes all over Ebay, is it a cube
Yeah it's a cube.





Quote:
Originally Posted by Alaskan View Post
I've heard the cubes are lossy compared to using mirrors to combine colors, so I decided to go with mirrors until I saw how spendy the mounts would be for 36 of them. I found some 2 x 2.5 x 2.5 inch diameter cubes on ebay, although that's pretty big, does anyone know of any others which are even larger to be found for sale anywhere? I want to play with combining the raw output of several laser diodes into the cube. I also found two listings of 3CCD trichroic prism's on ebay with CCD's and prisms all together in an assembly for sale.

Edit: Here's one, they look very small, anyone know if this is standard, to be so small?

http://www.ebay.com/itm/361022439780
What is on the other side?

I have this weird mirror on a chip from a DLP TV I can't figure out.



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405nm Ehgemus host 900mW (peak 635mW 3E lens) had 2 both died in first minute
450nm home made labby NUBM44 6w (peak 7.2w)
445nm Ehgemus RPL host 3W (peak 3.5W)
445nm home made labby 3W (peak 3.1W)
445nm 501b by Blord 2.5W (peak 2.7W)
447nm Dragon Lasers Spartan 1W (peak 1.3W)
520nm custom Ehgemus host NDG7475 1W (peak 1.5W)
520nm Ehgemus host PL520-B1 120mW (peak 143mW)
532nm labby 500mW (peak 630mW)
532nm Dragon Lasers Viper 75mW (peak 122mW)
532nm C6 host (peak 103mW)
532nm E-Bay 303 host 200mW (peak 95mW) 15% IR
589nm Dragon Lasers Spartan 50mW (peak 115mW)
650nm C6 host (peak 153mW)
650nm E-Bay 303 host 200mW (peak 141mW) 75% IR
650nm DVD diode Mini Mag host 54mW (my first build)
650nm dollar store mini pen 5mW X2

808nm Wicked Lasers E2 400mW (peak 598mW)

Expanders & Googles etc:
Dragon Lasers 10x Beam Expander
Dragon Lasers "new" 2x Beam Expander
Dragon Lasers DGTBF
Dragon Lasers LSG02 goggles 190-548nm
Eagle Pair SL-BLG2 goggles 190-540nm

LPM:
nospin Ophir 20c-A-1-Y MrCrouse full wrap heatsinked

Flashlights:
Fenix tk61vn

Last edited by starlight; 02-12-2015 at 07:33 PM.
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Old 02-12-2015, 09:02 PM #29
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Default Re: RGB Diffraction Grating

Starlight, which camera did that come out of, do you know? I have no idea what that mirror is for either.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 02-12-2015, 09:21 PM #30
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Default Re: RGB Diffraction Grating

Quote:
Originally Posted by Alaskan View Post
Starlight, which camera did that come out of, do you know? I have no idea what that mirror is for either.
it was from a Samsung 61in DLP TV. I wanna know if it moved in some way. Why does it have power to it.





__________________
Lasers:
405nm E-bay 303 host (peak 113mW) 13% IR dead
405nm Ehgemus host 900mW (peak 635mW 3E lens) had 2 both died in first minute
450nm home made labby NUBM44 6w (peak 7.2w)
445nm Ehgemus RPL host 3W (peak 3.5W)
445nm home made labby 3W (peak 3.1W)
445nm 501b by Blord 2.5W (peak 2.7W)
447nm Dragon Lasers Spartan 1W (peak 1.3W)
520nm custom Ehgemus host NDG7475 1W (peak 1.5W)
520nm Ehgemus host PL520-B1 120mW (peak 143mW)
532nm labby 500mW (peak 630mW)
532nm Dragon Lasers Viper 75mW (peak 122mW)
532nm C6 host (peak 103mW)
532nm E-Bay 303 host 200mW (peak 95mW) 15% IR
589nm Dragon Lasers Spartan 50mW (peak 115mW)
650nm C6 host (peak 153mW)
650nm E-Bay 303 host 200mW (peak 141mW) 75% IR
650nm DVD diode Mini Mag host 54mW (my first build)
650nm dollar store mini pen 5mW X2

808nm Wicked Lasers E2 400mW (peak 598mW)

Expanders & Googles etc:
Dragon Lasers 10x Beam Expander
Dragon Lasers "new" 2x Beam Expander
Dragon Lasers DGTBF
Dragon Lasers LSG02 goggles 190-548nm
Eagle Pair SL-BLG2 goggles 190-540nm

LPM:
nospin Ophir 20c-A-1-Y MrCrouse full wrap heatsinked

Flashlights:
Fenix tk61vn

Last edited by starlight; 02-12-2015 at 09:38 PM.
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Old 02-13-2015, 03:10 AM #31
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Default Re: RGB Diffraction Grating

You're going to need some adjustable mounts whether you use the prism or dichros. Usually it's easier to adjust using dichros fixed to mounts than try and adjust the laser heatsink/holder so that it correctly aligns with the prism.
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Old 02-13-2015, 05:30 AM #32
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Default Re: RGB Diffraction Grating

Here are the two types of relatively inexpensive adjustable mirror mounts I have found, which do you prefer yourself Bionic-Badger and why? I've heard one of the two types doesn't require readjustment, the other will, can you confirm that for me? Maybe you or someone has something better to recommend?



A: Once set, you can leave it?

B: Requires periodic re-tweaks?

This is a test, answering will provide a plus rep :P (When I asked each seller which was better, theirs or the other, they both said theirs, of course).
__________________

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

Laser Safety: http://www.laserpointersafety.com/index.html

Sam's Laser FAQ: Sam's Laser FAQ: Welcome Page

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
.........................
PhotoB****t high jacking you too? Use this link instead:
http://imgbb.com

High resolution of my avatar: https://ibb.co/fWOhXF

Last edited by Alaskan; 02-13-2015 at 03:11 PM.
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