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Old 08-10-2011, 08:06 PM #1
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Default multicolor laser praseodymium

Anyone already heard of this?

‪Blue semiconductor laser excitation - praseodymium multicolor laser : Kannari's Group‬‏ - YouTube


I didn't get it exactly how that laser works.
Here is what I got:

A 445nm diode pumps or oscillates the praseodymium glass which produces either green, red or orange.

But I didn't get how the colors are defined or can be changed...

anyway hopefully we can get one day these 521nm, 639nm and 607nm (!!!) in portables


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Old 08-10-2011, 08:47 PM #2
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Default Re: multicolor laser praseodymium

Nice! I want one of those laser cyrstals! With the proper mirrors, they can probably oscillate at red and green at the same time. Add the blue and you have the easiest white laser ever! Or a line selecting prism to pick a wavelength of choice, or doubling to UV, many possibilities.
It looks like a 4 level laser, so no problems with a high threshold. The quantum efficiency for the red is relatively low, so diodes may be a better option there, for display application separate modulation is needed anyway.
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Old 08-10-2011, 10:13 PM #3
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Default Re: multicolor laser praseodymium

The output wavelength is determined by the mirrors. Getting white out of it would require very expensive mirrors. HR coatings to support 3-4 wavelengths are difficult to find so I hear.

But anyways, here's the info: http://www.hzdr.de/db/Cms?pOid=29566



http://www.laserfreak.net/forum/down...e.php?id=17456
http://cmdo.in2p3.fr/IMG/pdf/Camy_CM...eau_nov_08.pdf
http://cmdo.in2p3.fr/IMG/pdf/M2_Benayad_JNCO_2009.pdf

Thanks to 300EVIL on PL for the links and info!



That red has a very nice gain slope, and the orange is not too far behind!

Check out that single mode 445nm dot in the video!
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Old 08-11-2011, 02:15 AM #4
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Default Re: multicolor laser praseodymium

That is epic!
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Old 08-11-2011, 03:35 AM #5
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Default Re: multicolor laser praseodymium

Thats so cool, you can quite literally watch a blue laser enter the glass lense and a green laser exit it
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Old 08-11-2011, 01:11 PM #6
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Default Re: multicolor laser praseodymium

Very interesting stuff....
I wonder who will win out and be first for
projectors... this process or the Green LD...

Jerry
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Old 08-12-2011, 03:40 AM #7
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Default Re: multicolor laser praseodymium

^ i hope they both make it in one form or another, as much as i would love a green LD, that wavelength conversion is just too cool not to have.
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Old 08-12-2011, 04:00 AM #8
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Default Re: multicolor laser praseodymium

Quote:
Originally Posted by Gryphon View Post
Thats so cool, you can quite literally watch a blue laser enter the glass lense and a green laser exit it

:O I missed that, at what point in the video do you see that
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Old 08-12-2011, 07:37 PM #9
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Default Re: multicolor laser praseodymium

I love nonlinear optics and frequency doubled lasers are awesome, but to have a blue pump diode and a crystal laser directly in green (or yellow or red, take your pick) is even more awesome because the whole process is visible.
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Old 08-12-2011, 10:37 PM #10
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Default Re: multicolor laser praseodymium

Quote:
Originally Posted by lazerman121 View Post
:O I missed that, at what point in the video do you see that
At 1:49 you can see the blue laser being focused by the lense toward the bottom right of the screen, it passes through the new crazy light converting lense in the middle and out shoots the green laser in the top left.
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Old 08-13-2011, 05:00 AM #11
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Default Re: multicolor laser praseodymium

Kind of old as it was posted awhile ago but VERY cool technology.
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Old 08-13-2011, 11:10 AM #12
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Default Re: multicolor laser praseodymium

Yeah it's very interesting indeed. Maybe also for a handheld.
For example you could have a 3in1 laser with only 1 laser diode: the 445nm.

So you don't need room for 3 lasers in one host like it is now with the RGB laser.
But then on the other side I guess you couldn't mix the colors. It would "only" be possible to make 3 colors out of 1 aperture.
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Old 08-13-2011, 12:23 PM #13
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Default Re: multicolor laser praseodymium

I have yet to hear of any optics that would allow such a thing..
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Old 08-14-2011, 11:26 PM #14
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Default Re: multicolor laser praseodymium

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I have yet to hear of any optics that would allow such a thing..
Oh, yeah? The mirrors are the easy part. Not a problem. Have two sets setting in a drawer right now.

I use mirrors that are 400-700 nanometer, broadband, 99.5% reflective 0-45 degree incidence all the time, and usually about 25$ for a square inch.

One Stop Laser Shop in Florida sells broadband dielectric white mirror in small pieces. Usually if I aim a watt at it, I see less then 200 uWatt in leakage.


I have optics that allow 13 lines to lase. 750$ a set new, in singles, cost goes down to 500$ a set in 10s. HR is 99.95% reflective and OC is 2.4% transmissive, medical diagnostic laser optics (Mixed gas ion of course)

Yes, I've had 13 lines up at once. Very, very white. 800 mW of Aircooled white.

I do not expect the Chinese to copy those mirrors for another 10 years, made in the USA.

1.4 - 3.5% transmission is actually easier to have coated, you just leave off 3-4 layers in the chamber setup.

Setup charge would probably be 1500$ for the design fee for a 80 layer coating.

If I just specified leak 1.5% across the visible spectrum, instead of controlled transmission at all the different lines, it would be much cheaper.

This is not a problem. The single mode blue diode is the expensive part.
If you could pump it with the new 1 watt 380-405 nm singlemodes (yes, they exist), it would be a lot cheaper, but even those are 500$ in single pieces.

The doped fiber version is much cheaper, but when I tried to order the fiber, the company really was not interested in selling just 10 meters, even at 200$ a meter. I had a potential customer that would easily consider paying 5000$ in parts for 200 mW of yellow.

BTW, I'm not rich, I called up the optics company and asked if they had any overruns. The 750$ set went out the door for 250$, minimum order two sets. This was not a easy, normal, happening. It took considerable effort and patience. Some times such things happen, usually a Act of God, ie HE wants it to happen. They made over-runs in case any of the good production lot was rejected. They laughed all the way to the bank, because the cost of the over-run was already paid for.


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