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Old 11-06-2013, 04:49 AM #1
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Default 445 pump diodes?

I was wondering tonight what the possibilities might be for using some of the high power 445nM diodes we've grown to know and love as pump sources for DPSS lasers. Are there any crystals that can be pumped @ 445nM? And if so what would the output wavelength(s) be?

Just curious as to whether or not we might see some new DPSS wavelengths using a shorter wavelength pump source than the usual 808nM. This seemed like the place to ask


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Old 11-06-2013, 05:22 AM #2
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Default Re: 445 pump diodes?

The only thing that comes to mind is ruby, but 405nm would be more useful to pump with.

That would lase at 694nm though, so it's hardly worth it unless you're just aiming to pick up an interesting project.

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Old 11-06-2013, 08:25 AM #3
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Default Re: 445 pump diodes?

Iīve seen something about this about one year ago in the TV news where they showed a prototype 3 color laser unit where the blue laser was spiltted and pumping a green and a red laser. They didnīt say anything about the wavelenght. Just that the blue was a laserdiode also used to pump the other two lasers.

In the video you could clearly see the two cristals being pumped by the blue laser light and the company said once they get the efficiency increased they will be going into mass production to offer cheaper laser units for laser TVs and projectors.
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Old 11-06-2013, 08:38 AM #4
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Default Re: 445 pump diodes?

Cni has a new 607mm dpss Laser pumped with 445
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Old 11-06-2013, 12:11 PM #5
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Default Re: 445 pump diodes?

Quote:
Originally Posted by shokkunlasers View Post
Cni has a new 607mm dpss Laser pumped with 445
If thats so, i'd assume their 604nm is 445 pumped as well. How did you find this out?
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Old 11-06-2013, 12:33 PM #6
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Default Re: 445 pump diodes?

A while back there was a post about a white light laser using only a 445nm diode -- oh it was mentioned. They did state the wavelengths though...
Four crystals come to my mind.
Pr:PAYAC (521/607/639)
Pr:YLF (604)
Cr:LiSAF (420-440) -- (note much more efficient with 660nm pump)
(and as trevor said) Possibly Ruby
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Old 11-06-2013, 02:10 PM #7
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Default Re: 445 pump diodes?

Here is a video of such a laser and the pump laser is a 445nm.
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Old 11-06-2013, 03:00 PM #8
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Default Re: 445 pump diodes?

White LEDs are simply blue LEDs (~450nm) with a phosphor coating. Phosphor doped glass slurry is then slathered on top of the LED.

Most sources generalize this phosphor as a Cerium doped yttrium-aluminum garnett, Ce3+:YAG.

From what I understand, the YAG provides a certain type of structure for the rare earth ions to live in. Perhaps since the doped YAG is not a solid single crystal in LEDs, is why the process doesn't create white laser light when pumped with a laser?
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Old 11-06-2013, 06:07 PM #9
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Default Re: 445 pump diodes?

^ I know nothing of LEDs and their structures. Just nonlinear laser optics
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Old 11-06-2013, 08:15 PM #10
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Default Re: 445 pump diodes?

Where did you get all your knowledge, raffle? Seems like you know how every DPSS process is done...
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Old 11-06-2013, 08:52 PM #11
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Default Re: 445 pump diodes?

Google scholar & my own estimations. Currently learning OPSL... it's not too much different than DPSS actually.
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Old 11-12-2013, 10:54 PM #12
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Default Re: 445 pump diodes?

Thanks for the replys folks. Hmmm, a 607 would be ...novel. But that bench full of Pr doped crystals. THAT's what I'm talking about!

Now then which kidney to sell for that crystal set............
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Old 11-12-2013, 10:58 PM #13
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Default Re: 445 pump diodes?

You'd be surprised that high powered 607's (not talking 10mW, talking 150+) can be had for <$3000. Less than $2500 if you take out shipping costs.

That's actually a very good price for what it is... but I still don't have that money to spare
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Old 11-13-2013, 03:53 AM #14
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Default Re: 445 pump diodes?

On this topic- do you know what and how they dope the crystals? Pr:PAYAC, Nd:YVO4, etc.
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Old 11-13-2013, 03:57 AM #15
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Default Re: 445 pump diodes?

In all honesty I do not, but if I were to guess I would say they have specific quantities present when they grow the crystals. Too lazy to google this late.
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Old 11-13-2013, 04:51 AM #16
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Default Re: 445 pump diodes?

... but I still don't have that money to spare -----I feel ya' mon.

I would say they have specific quantities present when they grow the crystals.----right you are.
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