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Old 08-30-2010, 10:36 PM #17
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

I think the 1150nm or more likely 1178nm how does this work, does a 1064nm become a 532nm by frequency doubling (or halving because if you double 1064 you dont get 532) to make it visible?

so if thsts the case, I think that 405 and 445 lasers are not dpss's but they could be? if you wanted to be inefficient as hell but wouldnt it work?

say a 808nm becomes a 404 or 405nm - and 1085nm become 542nm for a greener green?

if you look at this cni page that shows all the nm's of there lasers they have it seams that the IR ones if doubles (or halved) will create the colored ones they have from green to yellow and some others

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Old 08-31-2010, 03:55 AM #18
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

Quote:
Originally Posted by leftkidney View Post
I think the 1150nm or more likely 1178nm how does this work, does a 1064nm become a 532nm by frequency doubling (or halving because if you double 1064 you dont get 532) to make it visible?
*SCIENCE BREAK*

Actually, it is frequency doubling. Light is a type of wave, with a wavelength (the space between peaks of the wave) measured in nanometers for light, and a frequency (how many waves pass/second) measured in Hertz. Wavelength (expressed as the Greek lambda character) * frequency (the f character if I remember correctly) always equals the speed of light. Or, in an equation:

w * f = c

Where w is wavelength, f is frequency, and c is the speed of light (a constant). So when you frequency double, you have to halve the wavelength to keep c a constant.

In the end, this means that frequency doubling a 1064nm wavelength IR light gives you a 532nm wavelength green light.
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Old 08-31-2010, 03:58 AM #19
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

Thank you for that. I need a nice and juicy science break every now and then.

Just remember there are more solid state "DPSS" systems than just frequency doubling. Some of those wavelengths are *Very hard to get. Look at some of the violets that CNI offers. 2-3mw max!
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Old 08-31-2010, 04:25 AM #20
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

There is such a thing as a 404nm DPSS laser. However at the powers and cost effectiveness of 405nm diodes, few people are willing to pay out the wazoo for a couple of mW of 404.
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Old 09-01-2010, 03:25 AM #21
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

Quote:
Originally Posted by jedirock View Post
*SCIENCE BREAK*

Actually, it is frequency doubling. Light is a type of wave, with a wavelength (the space between peaks of the wave) measured in nanometers for light, and a frequency (how many waves pass/second) measured in Hertz. Wavelength (expressed as the Greek lambda character) * frequency (the f character if I remember correctly) always equals the speed of light. Or, in an equation:

w * f = c

Where w is wavelength, f is frequency, and c is the speed of light (a constant). So when you frequency double, you have to halve the wavelength to keep c a constant.

In the end, this means that frequency doubling a 1064nm wavelength IR light gives you a 532nm wavelength green light.
That was an amazing way to explain it! I didn't get it until now, although thats more of a Math break since you used mostly equations....but +rep for the great explanation man!
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Old 09-01-2010, 08:57 PM #22
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

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Originally Posted by Meatball View Post
Just remember there are more solid state "DPSS" systems than just frequency doubling.
Yep. Frequency doubling is also referred to as second-harmonic generation, and you can also get third harmonic generation for "frequency tripling", and other special-cases of nonlinear optical behavior. Doubling and tripling are special cases of frequency summing. You can think of it as almost combining 2 photons, both of the same wavelength to get a new one at half the wavelength. But you can also sum 2 photons of different wavelengths, which is what you're getting with the 593.5 and 589nm lasers.

At least one way to make 593.5 is from using a BiBO (BiB3O6) crystal to combine the 1064 and 1343nm output lines from a Nd:YVO4 crystal, which can pumped by an IR laser diode at something like 808nm.

At least one way to make 589 is from using a periodically-poled LiTaO3 to combine the 1064 and 1319nm output lines from a Nd:YAG crystal, which can also be pumped by an IR laser diode at something like 808nm.
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Old 09-01-2010, 09:20 PM #23
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

I've got a cool little 355nm pulsed laser at home that throws 808nm light from 2 diodes into Nd:YAG to produce 1064nm. Part of the 1064nm output is doubled via non-linear crystal to 532nm.. THEN another non-linear crystal sums the frequencies of the resulting 532nm and leftover 1064nm to produce 355nm UV.. the final output is termed "frequency tripled"

The math involved in this summing of frequencies is as follows:

(1/532)+(1/1064) = 0.002819

1/0.002819 = 354.666667 or 355nm for short.

594nm and 589nm lasers also rely on frequency summing to produce yellow, but the wavelengths being summed are obviously different, and they depend on the lasing medium used..

EDIT: PBD already said much of this.. apologies for the redundancy.
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Old 10-30-2010, 06:39 AM #24
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

CNI has the 593.5nm and 589nm laser.
Yellow Laser, 589 nm yellow DPSS lasers.
593.5 nm yellow orange laser.
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Old 10-30-2010, 04:49 PM #25
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Default Re: Where to buy good yellow/orange lasers or laser diodes?

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Please don't spam. This thread is both old, and from someone asking originally about DIODE lasers.. which they were informed don't exist yet, at least outside a lab, in the requested wavelengths.

Trust me, everyone who can afford CNI products here knows who you are, and knows what you offer already.

Though it looks like you've already got one warning about product spamming from TJ.. Don't earn more by continuing it's practice unless you have something new that's not advertised anywhere yet.
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