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Old 09-27-2012, 10:24 AM #1
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Default Monochromatic yellow lasers between 570-580nm?

Are there monochromatic yellow lasers between 570-580nm? Around 100mW would be nice. I would think there would be something that you could pump a non liner crystal with (DPSS) that would give something close to the “magic green” 555nm. The frequency the eye is most sensitive to. Prolly just dreaming but still had to ask.

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Old 09-27-2012, 11:37 AM #2
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Default This guy built a 20Watt CW 575nm yellow laser!

Wow this guy built a 20 Watt CW 575nm (yellow laser). Dang! This is what I call a bad ass basement project!

575nm Yellow Dye Laser - YouTube

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Old 09-27-2012, 12:17 PM #3
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Default Re: Monochromatic yellow lasers between 570-580nm?

Here... I fixed it for you...
You only need to put what is after the "="
between the [TY] Tags.




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Old 09-27-2012, 01:01 PM #4
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Default Re: Monochromatic yellow lasers between 570-580nm?

yup cool laser , not so cool for mister wallet
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Old 09-27-2012, 01:04 PM #5
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Default Re: Monochromatic yellow lasers between 570-580nm?

very nice unit.
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Old 09-27-2012, 01:14 PM #6
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Default Re: Monochromatic yellow lasers between 570-580nm?

Thanks Jerry! Got to admit this is some crazy cool stuff. All I need is a LS800 double Q switched 532 nm YAG laser to drive the dye. Have a feeling Santa is not going to give me one. With that ultra high Q system he is getting an efficiency 45% from 532nm -> 575nm with the dye. 575nm 2x3mm 0.5 mrad divergence (for real ... 0.5 mrad!?) @ 20 Watts. I saw 10 Watts on the LPM but he says he is running it at half power. That would mean his LS800 can fork out over 80 Watts of 532nm? Does that even add up?
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Old 09-27-2012, 01:58 PM #7
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Default Re: Monochromatic yellow lasers between 570-580nm?

Quote:
Originally Posted by Onryo View Post
Are there monochromatic yellow lasers between 570-580nm? Around 100mW would be nice. I would think there would be something that you could pump a non liner crystal with (DPSS) that would give something close to the “magic green” 555nm. The frequency the eye is most sensitive to. Prolly just dreaming but still had to ask.

All the best
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Yes, there are DPSS lasers that output between 532-561nm even 555nm. A Google search will prove this out quickly.

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Old 09-27-2012, 05:34 PM #8
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Default Re: Monochromatic yellow lasers between 570-580nm?

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Originally Posted by steve001 View Post
Yes, there are DPSS lasers that output between 532-561nm even 555nm. A Google search will prove this out quickly.
I was just reading a bunch on Wikipedia etc about DPSS yellow lasers. I am not all that sure they are monochromatic. .

So the 593.5 nm yellows are using a 808 nm pump diode is used to generate 1,064 nm and 1,342 nm light, which are summed in parallel to become 593.5 nm. Worst part is they are only about 1% efficient =/ Another method is to generate 1,064 and 1,319 nm light, which are summed to 589 nm. This process is more efficient, with about 3% of the pump diode's power being converted to yellow light. If I understand right (in yellow DPSS) excited electrons will have different energy states. Electrons fall and different wavelengths of energy returned as photons. The wavelengths mix and poof you get yellow. Not really monochromatic. zzzz zzzz still awake I could be all wrong so please correct me if I am.

As far as power goes. I like huge Godzilla balls hanging off of my lasers! At 1-3% efficiency I would prolly need some rather large (unprotected) Li-Ions to get 1 Watt The xanthan dye setups are looking juicy!

All the best
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Old 09-27-2012, 05:58 PM #9
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Default Re: Monochromatic yellow lasers between 570-580nm?

Monochromatic just means that the light is centered around a very narrow band of wavelengths (there is an infinite number of wavelengths between, say 400nm and 401nm).

I think 589nm is a similar DPSS process to green lasers. DPSS lasers are monochromatic because although the process involves different wavelengths of light, the end product is light of "one" wavelength. Not two or three combined.
589nm lasers are used to calibrate telescopes for atmospheric turbulence by creating a "guide star." If the laser was just a yellow and green beam combined, it would not work.

594nm or 593.5 or whatever is produced by sum-frequency generation. I won't pretend to understand the physics involved but from the bits I can pick out, the photons are effectively "smashed" together. This is not the same as combining two beams like in a projector. It actually does produce one wavelength.

If you pass a 589nm beam or a 594nm beam through a diffraction grating or prism, only one beam will exit. If the beams were just combined "colors" diffraction and refraction would separate the beam into it's constituent parts.

Last edited by RA_pierce; 09-27-2012 at 06:05 PM. Reason: proofreading
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Old 09-27-2012, 07:20 PM #10
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Default Re: Monochromatic yellow lasers between 570-580nm?

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Originally Posted by RA_pierce View Post
Monochromatic just means that the light is centered around a very narrow band of wavelengths (there is an infinite number of wavelengths between, say 400nm and 401nm).

I think 589nm is a similar DPSS process to green lasers. DPSS lasers are monochromatic because although the process involves different wavelengths of light, the end product is light of "one" wavelength. Not two or three combined.
589nm lasers are used to calibrate telescopes for atmospheric turbulence by creating a "guide star." If the laser was just a yellow and green beam combined, it would not work.

594nm or 593.5 or whatever is produced by sum-frequency generation. I won't pretend to understand the physics involved but from the bits I can pick out, the photons are effectively "smashed" together. This is not the same as combining two beams like in a projector. It actually does produce one wavelength.

If you pass a 589nm beam or a 594nm beam through a diffraction grating or prism, only one beam will exit. If the beams were just combined "colors" diffraction and refraction would separate the beam into it's constituent parts.
Correct - although orange/yellow lasers use a process called sum frequency generation where the crystal lases at multiple wavelengths, the resultant beam is of a single wavelength.

The video posted in this thread is great as well, a very good example of a flowing dye laser being pumped by a q-switched frequency doubled YAG.

Most dye lasers are wavelength tunable as well depending on the cavity design.
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Old 09-27-2012, 07:51 PM #11
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Default Re: Monochromatic yellow lasers between 570-580nm?

theres OPSl 577nm , but min power modules ive seen are 3W .
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Old 09-27-2012, 07:52 PM #12
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Default Re: Monochromatic yellow lasers between 570-580nm?

I just realized that these are the wavelengths before hitting the non linear crystal. So the 1064nm => 532nm (normal green) + 1342nm => 671nm (red) = yellow. But the light is truly monochromatic? Multiple wavelengths can become a single wavelength in the case of light? OK so there are photons with a new defined quanta of energy that correlates to yellow? Are you saying that the new frequency (wavelength) is the sum the energy state of the two photons? I really got to dive into this geekery This is truly a case of light behaving both like a wave (can mix etc) and a discrete partial (photons) with defined energy states.
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Old 09-27-2012, 09:04 PM #13
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Default Re: Monochromatic yellow lasers between 570-580nm?

In normal frequency doubling, yes, two photons are effectively combined or smashed together to double their frequency, or half their wavelength. 1064 nm to 532 nm, 946 nm to 473 nm, etc.

I'm not going to pretend that I know anything about the other types of DPSS ... because I don't. :P
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Old 09-27-2012, 10:07 PM #14
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Default Re: Monochromatic yellow lasers between 570-580nm?

It's one of each. You combine their energy, and their energy is inversely proportional to their wavelength: lower wavelengths have higher energy per photon.

e1 + e2 = e3
1/λ1 + 1/λ2 = 1/λ3

λ3 = 1/(1/λ1 + 1/λ2)

1/(1/1064 +1/1342) = 593.5

Similarly, you use the 1319 line for 589.
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Old 09-28-2012, 12:48 AM #15
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Default Re: Monochromatic yellow lasers between 570-580nm?

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It's one of each. You combine their energy, and their energy is inversely proportional to their wavelength: lower wavelengths have higher energy per photon.

e1 + e2 = e3
1/λ1 + 1/λ2 = 1/λ3

λ3 = 1/(1/λ1 + 1/λ2)

1/(1/1064 +1/1342) = 593.5

Similarly, you use the 1319 line for 589.
Hmm ... so basically what you did is invert the wavelength λ into the frequency domain and then summed the frequencies to the new λ3. That part I am cool with. What I am thinking about the actually energy content of the photons "packets". Since Planck's constant is just that ... a constant. The only way to change the frequency (expressed as wavelength ) would be by changing the mean amount of energy per photon. Can photons be added or do they mind their own business? If the two wavelengths actually become one (monochromatic) then light is acting like a wave ... but its not really a wave (oh crap this is leading into quantum mechanics) Its a quanta of energy. That frequency/wavelength is just a manifestation of the "packet" energy in the photon?

IIll try to leave it at that and just except the fact that I love burning stuff with my lasers and marvel at the beams More important I don't want to put people to sleep with this.

All the best and thx of the equations!
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Old 09-28-2012, 12:55 AM #16
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Default Re: Monochromatic yellow lasers between 570-580nm?

Boring =)
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