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Old 12-24-2015, 09:36 PM #33
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Default Re: CNI and their 604/607nm DPSS...

Quote:
Originally Posted by joeyss View Post
any idea how much current they use and % efficiency? ( the 561)
"optical-to-optical efficiency of ∼10.6% . This is, to the best of our knowledge, the highest CW output power at 561 nm of a diode-pumped frequency doubled Nd:YAG laser." from https://www.osapublishing.org/josab/...=josab-30-1-95

Also see: https://www.rp-photonics.com/yellow_...ge_lasers.html



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Old 03-14-2016, 02:13 PM #34
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Default Re: CNI and their 604/607nm DPSS...

I currently have 2 Pr:YLF crystals at hand. Going to try them in the following months. We'll see if I can get any orange/red out of them :-)

But their fluorescence is much weaker than I expected - I can see the Pr lines but that's about it, probably my pump laser had slightly wrong wavelength... It barely shines red... If any of you seen Pr:YLF crystals - how did their fluorescence looked to you? Any suggestions are welcome.
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Old 03-14-2016, 05:15 PM #35
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Default Re: CNI and their 604/607nm DPSS...

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Originally Posted by BarsMonster View Post
I currently have 2 Pr:YLF crystals at hand. Going to try them in the following months. We'll see if I can get any orange/red out of them :-)

But their fluorescence is much weaker than I expected - I can see the Pr lines but that's about it, probably my pump laser had slightly wrong wavelength... It barely shines red... If any of you seen Pr:YLF crystals - how did their fluorescence looked to you? Any suggestions are welcome.
What WL is your pump diode? Pr:YLF's highest absorption peak is at 443nm, so it would probably be worth it to spectro the diode and try to keep the wavelength as close to 443nm as you can via TEC. Also, for better results you can regulate the crystal temperature as well.

You will of course need the appropriate HR and OC mirrors as well to make it lase.

If you don't mind me asking, where did you acquire said crystals?
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Old 03-14-2016, 06:19 PM #36
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Default Re: CNI and their 604/607nm DPSS...

You can get them by request from a few places, but simply having a random Pr:YLF isn't enough. They need the right cut, as well as the right length, dopant level, coatings, and mirrors you also need many watts of a good quality, phase matched beam. Pr3+ doesn't like to lase, and simply running a 445 through it isn't going to do it. And it lases mostly in the red and IR if I remember correctly. Green, blue, and orange are much harder to get. I've seen it done with something like a 5W argon as well as a 1-2W diode, and both cases they didn't get much out. A diode would work, but it needs to be temperature monitored and very preferably single mode at 443, and a very high laser quality correction lens would be needed bare minimum. We used a 100mm lens in our experiment AR coated and 2 dedicated mirrors specially for it.
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Old 03-14-2016, 06:27 PM #37
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Default Re: CNI and their 604/607nm DPSS...

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Originally Posted by ultimatekaiser View Post
you also need many watts of a good quality, phase matched beam.
Please excuse my ignorance, but isn't phase matching only required for NLO processes?
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Old 03-14-2016, 06:31 PM #38
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Default Re: CNI and their 604/607nm DPSS...

Excuse me for writing that in a hurry. But yes you're right, but does still help greatly to stablize the input. Depending on the type of cavity you want...You wouldn't need to do it for a linear cavity. (Though it will still help a lot)
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Last edited by ultimatekaiser; 03-14-2016 at 09:38 PM.
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Old 03-14-2016, 07:21 PM #39
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Default Re: CNI and their 604/607nm DPSS...

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Originally Posted by ultimatekaiser View Post
but simply having a random Pr:YLF isn't enough. They need the right cut, as well as the right length, dopant level
Mine are 4mm long, 0.7%. What are the effects of the cut?

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Old 03-14-2016, 07:32 PM #40
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Default Re: CNI and their 604/607nm DPSS...

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Originally Posted by BarsMonster View Post
Mine are 4mm long, 0.7%. What are the effects of the cut?
0.7% should work, based on what I've read. It should probably be cut along the a or c axis of the crystal. IIRC the cut effects the IOR of the crystal.
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Old 03-14-2016, 07:33 PM #41
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Default Re: CNI and their 604/607nm DPSS...

That is quite a bit on the smaller side, but should work as long as your beam input is very small and well managed, and the surfaces are AR coated for both wavelengths. Your input will need to be perhaps .1mm though or smaller. Higher the density the more efficiency you're going to get. Just be careful not to mar the crystal. what are your mirror coatings and curvatures and reflectivities, etc? Keep in mind that Pr3+ Is self re-absorbing, much like Ruby so you have to overcome that. It'll have a high threshold compared to a YAG
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476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
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496.5nm: Argon Ion Line
501.7: Argon Ion Line
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520nm: Trustfire A8 Custom

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543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
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561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
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Last edited by ultimatekaiser; 03-14-2016 at 07:34 PM.
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Old 03-14-2016, 07:52 PM #42
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Default Re: CNI and their 604/607nm DPSS...

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Originally Posted by ultimatekaiser View Post
That is quite a bit on the smaller side, but should work as long as your beam input is very small and well managed, and the surfaces are AR coated for both wavelengths. Your input will need to be perhaps .1mm though or smaller. Higher the density the more efficiency you're going to get.
Smaller side on doping or length? My hope was to not going that tight on input or even do side pumping... Is it already lost? :-)

Quote:
Originally Posted by ultimatekaiser View Post
what are your mirror coatings and curvatures and reflectivities, etc? Keep in mind that Pr3+ Is self re-absorbing, much like Ruby so you have to overcome that. It'll have a high threshold compared to a YAG
For first tests my intention was to go with flat-flat. This way I can start with 99.5% dichroic mirrors I already have. Crystal AR coatings 0.5% for both wavelengths, but I will try to improve this.

I've seen data that cooling Pr:YLF crystal to 10C improves the results. Does it help to cool it further?
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Old 03-14-2016, 08:31 PM #43
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Default Re: CNI and their 604/607nm DPSS...

You need the small diameter to get anything. And you can't really side pump it Without HUGE power input. You need a really high power input, and that's the typical way it's done, even with a yag. It's a bit to short for side pump, but I suppose not impossible. It's not that realistic. Cooling the crystal probably does help, as it probably helps with depopulation. Just don't let the temperature change too rapidly or you'll crack or micro-fracture the crystal.

You'll need to use something like a hemispherical or long radius cavity-something concave. To be frank a plane-plane resonator is pretty much impossible unless the gain is exceptionally high. And even then it's quite nasty and math-y to do and unstable. They're typically used in VERY high power YAG lasers, and even then it's not a true planar resonator, as they're taking advantage of the heat to utilize thermal lensing, making it concave.

The paper that I'm reading here says they used two 50cm curved mirrors, and another says they used a hemispherical config, with the crystal in the center in the focal point in both cases. Optimal OC is about 2-3.5% transmission depending on input.

You will need specialty mirrors for this. Regular helium neon laser mirrors won't work. You'll end up with red instead, as the emission at 640 is far stronger.
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405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors

Last edited by ultimatekaiser; 03-14-2016 at 10:36 PM.
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Default Re: CNI and their 604/607nm DPSS...

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Originally Posted by ultimatekaiser View Post
You need the small diameter to get anything. And you can't really side pump it Without HUGE power input.
I got some intel that someone ordered 0.2% crystal. Is this something which could help when working with thicker beams?
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Old 03-15-2016, 01:10 AM #45
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Default Re: CNI and their 604/607nm DPSS...

Someone did it with a low dopant but longer crystal for better efficiency at one point. It's still a growing study. Where'd you order yours from just out of curiosity? The dimensions of the crystal generally are in relation to the cavity setup. The one we used here was 2x2x6mm DBAR 444/609. I think it was doped higher though around 1% iirc, and was pumped by a 'circularized' 1.1W 445nm laser diode. It was spectro'd lower though since it wasn't driven full power.
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Old 03-15-2016, 01:11 AM #46
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Default Re: CNI and their 604/607nm DPSS...

Feel like I suddenly walked into the foreign language thread lol
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Old 03-15-2016, 01:23 AM #47
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Default Re: CNI and their 604/607nm DPSS...

same here...
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Old 03-15-2016, 01:25 AM #48
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Default Re: CNI and their 604/607nm DPSS...

Me three, and I started the damn thread. :/ lol
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