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Old 06-18-2014, 01:59 AM #17
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Default Re: 575nm Dye Yellow laser

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Originally Posted by IsaacT View Post
Also...who is that guy? He is a wizard of photons. Seriously he does so many cool things with lasers! The dye laser, the liquid nitrogen cooled Mits diodes. Too cool.
He is member "planters" on the <other> forums (coughPL). He is also Planters here as well, but hes much more frequent to the other forums


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Old 06-18-2014, 03:59 AM #18
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Default Re: 575nm Dye Yellow laser

^^ yes, I've got a link to a vid in my 650nm build thread. I got the best results using a generic off brand sharpie.
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Old 06-18-2014, 04:22 AM #19
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Default Re: 575nm Dye Yellow laser

Nice.. Such a beautiful colour.. I have always wanted a lime green around 570nm..
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Old 06-18-2014, 04:29 AM #20
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Default Re: 575nm Dye Yellow laser

570 wouldn't be lime green, it would be yellow
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Old 06-18-2014, 06:58 PM #21
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Default Re: 575nm Dye Yellow laser

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^^ yes, I've got a link to a vid in my 650nm build thread. I got the best results using a generic off brand sharpie.
You've got some serious trapping skills. Never managed to hold it for more than a couple seconds.
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Old 06-18-2014, 08:48 PM #22
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Default Re: 575nm Dye Yellow laser

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Originally Posted by Atomicrox View Post
You've got some serious trapping skills. Never managed to hold it for more than a couple seconds.
Aside from when I shot that video, I only got a good one like that maybe 1 or 2 other times. Most of the time I got alot of small, short lived particles. I did discover that wire glue can "rejuvenate" the sharpie once it stops producing particles.
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Old 06-20-2014, 05:08 PM #23
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Default Re: 575nm Dye Yellow laser

What a sweet color...
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Old 07-01-2014, 10:59 AM #24
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Default Re: 575nm Dye Yellow laser

He must be a wizard with those kind of lazors..
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Old 07-01-2014, 11:07 AM #25
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Default Re: 575nm Dye Yellow laser

Also, That beam is massively awesome
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Old 07-04-2014, 03:38 AM #26
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Default Re: 575nm Dye Yellow laser

I want to interject here. I just saw this thread and there are some statements that I want to correct. The laser system I presented in the video is not that expensive. More than $1,000 and much, much less than $10,000, It is not delicate at all and although some owners of these KTP lasers use them to pump dyes many use the 40 or so watts of green for high power aerial displays which involves trucking them to remote sites and running them in some weather.

Almost all dye lasers that use a system like mine operate with sulforhodamine to generate around 620nm. I modified the optics and the dye mixture to operate at 575nm because that remains a rare and otherwise nearly impossible color to generate.

To avoid optical damage many dye lasers will pump the dye as it free flows a short distance from a nozzle to a receptacle. These are notoriously messy. To date I have not had a single leak or stain (knock on wood) and there is no odor.

Now, for the bad news. These are VERY dangerous. I'm not talking about the risks that anyone here faces, who has worked with multi-watt diodes and occasionally seen a flash of reflected light. The average amount of pump light that is required to get a dye to lase is dependent on the instantaneous intensity. Only very high quality CW 532nm lasers can be focused tightly enough to provide enough gain in the dye for lasing. The beam out of this laser is not nearly good enough, so this laser is Q switched. By using a pulsed radio frequency (MHz) a small silica crystal is forced to change its refractive index slightly and deflect the fundamental (1064nm) beam just enough to prevent lasing operation. The YAG continues to receive arc lamp input and the energy is stored until the Qswitch reverts to a non-deflected state and then BOOM, a pulse with tens of kW of power fires into the dye and it lases. This happens at a rate of 10-20kHZ, so it looks continuous, but even turned down to a couple of watts (average) it can cut steel. No kidding, I've done it.

I am now working on a solid state Raman shifted vanadate laser based on my DPSS laser that is designed to produce watts of output at 588nm. So, we'll see if it's possible to get away from dye and pulsed lasers.

Now what's with the cough, cough? There is nothing wrong with participating on LPF or PL as I see it. What am I missing?

Incidentally, the other videos on the Tech Ingredients site might be interesting (I'm prejudiced) for those that haven't seen them.
https://www.youtube.com/user/TechIngredients

Hope this helps.
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Old 07-04-2014, 04:07 AM #27
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Default Re: 575nm Dye Yellow laser

Thank you for dropping in, Planters. The "cough" was just me thinking back to previous link filters that could lead to automatic bans, but those have long since been changed.

On what order of power would a 532 need to be to enable the dye to laser?
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Old 07-04-2014, 04:37 AM #28
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Default Re: 575nm Dye Yellow laser

Hi Planters! Thanks for taking the time to come and update us!

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The laser system I presented in the video is not that expensive. More than $1,000 and much, much less than $10,000
Wow, prices have come down a lot it seems. My pricing guesstimates are from my days working in a lab in the late 90s. I knew I'd be off some, but didn't realize I was off by more than 75%.

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Originally Posted by planters View Post
To avoid optical damage many dye lasers will pump the dye as it free flows a short distance from a nozzle to a receptacle. These are notoriously messy. To date I have not had a single leak or stain (knock on wood) and there is no odor.
That is an excellent track record. The one I saw in person was VERY smelly and there were stains all over it. I remember there being a tremendous amount of trouble with turbidity and getting a usable stream.

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I am now working on a solid state Raman shifted vanadate laser based on my DPSS laser that is designed to produce watts of output at 588nm. So, we'll see if it's possible to get away from dye and pulsed lasers.
Wow, the golden holy grail. I think they use something similar in astronomical observatories to guide the telescopes. Actually I'm not sure what the gain medium for those stellar lasers are, perhaps it is some Na+ Ion system. Please do record lots of video and feel free to post any findings or related info here on the forums as you see fit. I can pretty much guarantee you'll get a good reception. We've very much enjoyed watching the videos you've posted so far.
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Old 07-04-2014, 08:13 AM #29
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Default Re: 575nm Dye Yellow laser

Awesome! Lots of good info
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Old 07-04-2014, 01:16 PM #30
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Default Re: 575nm Dye Yellow laser

Some of my background with lasers is in fact from work with adaptive optics for astronomy. The sodium guide star programs began with tuned dye lasers and have now moved to custom tuned diodes that operate at 1178nmnm and single mode fiber amplifiers integrated with SHG fiber doublers. These all solid state units produce more than 20 W of very narrow band 589nm light and are already deployed at ESO.

The threshold for dye laser action in practical dye cavities with real world losses is between 50 to 100 kW/cm^2. If you can focus down to a 30 um spot a 1W 532 beam will work, but the alignment will be very tough because the pump and the waist of the dye laser mode have to overlap and if the 532 is converging to this point in a sharp cone it needs to focus very near the surface of the dye otherwise much of the pump light will be absorbed while it is still unfocused and it will never reach the necessary intensity at its focus. This is why Q switched pumping is so attractive.
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Old 09-19-2015, 03:40 AM #31
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Default Re: 575nm Dye Yellow laser

Really sorry for the necro but this video (and all of planters videos) is just so damn cool and I think more people need to watch it/them.

Anyway, I'd really like to know more about particle trapping. One member here said he used an off brand sharpie to do this with a relatively low powered red. Can anyone please explain to me how that was done.

Also, if anyone hasn't checked out planters (Tech Ingreients on YouTube) channel ,once again, I HIGHLY recommend you do. He has some really cool new ones up and is by far the best DIY laser hobbyist I have ever seen!
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Last edited by Glutton; 09-19-2015 at 03:41 AM.
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Old 09-19-2015, 01:14 PM #32
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Default Re: 575nm Dye Yellow laser

Quote:
Originally Posted by Glutton View Post
Really sorry for the necro but this video (and all of planters videos) is just so damn cool and I think more people need to watch it/them.

Anyway, I'd really like to know more about particle trapping. One member here said he used an off brand sharpie to do this with a relatively low powered red. Can anyone please explain to me how that was done.

Also, if anyone hasn't checked out planters (Tech Ingreients on YouTube) channel ,once again, I HIGHLY recommend you do. He has some really cool new ones up and is by far the best DIY laser hobbyist I have ever seen!
I saw this a couple years ago and it was laser ****. I've always loved true yellow (570-580nm) and was disappointed to find that they didn't exist (not small enough to be put in handhelds anyways). 589nm's amber color just doesn't cut it.

Edit: I guess that word is censored. Let's just say uh... very beautiful pictures.

Last edited by Apocalypse; 09-19-2015 at 01:15 PM.
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