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Here's a few pictures of a 20mW yellow in operation:
LPF Donation via Stripe | LPF Donation - Other Methods
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ArcticMyst Security by Avery
593.5nm 20mW Portable
- Thread starter FrothyChimp
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maxkillz
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woah thats awesome 
why do you get all the cool toys to play with
is this in East Lansing, MI? I live within 45 minutes of there ;D
why do you get all the cool toys to play withis this in East Lansing, MI? I live within 45 minutes of there ;D
jamilm9
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Nice! is the pump diode a 2-watt?
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*Drool* The color is awesome.
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Can I have one as a review unit?
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Jimmymcjimthejim said:
Sure for $1722.60
This unit is going to a well known university along with a 473nm OEM, 532nm lab and a 457nm lab and two sets of glasses. In fact it's already shipped.
brtaman
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Frothychimp, how was the stability of the laser? Due to the complex nature doubling 2 lines etc. and based on members experience with their ~5mw 593 portables. I would say jumping all over the place? Or was it quite stable? I would assume that it uses a TEC element to control temperatures, if it was indeed quite stable.
I am sure that the pump diode was in excess of 2 probably even 3W. Got any details on those specs? What was it averaging, and of less importance what was its peak in testing?
Thanks,
brtaman
I am sure that the pump diode was in excess of 2 probably even 3W. Got any details on those specs? What was it averaging, and of less importance what was its peak in testing?
Thanks,
brtaman
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Honestly, portable yellows are not any fun. The units are very stable, however, maintaining the yellow output across the entire operating envelope. One issue is high power portable yellow lasers are heat magnets. Because of the nature of frequency summation you are essentially running two lasers within the cavity and thus generating a LOT of heat from pumping. Duty cycle on the 20mW is 30 seconds on with a couple minutes off. It may be because the unit peaked at 40mW and operated at 30mW. These systems really have no active cooling. The TEC only works over the 30 seconds because heat builds up on the hot side and has no where to go. Conduction only works so fast. I'm not a big fan of portables as I like to turn on a laser and let it run. As an expensive novelty it's kind of neat but I suspect the university that purchased this will be back for a real lab yellow before long.
brtaman
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I completely agree on the part of limited thermal cooling available in portable lasers (very cool as novelties though). You can have all the TEC power you want, what matters is removing the built up heat from the hot side, this can be done passively through mass as you mentioned or actively (I always used a copper block attached to 1/2 inch tubing cooled by water rushing through a huge copper radiator, even with this system water heat build-up was an issue without actively cooling the radiator with huge fans, though it was a 226w pelt). Like the Wicked Lasers Spyder II, with a TEC being one of its main features, the lack of mass means that not only is it not stable it heats up faster than it would without the TEC.
In a way its somewhat surprising that higher power portables (excluding hercules), have not adopted some sort of fan based cooling system to aid the tec. Fans can be found in extremely small packages and due to their brushless design would not be to big of a drain on the power source. This sort of system would not be that hard to implement into a laser, while it could potentially decrease weight. With active cooling the amount of mass needed would go down drastically. Looking at PCs for instance a CPU with 35w thermal specs needs a tiny ammount of actively cooled alu or cu to run within its parameters.
BTW: What was the pump diodes output in that laser, I am really interested how much 808 it takes to produce that much yellow. Oh and the 50mw is mighty impressive!
Thanks
brtaman
In a way its somewhat surprising that higher power portables (excluding hercules), have not adopted some sort of fan based cooling system to aid the tec. Fans can be found in extremely small packages and due to their brushless design would not be to big of a drain on the power source. This sort of system would not be that hard to implement into a laser, while it could potentially decrease weight. With active cooling the amount of mass needed would go down drastically. Looking at PCs for instance a CPU with 35w thermal specs needs a tiny ammount of actively cooled alu or cu to run within its parameters.
BTW: What was the pump diodes output in that laser, I am really interested how much 808 it takes to produce that much yellow.
Oh and the 50mw is mighty impressive!Thanks
brtaman
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brtaman said:I completely agree on the part of limited thermal cooling available in portable lasers (very cool as novelties though). You can have all the TEC power you want, what matters is removing the built up heat from the hot side, this can be done passively through mass as you mentioned or actively (I always used a copper block attached to 1/2 inch tubing cooled by water rushing through a huge copper radiator, even with this system water heat build-up was an issue without actively cooling the radiator with huge fans, though it was a 226w pelt). Like the Wicked Lasers Spyder II, with a TEC being one of its main features, the lack of mass means that not only is it not stable it heats up faster than it would without the TEC.
In a way its somewhat surprising that higher power portables (excluding hercules), have not adopted some sort of fan based cooling system to aid the tec. Fans can be found in extremely small packages and due to their brushless design would not be to big of a drain on the power source. This sort of system would not be that hard to implement into a laser, while it could potentially decrease weight. With active cooling the amount of mass needed would go down drastically. Looking at PCs for instance a CPU with 35w thermal specs needs a tiny ammount of actively cooled alu or cu to run within its parameters.
BTW: What was the pump diodes output in that laser, I am really interested how much 808 it takes to produce that much yellow.
Thanks
brtaman
TEC is great for a labby where you don't care about power usage. But I'm at a loss as to why wicked put one in a portable. I myself have been scavenging through old laptops looking for a heat pipe - http://en.wikipedia.org/wiki/Heat_pipe - that I can build into a host...
I'm surprised I haven't seen it done already on this forum actually. Up to 200 MW/m² heat flux for free(Dependent on Delta T as is TEC) beats spending power on it. Plus that leaves more power for a small fan if one does want to go balls to the wall.
And that is indeed a very impressive display of yellow! ;D
cheers,
kernelpanic
brtaman
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Yeah heatpipes are definatelly a way of removing heat, just the fundamental problem of removing the heat from the entire system remains in the sense that it will remove heat from the hot spot better, but what will cool the hot end of the heatpipe. You are still left with cooling mass that you had in the beginning. Thats why I am thinking active with a fan, like hercules.
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That's what I'm sayin'
A heat pipe with a fan is way more efficient for a handheld than a TEC...
cheeers,
kernelpanic
A heat pipe with a fan is way more efficient for a handheld than a TEC...
cheeers,
kernelpanic
