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Old 09-11-2017, 01:13 PM #1
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Default Green laser with 2 power modes?

I'm looking for a handheld green laser that can produce 5mW and perhaps with a switch or dial, produce up to 30mW or even 50mW.

I found one online here that has dual power 5mW / 50mW:

High Powered Laser Pointers | SKYtech Lasers

But this company seems to be out of business!

Any help is appreciated.



Last edited by survd; 09-11-2017 at 01:18 PM.
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Old 09-11-2017, 02:24 PM #2
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Default Re: Green laser with 2 power modes?

Hello, and welcome survd. As a new member you might want to go to the "welcome" thread and introduce yourself, tell us a bit about yourself and say hi.

Anyways at the top of the page there are some links from some reputable company's if your interested in buying a Laser. I believe you will find want your looking for. Just please read up on Laser safety in case you havn't already. Welcome enjoy and be safe.
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Old 09-11-2017, 05:25 PM #3
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Default Re: Green laser with 2 power modes?

Definitely make a post in the welcome section.

If you're looking for Sky, they still sell to my knowledge, but their manufacturer stopped, so you might have to get anything you'd want from them soon.

This is probably what you're looking for:
SKY 30mW-50mW 3-Mode 520nm Green Laser Pointer Pen (Black)
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Old 09-11-2017, 06:25 PM #4
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Default Re: Green laser with 2 power modes?

Hi,
Welcome introduction please , where are you from , why you joined the forum ETC... Enjoy your stay and be safe..

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Old 09-11-2017, 09:31 PM #5
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Default Re: Green laser with 2 power modes?

Welcome, survd. Do please make an introductory thread.

@Rivem. Did you look at the specs on that laser you linked to? Not possible.
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Old 09-11-2017, 10:22 PM #6
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Default Re: Green laser with 2 power modes?

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Originally Posted by paul1598419 View Post
@Rivem. Did you look at the specs on that laser you linked to? Not possible.
What's odd with the specs? I was just linking the same LaserBTB laser OP linked just from a (currently) active seller.
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Old 09-11-2017, 10:44 PM #7
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Default Re: Green laser with 2 power modes?

I was looking at the specifications of the 520nm laser they offer with TEM00 transverse mode, M2<1.2, etc. This is a direct diode laser. It can't have a TEM00, nor M2<1.2. I'm not saying there is anything wrong with the link. Just the claims made by it.
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Old 09-11-2017, 11:51 PM #8
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Default Re: Green laser with 2 power modes?

Quote:
Originally Posted by paul1598419 View Post
I was looking at the specifications of the 520nm laser they offer with TEM00 transverse mode, M2<1.2, etc. This is a direct diode laser. It can't have a TEM00, nor M2<1.2. I'm not saying there is anything wrong with the link. Just the claims made by it.
You're right. I'd put it up to Chinese marketing trying to put as much information as possible. Maybe they thought TEM00 meant any round single dot.

Either way, the product and seller have been legitimate in the past. They're marked up from laserbtb, but it's the only place still selling them now.
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Old 09-12-2017, 12:20 AM #9
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Default Re: Green laser with 2 power modes?

It seems to me they have taken the specs from a 532nm DPSSL and used them to describe this one. It is the only way I can see for so many wrong claims. Aside from that, it might be a perfectly good direct diode 520nm laser, if not a bit over priced. If it is the only place to get what survd is looking for, then I suppose it is what it is.
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Old 09-12-2017, 12:26 AM #10
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Default Re: Green laser with 2 power modes?

Quote:
Originally Posted by paul1598419 View Post
It seems to me they have taken the specs from a 532nm DPSSL and used them to describe this one. It is the only way I can see for so many wrong claims. Aside from that, it might be a perfectly good direct diode 520nm laser, if not a bit over priced. If it is the only place to get what survd is looking for, then I suppose it is what it is.
Yep. It's really too bad you can't buy direct from laserBTB anymore. They had much better prices than Sky sells them at.

I've always liked their products and would have bought some if I had the chance. I at least got a very nice red pointer of theirs from Hap.
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Old 09-12-2017, 12:36 AM #11
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Default Re: Green laser with 2 power modes?

It's actually very hard to produce a reliable system that limits it to either 5 mW or something much greater like 50 or 100 mW.

The problem is that 5 mW for these diodes is just above threshold current, which depends on temperature as well.

Unless they have some system in there to compensate for that the power levels will only be reliable in a narrow temperature range - which could be acceptable for indoor use, but don't count on it outdoors.
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Old 09-12-2017, 12:40 AM #12
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Default Re: Green laser with 2 power modes?

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It's actually very hard to produce a reliable system that limits it to either 5 mW or something much greater like 50 or 100 mW.

The problem is that 5 mW for these diodes is just above threshold current, which depends on temperature as well.

Unless they have some system in there to compensate for that the power levels will only be reliable in a narrow temperature range - which could be acceptable for indoor use, but don't count on it outdoors.
Definitely. I wouldn't trust it to be super eye safe, so defaulting to a good red laser is probably best in risky situations.

Either way, I'm pretty sure laserBTB is the only manufacturer that made them like that, so Sky, used, or DIY driver setups are probably the only options.
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Old 09-12-2017, 01:39 AM #13
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Default Re: Green laser with 2 power modes?

There are not many options unless you have a laser diode that actually has the optical feedback sensing diode in place. These used to be common in the distant past, but i reckon most recent diodes on the market don't even have one, at least not the ones i've seen.
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Old 09-12-2017, 01:53 AM #14
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Default Re: Green laser with 2 power modes?

The SB1573N91 iteration of the 505nm diodes have them. They have been consistently measuring between 502nm and 503nm. The case is a common anode for both the LD and photo diode.
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520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
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632.8nm PMS He-Ne # 201P/ LPS-115 2mW
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650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
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Old 09-12-2017, 05:51 AM #15
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Default Re: Green laser with 2 power modes?

https://www.ebay.com.au/itm/142415542979
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Old 09-13-2017, 01:49 AM #16
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Default Re: Green laser with 2 power modes?

Thank you all for the help. I will make an introductory thread. I did read the safety information.

I didn't understand much of the technical discussion, but my take away is that it is not really possible to have a single green laser with variable power output and that the one I found for sale is probably making claims that are not legitimate.

So I guess it will be two lasers for me!
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