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532nm (Green) Laser 30mw to 50mw below 20 USD

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dgramop

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Hello all!

I am new to this forum so feel free to point out any mistakes in the way I post.

I am looking for a 532nm (Green) Laser 30mw to 50mw below 20 USD. Please try to not reply stuff like "that doesn't exist" or "for 200$ maybe" unless you are sure you have thouroughly researched. It should be hand held, not just an electronic part. Setting up should be as simple as plugging in to wall socket, or popping in a battery.

Regards,
dgramop
 
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Eudaimonium

Eudaimonium

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Your best bet for that price range is eBay.

Green Laser Pointer Pen 5mW 532nm Burning Lazer Zoomable Visible Beam Charger MT | eBay

Just grab that. Yes it technically says 5mW, but I believe that's because of some eBay/Paypal regulation nonsense. It actually outputs pretty much guaranteed somewhere within your needed range; 30 - 50mW.

Since that well below your price range, I recommend grabbing two. Since it's dirt cheap and of questionable quality, you risk unstable power, DOA, bad beam specs, or just flat out dying on you within a few days or weeks.

Grab two and you're golden.
 
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dgramop

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Eudaimonium said:
Your best bet for that price range is eBay.

Green Laser Pointer Pen 5mW 532nm Burning Lazer Zoomable Visible Beam Charger MT | eBay

Just grab that. Yes it technically says 5mW, but I believe that's because of some eBay/Paypal regulation nonsense. It actually outputs pretty much guaranteed somewhere within your needed range; 30 - 50mW.

Since that well below your price range, I recommend grabbing two. Since it's dirt cheap and of questionable quality, you risk unstable power, DOA, bad beam specs, or just flat out dying on you within a few days or weeks.

Grab two and you're golden.
Click to expand...

Thanks I will try that. If possible could you find something that actually says 50mw?
 
Eudaimonium

Eudaimonium

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dgramop said:
Thanks I will try that. If possible could you find something that actually says 50mw?
Click to expand...

Any particular reason why you cannot type "50mW green laser" into eBay search?

That up there is literally second search result from "green laser".

Like I said, I dunno, I don't think you can sell Class III and up lasers on eBay that's why they say 5mW, BUT they say "burning" as well. Which really means "Yeah we must type 5mW but it's actually more like 50mW or so."

If eBay's not your think, I recommend O-like.com or LaserBTB.com, see what you can find there.
 
Apocalypse

Apocalypse

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H2Oxide

H2Oxide

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Apocalypse said:
Also, as with all 532nm DPSS pointers, you have to worry about the IR element.
Click to expand...

Yes, IR is a real problem with cheap DPSS lasers. As Eudaimonium said, it will more than likely be 50mw+, but a lot of that will be IR. So while it may burn matches, it might not be as bright as a 50mw green laser.
 
Eudaimonium

Eudaimonium

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H2Oxide said:
Yes, IR is a real problem with cheap DPSS lasers. As Eudaimonium said, it will more than likely be 50mw+, but a lot of that will be IR. So while it may burn matches, it might not be as bright as a 50mw green laser.
Click to expand...

Actually, IR output from pen modules is horribly uncollimated (best seen if you can filter out the green and use phone camera or other).

So if you had 200mW green laser but only 5mW of that was IR, it still wouldn't light any matches. IR output diverges horribly and actually doesn't pose much of a thread.

If the green laser lights a match, it outputs a ton of 532nm goodness. And those cheap ebay pens are best green output for money, IMO.
 
H2Oxide

H2Oxide

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Eudaimonium said:
Actually, IR output from pen modules is horribly uncollimated (best seen if you can filter out the green and use phone camera or other).

So if you had 200mW green laser but only 5mW of that was IR, it still wouldn't light any matches. IR output diverges horribly and actually doesn't pose much of a thread.

If the green laser lights a match, it outputs a ton of 532nm goodness. And those cheap ebay pens are best green output for money, IMO.
Click to expand...

Why would the IR have poor divergence? DPSS lasers generally have rather good beam profiles even without correction optics right? And I'd assume the SHG efficiency in a cheap pen to be <50%? Is the HR coating really good enough to keep IR <5mw?

Either way, these lasers dump way to much power into the crystals to not use a filter IMO.
 
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Davidx

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dgramop said:
Hello all!

I am new to this forum so feel free to point out any mistakes in the way I post.

I am looking for a 532nm (Green) Laser 30mw to 50mw below 20 USD. Please try to not reply stuff like "that doesn't exist" or "for 200$ maybe" unless you are sure you have thouroughly researched. It should be hand held, not just an electronic part. Setting up should be as simple as plugging in to wall socket, or popping in a battery.

Regards,
dgramop
Click to expand...

Did you try a Google search before you asked these very nice people to do your research for you?. Pretty cool to have people from around the world assist you.
The forum is full of wonderful people. Some increadably intelligent people here ready to help a newbie. I don't see where you are from, or your age.
Love the part where you actually tell us what not to reply "until we throughly research " your request for a cheap laser that fits your parameters..
You'd of been better off to donate your $20 here. Probably would have gotten a free laser. Just something you might want to think about.

I was tought to say, please and thank you

Regards
 
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Eudaimonium

Eudaimonium

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H2Oxide said:
Why would the IR have poor divergence? DPSS lasers generally have rather good beam profiles even without correction optics right? And I'd assume the SHG efficiency in a cheap pen to be <50%? Is the HR coating really good enough to keep IR <5mw?

Either way, these lasers dump way to much power into the crystals to not use a filter IMO.
Click to expand...

Because they're not "same beam". It's not just one beam of light with a fraction values of green or IR.

IR comes from the diode, everything that's not converted by the crystal, and a LOT is not converted. It passes through the crystal, and two optics behind it, while green is generated by the crystal (with WHOLE different characteristics from the start) and passes through those same two optic pieces meant for green.

Basically, the beam characteristics from IR and green parts of the green laser system aren't even loosely related. I've had a chance to see that for myself when I once had my green pen outside at winter, it was cold as heck. I brought it inside and pressed it on. At first I saw no output so I pointed it at some surface very near me (table top, I think) and I saw the IR output (very very faint dark red), HUGE dot, large divergence. Within few seconds the green output started fading in and instantly overpowered the IR part.

I later verified this with a set of red goggles. They block the green part, and I used a phone camera to see the IR part that goes through the goggles.

I recommend doing that same experiment if you don't believe me :)
 
H2Oxide

H2Oxide

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Eudaimonium said:
Because they're not "same beam". It's not just one beam of light with a fraction values of green or IR.

IR comes from the diode, everything that's not converted by the crystal, and a LOT is not converted. It passes through the crystal, and two optics behind it, while green is generated by the crystal (with WHOLE different characteristics from the start) and passes through those same two optic pieces meant for green.

Basically, the beam characteristics from IR and green parts of the green laser system aren't even loosely related. I've had a chance to see that for myself when I once had my green pen outside at winter, it was cold as heck. I brought it inside and pressed it on. At first I saw no output so I pointed it at some surface very near me (table top, I think) and I saw the IR output (very very faint dark red), HUGE dot, large divergence. Within few seconds the green output started fading in and instantly overpowered the IR part.

I later verified this with a set of red goggles. They block the green part, and I used a phone camera to see the IR part that goes through the goggles.

I recommend doing that same experiment if you don't believe me :)
Click to expand...

I have done the experiment, and the IR did have good enough collimation to potentially burn things if focused down alongside the green. What I don't understand is why the 1064nm radiation has such poor divergence compared to the 532nm? I would understand if there were post-SHG optics meant specifically for 532nm (aside from the HR and AR coatings), but I don't think there are in the little "5mw" eBay pens. I can understand poor 808nm divergence from the diode, that's a given, but why would the 1064nm light have poor divergence WITHOUT going through any optics not designed for it's WL? If both WLs are resonating inside the cavity, and the 532nm is allowed to pass, and the 1064nm manages to find it's way out despite the HR coating, I don't see how the beam characteristics aren't related? I still can't fully grasp every aspect of DPSS lasers, so any help is appreciated :thanks:.
 
Eudaimonium

Eudaimonium

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H2Oxide said:
I have done the experiment, and the IR did have good enough collimation to potentially burn things if focused down alongside the green. What I don't understand is why the 1064nm radiation has such poor divergence compared to the 532nm? I would understand if there were post-SHG optics meant specifically for 532nm (aside from the HR and AR coatings), but I don't think there are in the little "5mw" eBay pens. I can understand poor 808nm divergence from the diode, that's a given, but why would the 1064nm light have poor divergence WITHOUT going through any optics not designed for it's WL? If both WLs are resonating inside the cavity, and the 532nm is allowed to pass, and the 1064nm manages to find it's way out despite the HR coating, I don't see how the beam characteristics aren't related? I still can't fully grasp every aspect of DPSS lasers, so any help is appreciated :thanks:.
Click to expand...

Wow, sounds like an interesting difference between modules. Can you snap a photo of the IR output from your green laser?

Also, there ARE post SHG optics in those cheap pens. Basically their components are:
Diode -> Crystal (both crystals glues into one) -> Expander -> Collimator

Expander and collimator are obviously tuned for the green beam, to focus it down to something usable.

Difference in beam profiles is simply because of different beam source. Diode is the source of IR while crystal is the source of green. And they each start off with completely different beam specs in the first place.

I'm most curious about your module IR output. I wonder why did I come across a "shotgun" IR output module, while you have a reasonably focused one.
 
Jhop

Jhop

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Oh snap I just saw the month. Didn't notice the year sorry :whistle:
 
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