Old 05-25-2013, 02:06 AM #1
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Default How to tell mW

Hey Guys,

I recently purchased a green 100mW laser, but I'm not sure that it is actually 100 mW (The seller sold it to me with no sticker, which is highly suspicious) - I want to know if there are any tests I can do to prove what mW it is.

I have tried
  • Cutting black electrical tape
  • Lighting a match
It could not accomplish either task, but the reflected dot is still pretty bright, and leaves me with an afterimage for a couple of seconds.

Any advice?

-Frodo.


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Old 05-25-2013, 02:50 AM #2
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Default Re: How to tell mW

Use your laser power meter. Don't have one? See the following thread.

Thread: What if I don't have a laser power meter.
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Old 05-25-2013, 03:03 AM #3
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Default Re: How to tell mW

Dang, beat me to it. You could try burning tests as rough estimation, but it's not very accurate due to focusing, light absorption, etc. Watch the video styropyro made, it's very good at addressing general power abilities. I would say your laser could range from 5mW to 50mW, no real way to saying though. Did you try coloring the match tip black? Focusing the laser onto the blackened match tip or onto the electrical tape?

EDIT: Also, watch out for leaking IR that you can't see. Even if the green laser light doesn't enter your eye, if the IR laser light does it can still damage your eyes.
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Old 05-25-2013, 03:10 AM #4
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Default Re: How to tell mW

burning tests dont work for rough estimations. a poorly focused 1W 445nm wont burn but yet a focused 100mW 532nm will burn. ONLY way to tell power is with a LPM, plain and simple, no argument needed
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Old 05-25-2013, 03:25 AM #5
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Default Re: How to tell mW

True. However, if all the lasers are focused... it can't be terribly difficult
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Old 05-25-2013, 03:43 AM #6
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Default Re: How to tell mW

Yeah a LPM is a tool that every fan of lasers should have.
There is a stickie that has a list of all users with LPM all arround the world. Maybe someone is near you and you can ask him to check your laser, usually is done for free...
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Old 05-25-2013, 03:47 AM #7
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Default Re: How to tell mW

One day, when a LPM costs as much/less than a laser...
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Old 05-25-2013, 04:59 AM #8
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Default Re: How to tell mW

Quote:
Originally Posted by hwang21 View Post
One day, when a LPM costs as much/less than a laser...
In the mean time hobbyists and sellers will keep fooling themselves to rationalize why they don't need an LPM

Peace,
dave
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Old 05-25-2013, 06:49 AM #9
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Default Re: How to tell mW

Quote:
Originally Posted by FrodoBaggins View Post
...the reflected dot is still pretty bright, and leaves me with an afterimage for a couple of seconds.

Any advice?

-Frodo.


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Old 05-25-2013, 08:26 AM #10
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Default Re: How to tell mW

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Originally Posted by Lazerbeak View Post


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Thanks for the replies guys, I think what I will do is look for someone with a LPM that I know, if I can't find anyone, I'll just send it off to one of the members of this forum in that thread.

With regard to glasses, I'm in the process of looking for and buying some. They're quite expensive, but you can't put a price on vision. Can someone make a recommendation for some good glasses for me? I'm only using green lasers - But there are just so many choices, and I'm a bit overwhelmed with all of them
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Old 05-25-2013, 08:48 AM #11
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Default Re: How to tell mW

I got a pair from here...
Safety
around $40 and a forum member. I actually need to pick up a pair for green myself

These are pricey but I hear are very good, I wouldn't mind having a pair...
Thorlabs - Certified Laser Safety Glasses

In my Sig is some good info. Sigurthr's post describes how to make a beam shroud so you can enjoy high powered beams without glasses, which can be nice They're easy to make and it's nice to just enjoy the beam sometimes.

I'm a big noob too, so don't be put off, just enjoy yourself safely



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Old 05-25-2013, 09:11 AM #12
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Default Re: How to tell mW

Quote:
Originally Posted by Lazerbeak View Post
I got a pair from here...
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I actually need to pick up a pair for green myself
Which ones did you buy? If they were for 445's and up to 540 nm they will protect from 532. If you want to check, look up the abs vs wavelength graphs on the eagle pair website...
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Old 05-25-2013, 09:17 AM #13
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Default Re: How to tell mW

Quote:
Originally Posted by grainde View Post
Which ones did you buy? If they were for 445's and up to 540 nm they will protect from 532. If you want to check look up the abs vs wavelength graphs on the eagle pair website...
Derp, Thanks Grainde! That's awesome, I didn't even think about that at the time I was only buying for blue and red at the time. I'm getting a 520nm that'll work out perfect.

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Old 05-25-2013, 09:19 AM #14
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Default Re: How to tell mW

Hello Frodo, what country are you in? It will make a difference how people advise you. If you can afford some medium priced glasses then take LazerBeaks advice and buy from here: Safety
If you need something cheap I can recommend these: HDE® Laser Eye Protection Safety Glasses Goggles for Green Blue Lasers W/ Free Hard Case - Amazon.com
Remember some 532nm lasers are IR filtered and some are not.

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Old 05-25-2013, 01:18 PM #15
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Default Re: How to tell mW

Hello Frodo. The link of members with LPMs can be found in my sig. Good luck, and eye safety and all that.
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The Bastard:445nm, 2W M-140 UF KF-T60
445nm, 9mm, 3.2W Kryton Groove-Polished
450nm Osram PL450B, 130mW, Kryton Groove-Polished
La Spada Verdi: 1st Ever PL520 MS-SSW 115mW
532nm, 100mW, Taped to Sanyo 18650/3100mAh
638nm Opnext, 160mW, Kryton Groove-Polished
650nm LPC-826, 360mW, MXDL Host Kit by Mrcrouse
650nm <5mW Laser Pointer/UV LED/LED flashlight NEBO 5063


5W Ophir 20C-A-1Y LPM
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Old 05-25-2013, 04:02 PM #16
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Default Re: How to tell mW

Quote:
Originally Posted by Pi R Squared View Post
Hello Frodo, what country are you in? It will make a difference how people advise you. If you can afford some medium priced glasses then take LazerBeaks advice and buy from here: Safety
If you need something cheap I can recommend these: HDE® Laser Eye Protection Safety Glasses Goggles for Green Blue Lasers W/ Free Hard Case - Amazon.com
Remember some 532nm lasers are IR filtered and some are not.

Alan
I would never recomend that second pair! The first pair at survival laser are great but the second pair are junk. If you want a cheap pair then go to the yellow link in my signature and look under safety. The uvex pair are much better than those but they still dont protect for IR.
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Laser collection:
Blue & Black Marble Kryton Groove 445nm- 2.65W with 3 element lens, G2 untested
Polished Minisabre V2 462nm - 250mW
Red & Black Marble Kryton Groove 635nm- 500mW
Custom Titanium PL520- stable 80mW



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