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Old 10-23-2010, 01:14 PM #1
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Default How to proof that your 1.5W does not meet the spec if you don't have a LPM

For this test i used other logical means instead of irrational means to make a estimation of the power of a under spec laser,.....

1. If you can't light the papers on fire even if you have a steady hand and it is properly focused for this job,.................

2. Next to the arctic your new 1.5W laser has a shorter reach,......

3. This 1.5W 445nm laser burns a hole true 1 thin white Sony CD box(HWS2-4) in 6 seconds,.......

***** If any other members has other ideas post them here.



Last edited by Nanolaser; 10-24-2010 at 07:55 PM.
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Old 10-23-2010, 01:21 PM #2
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

It needs to be a specific type of paper to actually catch on fire and not just burn.

As for having shorter reach, hmmm how would you measure that?
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Old 10-23-2010, 02:12 PM #3
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

My 445 laser focused can burn trough white paper ( not set it on fire ) and it's not more than 1 watt
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Old 10-23-2010, 02:15 PM #4
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

My 1W can light paper on fire
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Old 10-23-2010, 02:16 PM #5
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

my 400mW titan will eventually burn through white paper ( 1 min), but it goes through sharpied white paper like nothing.
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Old 10-23-2010, 03:23 PM #6
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

Quote:
Originally Posted by Nanolaser View Post
For this test i used other logical means instead of irrational means to make a estimation of the power of a under spec laser,.....

1. If you can't light the papers on fire even if you have a steady hand and it is properly focused for this job,.................

2. Next to the arctic your new 1.5W laser has a shorter reach,......



***** If any other members has other ideas post them here.
The fact that many members have LPM's means that few sellers will even attempt
to sell an underspec laser..

The only true way to verify is to have it checked by a calibrated LPM.
You can send it to another member, or just save up a few bucks and
get an LPM for the new lasers you build or buy.

I would imagine that trying to determine power by the speed and or
ease it lights paper on fire or even slices through black tape etc,
would make it difficult to determine.


You could also take a stab at mariomasters DIY LPM. The parts can
be obtained cheaply, and can be calibrated against a laser with a known
output.

Even if it were 'off' by 20-50mW, you would still get a better idea than
trying to guess by burning materials...
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Old 10-23-2010, 03:45 PM #7
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

My 120mW 405nm can burn thru white paper in about 5-10 seconds
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Old 10-23-2010, 04:25 PM #8
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

An LPM is going to be the only way to accurately determine output.

There are too many factors when burning stuff. Distance, multi-mode vs single-mode, focus and light absorption rate for the material you are trying to burn with a specific wavelength.
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Old 10-23-2010, 04:29 PM #9
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

If youŽre interested IŽll test the laser on my LPM.
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Old 10-23-2010, 05:00 PM #10
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

Unless it is GROSSLY underpowered, you cannot tell anything by visual observation and/or burning. You NEED an LPM.

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Old 10-23-2010, 05:07 PM #11
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

Diode current would be a good indicator of output power unless the diode is damaged. Damage can often be detected by the beam pattern.
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Old 10-23-2010, 05:59 PM #12
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

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Diode current would be a good indicator of output power unless the diode is damaged. Damage can often be detected by the beam pattern.
There is too much variation in the diodes being used.
A couple 445nm diodes I used varied by ~125mW at the same current with the same lens.
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Old 10-23-2010, 06:17 PM #13
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

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There is too much variation in the diodes being used.
A couple 445nm diodes I used varied by ~125mW at the same current with the same lens.
I have seen bigger swings than that. Over 200mW in some cases.
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Old 10-23-2010, 06:53 PM #14
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

Anway, what about burning true 20 CD's like pianoman2011 is referring to in this thread :

~1.5W 445nm Laser Burning Things
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Old 10-23-2010, 07:04 PM #15
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

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Anway, what about burning true 20 CD's like pianoman2011 is referring to in this thread :

~1.5W 445nm Laser Burning Things
It is still going to depend on how it is focused and a host of other items. If focused correctly you can instantly blow a hole in a single CD case with that laser.

And his laser is actually peaking over 1.6W.

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Old 10-23-2010, 07:34 PM #16
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

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My 120mW 405nm can burn thru white paper in about 5-10 seconds
i don't belive that ( video plz )
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