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Old 09-04-2013, 11:13 PM #1
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Default How to make LPM?

Hi i'm new to the forms and laser making so i'm sorry if this has already been asked or if i have posted it in the wrong section.

Does anyone know how to make a LPM on the cheap?
I don't really care about the accuracy as long as is fairly accurate like in a 200mw range as i'm going to use it to measure high power lasers.
I also have a arduino and i am familiar with the code(not sure if that helps?).
and one of my hobbies is electronics so i'm not a total noob lol.

P.S sorry if i made some spelling mistakes or wrote anything back to front i posted this just after midnight


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Old 09-04-2013, 11:17 PM #2
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Default Re: How to make LPM?

send a message to ARG......he can help you out and FYI 200mW is not high powered
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Old 09-04-2013, 11:23 PM #3
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Default Re: How to make LPM?

thanks for the info ow and sorry i meant it can be 200mw off like say the laser is 2500mw it would register 2300mw
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Old 09-04-2013, 11:33 PM #4
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Default Re: How to make LPM?

oh yeah that makes sense now that i re-read it. if you buy or build a LPM that can be 200mW off then you have a piece of junk LPM......an ophir at 2.5W at most should be 125mW off if its 5% off. anything more than 5% is junk and not worth the time or money. Most ophir should be within 1% if not spot on.
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Old 09-05-2013, 12:50 AM #5
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Default Re: How to make LPM?

Any metrology enthusiasts will tell you there is a big difference between 1% and spot-on . I think the ophir heads are 3%-class devices.
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Old 09-05-2013, 12:53 AM #6
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Default Re: How to make LPM?

you got my point though
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Old 09-05-2013, 01:34 AM #7
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Default Re: How to make LPM?

DIY Ophir setups can run you around $200-300 which is really good considering the surplus heads are around $700 new. Best deal going IMO. Plus you can always expand later on.

If that is too much, try this DIY thermal LPM for under 50$
DIY Thermal LPM for under $50
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Old 09-05-2013, 12:40 PM #8
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Default Re: How to make LPM?

Note that the "$50 LPM" is nothing more than an amp that provides a reading. You'll need to get calibration data about your sensor so that you know what that reading actually corresponds to (e.g. the power). Once you've bought on a sensor maybe you can get someone on the forum to perform tests on it to get you that calibration data.
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Old 09-05-2013, 03:14 PM #9
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Default Re: How to make LPM?

A stable laser with a known power can be used as well.
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Old 09-05-2013, 11:18 PM #10
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Default Re: How to make LPM?

I think you'd need two, or a tunable laser to have at least two datapoints.
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Old 09-05-2013, 11:26 PM #11
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Default Re: How to make LPM?

It would be a good idea, to account for any non-linearity.
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