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50W LPM laser

trinh hong phuoc

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Hi everyone

Today i find a new lpm (with me) any who use it, please tell your quality

They are listed as 50w (range from 10mw-50w)
 

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BowtieGuy

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trinh, I'm not familier with that particular LPM, do let us know what you think of it. :yh:

That video that you linked in your second post, shows toutan has no idea what he's doing when it comes to measuring the output of a laser with an LPM.

You should never put the laser so close to the sensor, to get your readings, as a matter of fact, I think he put the laser right up against the sensor housing!
I wouldn't be suprised if that lasers output was only half of what he was seeng.
 

trinh hong phuoc

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I had a primary order of buying such a punishment, I was glad to find it, but I was a little hurry, the best I would PM Toutan,thank you Bowtieguy
 

BowtieGuy

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Red, it looks like that gentec LPM will measure some serious laser power, any big new projects coming up that we don't know about? :whistle:
I was wondering about the 250W max power rating, but I see that in the specs, they show a 6 second max. exposure time; probably a good idea. :yh:

Is there a minimum power specified for this unit?

Edit: Never mind, I see a 1W min. called out.
 
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RedCowboy

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I have plans for a big project however it's not under way as yet, only still planning but very willing. ;)
 

paul1598419

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I looked at both sensors and they seem to have more in common than differences. I would be very cautious buying a LPM from a Chinese seller as we have been duped before with these. That one that is rated for 250 watts doesn't seem to have the heat sinking necessary to measure powers that high. Is it for pulsed lasers only?
 

RedCowboy

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I looked at both sensors and they seem to have more in common than differences. I would be very cautious buying a LPM from a Chinese seller as we have been duped before with these. That one that is rated for 250 watts doesn't seem to have the heat sinking necessary to measure powers that high. Is it for pulsed lasers only?
5 second countdown for a single shot up to 250w or it can run continuous for up to 8w.



 
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paul1598419

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I wonder why they used an IR laser to measure power of less than a watt in this demonstration on the PRONTO-250+? I can only suspect that this is what the did as there was no visible beam profile on the sensor. In fact, they could be using a heating element to send IR uncollimated to the sensor as there was nothing to see. I would have been more impressed if they had measured a 200 watt laser for 5 seconds showing that this little sensor could take that.
 

Benm

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I think that might not have given a very nice video with the sensor ablaze after 1 second or so and then shooting out flames for the other 4 :D

The single shot feature is interesting though, if it actually works you could capture the power output of something like a pulsed YAG with it. Not that that'd be impossible to do with a fairly ordinary LPM if you know the pulse rate at it can be operated for some length of time... as long as it doesn't start ablating the sensor surface, which i suspect might be a factor here.
 

lasersbee

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That video shows the same LPM enclosure
but he was using an OPHIR 20c Sensor head.
He did not use the Head you showed on
your OP.

That video that you linked in your second post, shows toutan has no idea what he's doing when it comes to measuring the output of a laser with an LPM.

You should never put the laser so close to the sensor, to get your readings, as a matter of fact, I think he put the laser right up against the sensor housing!
I wouldn't be suprised if that lasers output was only half of what he was seeng.
Seems like I wasn't the only one to notice
that...:)


Jerry
 
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paul1598419

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I think everyone who has used a LPM before noticed that. Who puts the laser against the sensor wall when measuring the laser's output? Unfortunately, it is not the first time I've seen someone do this on YT. :banghead:
 

Benm

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Well, one reason to do so might be if you wanted to measure a diode output directly without any lenses in between - in that case you'd have to put the LD very close to (though not in contact with) the sensor to get all the light onto the sensor surface.

But with anything that produces a focused beam it's idiotic indeed.

I'm not really sure that putting the laser right against the sensor would produce higher readings though: if you heat up both the sensor surface by laser light and the sensors heatsink by thermal conduction due to physical contact, the difference between them would be smaller and you could get a lower value.
 




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