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Thread: V/P ratio Power meter from 100W Yag laser unit. Company ''Laser" PC1064A ; AP2027100

  1. #1
    Join Date
    Aug 2016
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    Default V/P ratio Power meter from 100W Yag laser unit. Company ''Laser" PC1064A ; AP2027100

    Hello,

    This is my first post ever.

    I want to confirm the output power of a laser unit that I bought from eBay. I have a nice laser power meter from another disassembled laser, two in fact, but I can't find any info about the meters online. You can see the meter in the photos below. The numbers on it are PC1064A on the PCB and AP2027100 on a label sticked on it, but nothing comes up when I Google them. It has an OP07 op-amp IC as a voltage amplifier, which was the only useful info I have, because there are datasheets available for it. So from that I was able to figure out how to connect power and read the sensor by looking where the pins from the IC go. I get about 1.5V reading on the output pin when aiming the unconfirmed 20W laser. But I really don't know how to interpret those 1.5 Volts without any info about the sensor. Therefore, I can't really confirm the 20W power, which is what I'm interested in. So all I really need is the Voltage/Power ratio for the sensor and if it stays linear over the range. Does anyone here owns a laser like that or knows anyone who might know about it? I also attached a photo of the laser. It's a 100W Yag laser. Any lead on where to look or ask would be very helpful.

    Muchas Gracias.

    P.S. I'm a laser noob at the moment.
    Attached Thumbnails Attached Thumbnails IMG_1629.JPG  

    IMG_1630.JPG  

    IMG_1632.JPG  


  2. #2
    Join Date
    Mar 2015
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    Cambridgeshire, England
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    I believe that laser head is from a Sharplan laser; did you buy this from a chap in Essex by any chance? (I'm assuming you're in the UK)
    The power detectors probably won't do you any good as they will not be calibrated; you'll need access to a calibrated power meter or a known laser of the same wavelength in order to calibrate those sensors.
    As a newbie, I'd be VERY careful around that laser head, 100W of invisible laser radiation is seriously dangerous; may I suggest you start off with something a lot safer, i.e. visible and considerably less powerful. The Sharplan lasers are often used for surgical procedures, think of it as an invisible scalpel - not something you would want to come across accidentally!

  3. #3
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    Aug 2016
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    Yes, I think he was from Essex. I just received a message from him in eBay, and he's saying that it might have been 100mV/W, so I'm actually probably getting 15W, but he's not really sure about it. Says that's how the sensors are usually set up. In terms of precision, I would be fine if the measurement is +/- 1W off. Would just like to know the approx ratio.
    So what you're saying is that each sensor has a little different V/Power ratio, even if made by the same brand and there is no way of actually knowing it without using another laser of a know power and calibrating from that?

    I actually want to measure the power of a different laser unit which is supposed to be 20W, also ~1064nm, but yes, still I know about the dangers. Getting my eyes in the beam or a strong reflection and I'm very likely a blind person for life. Nice comparison - invisible scalpel... Sounds scary.. The 100W laser in the picture is currently in a non-working state. The lamp is dead and I don't have the lamp's power supply either. Maybe will try to pump it with diodes at some point, if I get a hold of any high output 808nm.

    You both, suggested that I might try to use a laser of a know power and the same wavelength. Will try to find if my Uni has something and if they can help out. Thanks for help NobleGas

  4. #4
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    Mar 2015
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    Cambridgeshire, England
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    Quote Originally Posted by SpacefaringDog View Post
    So what you're saying is that each sensor has a little different V/Power ratio, even if made by the same brand and there is no way of actually knowing it without using another laser of a know power and calibrating from that?
    Yes, that's pretty much it; even when calibrated, you'll be in the region of 1% accurate at best, the sensorswere never intended for laboratory precision measurements.
    Quote Originally Posted by SpacefaringDog View Post
    Getting my eyes in the beam or a strong reflection and I'm very likely a blind person for life. Nice comparison - invisible scalpel... Sounds scary..
    Not only that, but there's a strong chance of mysterious fires starting unexpectedly!
    Quote Originally Posted by SpacefaringDog View Post
    The 100W laser in the picture is currently in a non-working state. The lamp is dead and I don't have the lamp's power supply either. Maybe will try to pump it with diodes at some point, if I get a hold of any high output 808nm.
    I think that's the same 100W laser I'm thinking of, he mentioned the failed lamp in the auction I seem to remember.

  5. #5
    Join Date
    Aug 2016
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    Yeah, probably the same then. Bought it last spring. Mainly just for taking apart and learning about lasers, the price was really cheap imo anyway. But my main interest is lasers >200W. Currently out of my scope. My dream is a CNC laser machine for cutting metal, that's how I got into this

    I already burnt a little hole in the wall of my room. But on purpose, as I still need to paint and fix few places anyway.

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