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Thread: laser power meter sper 840011

  1. #1
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    Default laser power meter sper 840011

    hello I was wondering if any one has service data for these hand held meters? i was to see if i can expand the range by about 10x for short times? that would give me rang to 400mw, i was thinking a voltage divider will work as i believe these just use a silicon sensor with a cheesy conversion chart for the curve of the sensor, it works great for sub 40mw lasers but with cheaper higher out put modules available now its getting limited in what i can use it for

  2. #2
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    Best to just get a calibrated beam splitter wedge or a 90/10 coated beam splitter. You could also use a very high grade Adsorptive Glass ND filter, but picking the right one is tricky. ND filters need to be calibrated.

    For a wedge, the Fresnel reflection from each surface of air to normal, uncoated, glass is about 3.97% at smaller angles. It changes quite a bit with larger angles. So a thick or wedged piece of glass lets you separate out the two Fresnel reflections.

    Wedges are nice because the two ghost beams come off at a decent angle. Flats have the beams very close together. Thicker flats give you more beam separation. IN A TIGHT SPACE YOU WANT THE WEDGE!

    Flat:
    http://www.surplusshed.com/pages/item/pm1041.html

    Wedge:
    http://www.edmundoptics.com/optics/p...e-prisms/27679

    You might find a cheaper wedge at SurplusShed, Anchor Optics or on Ebay.

    Steve
    Last edited by mixedgas; 01-03-2015 at 06:34.
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  3. #3
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    Thanks for the info, thats a lot easier to do then what i was planning lol

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