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    What is the best efficiency on visible wavelengths?

    Hello Not sure if this should be in general, science or measurements section. After getting familiar with the fact that 532 nm lasers have a lousy efficency and that they waste 300 mA for nothing before starting to operate, and that my "5 mW" green pen uses 1.14W (for a nominal efficiency of...
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    How powerful are 5 mW eBay pointers in reality?

    I assume my best bet would be an LPM and a good handful of random pen lasers. Then I would have much choice with brightness and power and beams and I wouldn't have to spend more than 50 dollars (price plus postage) to get a single good pointer. Question is, how to get a good enough LPM without...
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    How powerful are 5 mW eBay pointers in reality?

    Tested my green pointer. It draws about 390 mA. How does this sound? One of my violet pointers draws 150 mA. The one with too much dispersion. The other is 210 mA. Orange one 45 mA. Red one 90 mA.
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    How powerful are 5 mW eBay pointers in reality?

    Hello After getting six "5 mW" pen pointers, two 405 nm (violet), two 635 nm (orange), one 532 nm (orange) and one 650 nm (red) I wonder if these really are all 5 mW pointers. The red one is misaligned, and in addition to the dot, there is a semi-arc around it. The two orange ones were equally...
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    Mail order suitable glasses for 50mW green?

    I assume I'd be happy with OD 2 or OD 3 glasses, thus lowering the 50mW to 0.5mW or 50uW, i.e. class II. But are there such certified glasses available anywhere for IR and 532nm? Or is there any way to "certify" any of the available "toy glasses"? Someone with an accurate laser power meter and...
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    Mail order suitable glasses for 50mW green?

    I have been looking at Nova Shields Professional. I assume these are certified glasses. But these have OD 6 at 532nm, my wavelength of interest. Does it mean that these will pass one part in 1 000 000 of the light? So if I shine a 50mW directly into my eye, these will make it 50nW (totally safe)...
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    Mail order suitable glasses for 50mW green?

    Hello I'd like to mail order protective glasses for me and the whole family. I need trustworthy and standardized glasses that a professional would use while working with class 3b equipment. I need IR and green protection. But how dim should the glasses be? How strong glasses does one need to...
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    50mW green, how worried should I be?

    I was to a doctor, about an year ago, for this exact reason. The examination involved dilating the pupils and looking into the eye. But there were no findings and the doctor told me not to worry too much. I am seriously nearsighted and use eyeglasses for this reason. As far as I know, it is...
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    50mW green, how worried should I be?

    Ok. My problem is, I have been nervous about my eyes before this, but not because of lasers. One thing I must tell everyone though. Almost every morning I wake up and open my eyes, I see, for a second, a network of black lines extending from the center of my field of vision. The lines persist...
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    50mW green, how worried should I be?

    Hello I got to try out an 50mW green laser, purchased from buywithcoins.com I have read about laser safety and everything, but I wonder if I got over excited. Pointing it downwards at a white wallpaper, it was not too uncomfortable from some 5ft distance. Pointing it under the leaves of a...




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