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Thread: lowest useful output power?

  1. #21
    Join Date
    Dec 2008
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    Canada
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    As I posted on another 445nm Thread on PL...
    I tested an A130 and an A140 LD and they both
    started lasing at between 210mA to 220mA at ~7mW..


    Jerry
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  2. #22
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    Jan 2009
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    Hannover, Germany
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    @CrazyMonkey:

    Yes a PID regulation with feedback, like you could use to linearize dpss mudulation.
    Would solve the temperature drift problem, but trcky to build, especially small enough.

  3. #23
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    Jun 2009
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    Texas, USA
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    Would you really need PID? Its not mechanical or a thermal system or anything.
    The input and output are fairly linear, and the response should be near instantaneous.
    I was thinking about something simple, like a simple op-amp comparator.
    -- But I like the way you think!

  4. #24
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    And this all in a NewWish host?

  5. #25
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    Jan 2009
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    Ok, any one who tested / could test the real, lowest, usefull power?

    with usefull i mean, a setting which not changes dangerously with temperature. so it could be used from cold night to hot summer day.
    and yes without tec as we want them in pointers...

  6. #26
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
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    just put a nd filter on the output or a polarizer then 10mw becomes 1mw so a safe 50mw would be 5mw. very little heating at that power level. should be rather stable. also put a current limiting resistor in line to stop some fool from removing the filter and upping the current. also design the driver so if it sees more current is shuts down to the same level as referenced from saya zener. That will give them quite a headache to deal with and make it not owrht the while to mess with it.

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