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Thread: The BANTHAI BEAST

  1. #31
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    That is some excellent information to know before one starts to lay out the pieces and drill the holes!

    I plan on going solid state, but I have a working system, so I can take my time to put together the best stuff I can find. I'd also like to get stuff from other PL members, even if it costs a bit more. At least I have an idea of where it came from. Like everyone else says... This forum is THE BEST. I love reading stuff here.

    Can you (or have you already) shed some light on your dichro selection, testing and alignment?

    Hang on a second.... I'm reading this whole thread again. I see you have some stuff to say about it....

    Thanks!

    Oh yeah... nice pictures too!

    James.
    Last edited by James Lehman; 07-05-2008 at 11:38.

  2. #32
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    James
    in respect of the dichro angles I have found the same as Karl in that sometimes they do crazy things - like Edmund optics reflect blue dichro pass a HUGE ammount of valuable blue laser light when set at 45 degrees. In fact it reflects blue best when its surface is 90 degrees to the beam! - which obviouly is somewhat limiting when building a projector.
    So Im with Karl - try stuff yourself and let your own inovation take over from what is assumed to be gospel.
    The other one (that I keep banging on about) is placing PBS cubes at an angle
    see here....http://www.photonlexicon.com/forums/...ead.php?t=4693

    Rob
    If you need to ask the question 'whats so good about a laser' - you won't understand the answer.
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  3. #33
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    Hey, this is information this I need too!
    It's only difficult to adjust the best angle if you do not have a power meter.
    Unless the difference in output can be seen with you eye.

  4. #34
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    Quote Originally Posted by MambaFreak View Post
    Hey, this is information this I need too!
    It's only difficult to adjust the best angle if you do not have a power meter.
    Unless the difference in output can be seen with you eye.
    Get yourself an inexpensive solar cell, like a piece of photovoltaic. Put a piece of white (clear) polyethylene packing foam on the surface of it to catch and disperse the laser beam and use a digital volt meter to read its output. It won't tell you anything about absolute power, but you don't need that. You need relative power.

    EDIT NOTICE: !!!
    "white (clear) polyethylene packing foam "
    I have never tried this with a laser of any real power!
    I guess the good new is that you could try a tiny bit of it and see if it burns. PE foam is pure CH4 polymer; (no Cl). Although it does have plasticizers and it is expanded with butane (I think).

    James.
    Last edited by James Lehman; 07-07-2008 at 10:02.

  5. #35
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    James/Audrey
    this idea is much better with an analogue meter - like you say James the actual reading is of no consequence but reading a swinging needle is easier visually than reading a digital sample off a voltmeter. I have a little device I call 'Peaky Meter' its a £2.50 cheap and nasty analogue meter that has a photodiode (as an alternative to a solar cell - either will do the trick) permanently (if a little poorly) attached to the probe inputs. Its great for tweaking the optics on my ion laser or tuning in the NEOS PCAOM and would work a treat in this instance. Build yourself one today Audrey you wont regret it!

    Rob
    If you need to ask the question 'whats so good about a laser' - you won't understand the answer.
    -----------------------------------------------------------------------------------------------
    Laserists do it by the nanometre.

    Stanwax Laser is a Corporate Member of Ilda

    Stanwax Laser main distributor of First Contact in UK - like us on Facebook http://www.facebook.com/FirstContactPolymerCleaner
    www.photoniccleaning.co.uk

  6. #36
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    You can also use a green LED, this has the added benefit of having a diffuser built in however would perform differently for different wavelengths
    P.S. not all green LEDs work, try a few and measure the output on a digital multimeter (unfortunately it needs to be digital as you'll only get millivolts/amp out)
    http://www.sbk-laser.ch/PowerMeter.htm
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  7. #37
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    karl your beast be at the meet???
    Eat Sleep Lase Repeat

  8. #38
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    Quote Originally Posted by loopee View Post
    (unfortunately it needs to be digital as you'll only get millivolts/amp out)
    I reckon you will only get a tiny ammount from a photodiode too but I find it works on 0.5mA range and on the resitance ranges too - these provide the power.

    Rob
    If you need to ask the question 'whats so good about a laser' - you won't understand the answer.
    -----------------------------------------------------------------------------------------------
    Laserists do it by the nanometre.

    Stanwax Laser is a Corporate Member of Ilda

    Stanwax Laser main distributor of First Contact in UK - like us on Facebook http://www.facebook.com/FirstContactPolymerCleaner
    www.photoniccleaning.co.uk

  9. #39
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    andy asked ...
    karl your beast be at the meet???
    hopefully .... yes

    all the best ... Karl

  10. #40
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    look forward to seeing it.

    should be plenty of colour at this meet
    Eat Sleep Lase Repeat

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