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Thread: Using 445 diodes as a PUMP source?

  1. #11
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    I never got full lasing, just stimulated emission. Damn REO not giving me mirrors :O
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  2. #12
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    how about flavine based dyes? (like riboflavin)

    they like blue pumps and fluoresce in the red-orange region

    don't know if they are readily available though

    will try several dyes when I get my diodes... rectangular shape might also be good for transverse pumping like with Nē lasers... why not a flow tube with rows of pumps?

  3. #13
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    Quote Originally Posted by shrad View Post
    why not a flow tube with rows of pumps?
    Dye self terminates due to being a three level system with a long lifetime in the lower excited state.
    You want to be pumping fresh dye as quickly as possible with the old dye given time to decay back to ground state.

    I was wondering about the old standby Rhodomine 6?

    Regards, Dan.

  4. #14
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    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    yeah, but you need 2-3 watts in a small focal spot to threshold most visible dyes. IR dyes go at a much lower threshold, and lower flows. But every flowing dye I've ever seen had a 30-100 psi dye pump for the jet. The 300 nanosecond triplett state comes back to haunt you. Yet even a hene can pump a IR dye. Makes one wonder how well one of these would work hooked to a 50 ohm pulse generator, but probably a massive pulse.

    Probably more likely to get something like alexandrite or nd:yag to go, or a vapor such as iodine or sodium or calcium.

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  5. #15
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    I'm reviving this old thread

    I found this document online : http://jcpr.kbs-lab.co.kr/english/jo...m4/256-260.pdf

    Read the whole, particularly the end which sounds promising in terms of blue-region pumping of Nd+ doped hosts to produce green and/or red

    Also interesting for people wanting to grow their own crystals with simple chemicals...

  6. #16
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    Laser Warning Ultrafast

    One of these 1 Watt 445 nm diodes has been used to pump a Ti:Sapphire Ultrafast laser giving 19 mW @ 800 nm with 113 fS pulses. The researchers say with 2 diodes they may beable to make a tunable 50 mW ultrafast laser. I see no reason they can't be used to pump Ti:sapphire and then that doubled to blue. Cook. Phil 142laser
    Phil Bergeron( AKA 142laser)

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