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Thread: dpss fail modes

  1. #1
    Join Date
    Nov 2014
    Location
    mid michigan
    Posts
    792

    Default dpss fail modes

    Today one of my chinese made laser pointers that is in the 300mw output range now only does about 20 mw, i was monitoring voltage, current and head temp when it failed, it whent to about 110F with a voltage of 3.04 and a current of about 1.5 amps with it's protection device in circuit, i have the unit apart the optics are in aluminum discs screwed and glued into a stack, cosmetically it all looks fine, i put my glasses on and fired it up to find the laser diode easily over-ranges my crappy power meter, the question i have this, could the diode have shifted frequency or failed in some other way that i don't know of?

  2. #2
    Join Date
    Nov 2014
    Location
    mid michigan
    Posts
    792

    Default

    basically
    what i am wondering is, would a new diode fix this?

  3. #3
    Join Date
    Nov 2014
    Location
    mid michigan
    Posts
    792

    Default

    i have a running theory to what may have caused the damage, i was using a buck converter that has a constant current mode but i find some to have insufficient filtering and can have transient voltage spikes that exceed the voltage rating of the diode, when i rebuild the laser i am going to use lasorb devices, when i dismalted the laser it lacked even a basic zener at the laser diode, i even miss it now, to date it was the best green for the basic display it was used in, on plus its a c mount diode so i am hoping i can find one, a 470mn is still outside of my budget

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