if it is a three pin diode and has the middle pin on the right side
the top pin is + middle is - and bottom controls something that i dont know
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Trail and error is the best way but it depends on the type of laser diode.
. Use a multimeter with a "diode check" function. Many multimeters will do the job on x1 ohms, but there is a slight risk of sending too much current through the diode.