Laser Components (Hudson, NH) offers the LSP40 plug & play driver module, which can be used to accurately control pulsed laser diodes (PLDs). With two resistors, the user is able to regulate the operating current (and thus the laser power) and the pulse length. It requires an operating voltage of 12 VDC and an external trigger signal. The laser current can be set to any value up to 40A, and the pulse length can be set to between 30ns and 150ns. At a reduced current, pulse lengths up to 1μs are achievable.