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So the photodiode mostly corrects for temperature drift, correct? If this trend is largely an exponential decay with reasonable lifetime I can just wait until its stable within 1% or something, but a linear drift will affect the measurement I'm trying to make. I'll start with the basic LM317 CC...

How do I account for the monitor photodiode for a basic LM317 constant-current circuit?

I've got a thorlabs L658P040 laser diode that I'd like to turn on. I'm considering 2 options: 1. The simplest possible circuit to drive this LD without blowing it up 2. A cheap off the shelf driver that can be integrated with some microcontroller Any starting points on either of these paths...