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Interesting, I have no experience yet, but assumed a laser led would be similar to a standard led, which you can modulate easily, although frankly I've never tried doing it with a modulated constant current. I just set the threshold and combined the audio power to it. So, applying the same...

I think (ha) you are overthinking it. But I could also be remembering things incorrectly. It's late, and my brain is laughing at me. What you are describing is 'sooooo digital'. You won't have to sample the pulse width at an insane frequency... that's too cumbersome and will actually introduce...

So why 1MHZ? That's awfully high, what's the application? If you want to drive the mosfet to saturation you could avoid heat by varying the pulse width instead. I try not to go over 10khz so i can use standard $1 components, but I don't have any specialized size requirements where need super...

Did you find a solution? I may be misunderstanding, but a high power voltage to current amp can be made with 3 components... This circuit will cost you about 2 bucks... and it could easily be fed by a pulsed voltage source (160Khz as you described)... which I can also provide if you like...