14nm duration? We don't usually quote pulse duration as a distance. I assume you mean a pulse that occurs during the time it would travel 14nm. Using 300 000 m/s, that pulse would be 14 e-12 divided by 3e5. Pulse duration for 14nm would have a duration of 4.67e-17 seconds. In any case, that would be impossible to generate with ordinary electronics.from what i've researched, i am looking to use a ir. anyone recommend where to get a class 1 ir with approx specs , +/- 870nm wavelength and 14nm pulse duration??