Recently physicists have managed to build "attosecond lasers", lasers which emit pulses 10^-18 seconds long, interrupted by much longer periods of darkness (at least 10^-14 seconds). Before them, lasers emitting femtosecond (10^-15 seconds) pulses have been around. Assuming they produce visible light, what colour is it?

One correction.  The taylor approximation starts breaking down for larger n.  So, the spectrum is actually weighted towards the ultraviolet, x-ray, and gamma ray part of the spectrum.

Posted by gregg on 2006-10-19 03:26:20