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Ultrashort colour (Posted on 2006-10-06) Difficulty: 4 of 5

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?

See The Solution Submitted by vswitchs    
Rating: 3.7500 (4 votes)

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re(3): I see - I think | Comment 6 of 14 |
(In reply to re(2): I see - I think by gregg)

I had the same thought as gregg, in that a laser generally emits light of a certain wavelength.  So that should be the wavelength that determines the color.  But what is not clear to me is what color is the light if only a fraction of a wavelength is emitted?

Also, no one has responded to my "half square" comment:  if the burst of light in ON long enough for light to travel 300 nm, then does this correspond to a wavelength of 300 nm or 600 nm?  I say 600 nm which is actually ORANGE (I previously said red, from memory).

  Posted by Larry on 2006-10-12 20:49:55

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