Making a laser not a laser

[morgsboi]

A laser is a device that emits light (electromagnetic radiation) through a process of optical amplification based on the stimulated emission of photons. (Wikipedia)

Now a laser produces and emits a beam of light where all waves are in phase with each other and have the same frequency.

If you shine a laser (keeping it still) at a moving object then it changes the frequency of the laser beam.

 

So if you shine a laser at an angle with half of the beam on the moving object and the other half just continuing further would the brief split-second that the object is moving and part of the laser is on and part of it off, would that change the frequency of some of the waves causing the laser to act differently and not be a laser?

 

If you don't understand ask me, and if this needs to be moved to speculations (not sure) then please could you do it yourself as I don't know how. Thank you.

 

[mathematic]

The laser is transmitting coherent photons. What happens later doesn't affect what comes out of the laser.

[morgsboi]

The laser is transmitting coherent photons. What happens later doesn't affect what comes out of the laser.

 

But wouldn't it still change the frequency.

[mooeypoo]

Yes.

 

Almost any interaction with the beam will decrease its energy. Energy is related to the frequency ([math]E=hf[/math], where E is energy, h is planck's constant, and f is the frequency) so that would decrease the frequency. But you have "lower frequency" lasers. Laser beams depend on coherence, not on frequency.

 

Here's a good place to start on that: http://en.wikipedia.org/wiki/Laser and http://www.antonine-...el_of_light.htm