How do lasers produce standing and coherent light waves

[m_the0ry]

I'm no physicist and this question has been baffling me. Wikipedia explains that the light is coherent and standing waveform but doesn't explain why.

I did a few thought experiments contradicting what I know to be true about lasers and the light waves they produce.

For example, the stimulated emission ('SE' part of 'LASER') theoretically happens instantaneously and simultaneously at certain planes within the laser gas. However if we have two gas particles that are stimulated simultaneously that are separated by one half of one wavelength in the direction of propagation of the emitted light, the two waves will be 180 degrees out of phase and completely destruct.

can anyone explain?

[arahant]

lasers use mirrors to reflect the light repeatedly within the unit, so only a single frequency is amplified, while others are eliminated before they leave the laser.

[gumpzilla]

I'm no laser guy, so take this with a considerable grain of salt, but I think ultimately this comes down to photons being bosons, and the phase coherent behavior is essentially just another form of boson condensation.