Re: Is an omnidirectional laser possible?

On Mar 17, 11:37=A0pm, Igor Khavkine <igor...@xxxxxxxxx> wrote:
=2E..
Actually, no. Whatever the shape of the resonant cavity, the
monopole component of outgoing radiation must be static.

Yes, you correct, of course. Most real lasers, though, are multimode.
It is interesting to think further about whether such a mirror
arrangement would result in a multimode laser which excites several m
and n (phi and theta wave number) modes not equal to zero, but which
results in spherical convergence within the diffraction limit.
Spherical harmonics are separable in r, theta, and phi variables, so
it seems to me that spherical mirrors could still be employed.

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