Hardy A, Belanger P A, Siegman A E
Weizmann Institute of Science, Electronics Department, Rehovot, Israel.
Appl Opt. 1982 Mar 15;21(6):1122-4. doi: 10.1364/AO.21.001122.
The orthogonality properties of the eigenmodes of general optical resonators which have a phase conjugate mirror at one end are derived. It is shown that essentially these are biorthogonal relations as in conventional resonators, which are satisfied between the set of modes propagating in one direction around the resonator and the adjoint set of modes propagating in the reversed direction.