Three-port beam splitters-combiners for interferometer applications.
We derive generic phase and amplitude coupling relations for beam splitters-combiners that couple a single port with three output ports or input ports, respectively. We apply the coupling relations to a reflection grating that serves as a coupler to a single-ended Fabry-Perot ring cavity. In the impedance-matched case such an interferometer can act as an all-reflective ring mode cleaner. It is further shown that in the highly undercoupled case almost complete separation of carrier power and phase signal from a cavity strain can be achieved.
Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Universität Hannover, Callinstrasse 38, 30167 Hannover, Germany. roman.schnabel@aei.mpg.de
R
R
Schnabel
A
A
Bunkowski
O
O
Burmeister
K
K
Danzmann