TOLERANCE OF DUAL, RECYCLING LASER INTERFEROMETRIC GRAVITATIONAL-WAVEDETECTORS TO MIRROR TILT AND CURVATURE ERRORS

Various configurations of dual recycling laser interferometers are tes ted, numerically, for their tolerance to wave-front distortions induce d by mirror tilts and curvature mismatch. We verify that, in the prese nce of such geometric imperfections, dual recycling designs experience significantly less power loss than straight power recycling devices. Importantly, we show that the power loss reduction from the detection port is accompanied by maintenance of circulating-power in the instrum ent and hence maintenance of signal response. We confirm predictions t hat when a cavity is placed at the output port of the interferometer, tolerance to geometric imperfections is further improved by typically an order of magnitude.