High frame-rate phase camera for high-resolution wavefront sensing in gravitational-wave detectors

We present a novel way of wavefront sensing using commercially available, continuous-wave time-of-flight camera with QVGA-resolution. This CMOS phase is capable externally modulated light sources frequencies up to 100 MHz. The high-spatial-resolution the sensor, combined our integrated control electronics, allows image power modulation index as low -62 dBc/second/pixel. applicable problems where alignment and mode-mismatch needed suited for diagnostic applications in gravitational-wave detectors. Specifically, we explore use beat signals due thermal distortions from point-like heat absorbers on test masses Advanced LIGO optical path greater than about two nanometers input mirrors, limited by resolution. In homodyne readout, performance can reach 0.1 nm, amplitude sensitivity.