Figure 2
Overview of the experimental setup. We have used the following notations: DL PRO: external-cavity diode lasers, HWP: half-wave plate, PBS: polarizing beam splitter, QWP: quarter-wave plate, BS: beam splitter, HR: dielectric mirror, DM: dichroic mirror, SA: spectrum analyzer, RPD: 2-way microwave resistive power divider, SIG: a weak signal generator, LO: local oscillator, BD: balanced detector, PD: photodetector