We report laboratory target vibration measurements that use an easily aligned and adjusted fiber-based 1.5-μm heterodyne lidar. The targets are simple spherically curved retroreflectors with well-controlled vibration frequencies and amplitudes. A rotating ground-glass screen creates Gaussian speckle. We wish to understand the modulated and fast-fading lidar returns seen from real targets. We frequency demodulated the recorded laboratory data by phase differencing to provide estimates of dϕ/dt, where ϕ is the phase of the received carrier-plus-noise phasor. Experimental results for signal strength and signal-to-noise ratio, for specific target modulation parameters, agree well with our recently developed dϕ/dt correlation-function theory.
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