Advanced phasemeter for deep phase modulation interferometry.
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abstract
We present the development of an advanced phasemeter for the deep phase modulation interferometry technique. This technique aims for precise length measurements with a high dynamic range using little optical hardware. The advanced phasemeter uses fast ADCs and an FPGA to implement a design of multiple single-bin Fourier transforms running at high sampling rates. Non-linear noise sources in the design were analyzed and suppressed. A null measurement with an optical beatnote signal using = 1064nm was conducted. It showed a sensitivity of 0.8rad/Hz below 10Hz and 13.3rad/Hz above, with a large dynamic range. The shown performance could enable the measuring of optical path lengths with sensitivities down to 0.14pm/Hz and 2.3pm/Hz, respectively, over several fringes in an interferometric setup.