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Schematic diagram of the HLFI. M3: feedback mirror; WP: λ/8 wave plate; M1, M2: cavity mirrors; R: resistance coil; W: Wollaston prism; D1, D2: photo detectors.
High-pass intensities I f and I s when the feedback mirror M3 is scanned by the PZT.
Principle of subdivision. (a) Fivefold resistance chain subdivision and (b) fourfold logic subdivision.
Null drift of the HLFI (a) without and (b) with the PZT scanning technique. The test periods are (a) 20 min and (b) 2 h.
Comparison of displacement measurements between the HLFI and a conventional interferometer (Agilent 5529A). The movable stage is (a) 200 mm and (b) 1000 mm away from M1. The solid curves are linear fits of the experimental data.
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