Four-wave mixing (FWM) is a well-known technique to achieve all-optical control wavelength conversion. We propose a well-designed silicon nano-waveguide based on silicon-on-insulator (SOI) to achieve FWM conversion. Particularly, the original signal light continuously sweeps along the C band, and the generated idler light is correspondingly sweeping as the original signal is swept. The wavelengths of the idler and signal lights are symmetric with respect to the pump light wavelength. Simulation and experimental results of the FWM conversion properties are well-matched. With the pump light filtered out, a dual-frequency continuously sweeping laser source is achieved, which could be applied in dual-frequency scanning interferometry to eliminate dynamic errors in practical use.
We present a novel coordinate measurement system based on a combination of frequency scanning interferometry and multilateration. The system comprises a number of sensors (minimum of four) that surround the measurement volume. Spherical glass retro-reflectors act as targets that are used to define the points in space to be measured. The sensors all measure the absolute distance to all targets simultaneously. The resulting distances are then used to compute the coordinates of the targets and other systematic parameters such as the sensor locations. Initial experimental comparison with a commercial laser tracker has shown that the proposed system is capable of achieving coordinate uncertainties of the order of 40 μm in a measurement volume of 10 m × 5 m × 2.5 m. The system is self-calibrating, inherently traceable to the international system of units (the SI) and computes rigorous coordinate uncertainty estimates.
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