A Research For Reconstruction Arithmetic Of Self-referencing Wave-front Sensor

Now, large scale wave-front sensor is required as the adaptive opticsdevelopment. The self-referencing wave-front sensor is researched in thispaper, which is based on Phase-Shift interferometer principle. The Wave-frontis reconstructed by interferometric images. Each pixel of CCD camera iscorrespond to a part of the wave-front detected by the wave-front sensor.After phase shift, the part of wave-front can be reconstructed by theinterferometric images. Compared with Shack-Hartmann wave-front sensor inlarge scale wave-front sensing condition, self-referencing wave-front sensorcan increase spatial revolution and decrease the requirement of the quantity ofpixels of CCD cameras. Phase shift technique has the best precision ininterferometer measurements, whose uncertainty is lower than λ/50. Itprovides the theory ground of the self-referencing wave-front sensor based onMach-Zehnder interferometer in high precision measurement.In this paper, the principle and wave-front reconstruction arithmetic ofthe self-referencing wave-front sensor based on Mach-Zehnder interferometeris present. The detection ability of the self-referencing wave-front sensor base on Mach-Zehnder interferometer is studied. The simulation and experimentare done, which are useful for application of self-referencing wave-frontsensor in adaptive optics in future.Simulation is meanly concentrate on the pinhole filter. In ideal condition,referencing wave-front is standard plan wave-front, it gets good results, whichdisplay the advantage of the phase shift interferometer technique. In practicalcondition, referencing wave-front is produced by pinhole filter. Simulation ofthis condition is based on Fourier optics theory. Wave-front is calculated toproduce different distribute of spectrum plan. The simulation results show thatin certain Zernike aberration, pinhole filter is not very good equipment toproduce plan wave-front. The simulation results are useful for self-referencingwave-front sensor development in future.In practical experiment, a static aberration is set to test the detectionability of the self-referecing wave-front sensor. The results, compared withVeeco interferometer, show that the difference between P-V and RMS areboth lower than λ/20. The experiment results show this kind of wave-frontsensor can achieve good accuracy.