Common Hartmann wavefront sensor bases on planar reference wave which prevent it measure the aberration of spherical wave directly. When adjusting an optical system with a Hartmann wavefront sensor, the optical path should be collimated firstly. It will make the measurement more complicated and may bring new aberration. To solve the problem, a Hartmann wavefront sensor which bases on spherical reference wave is proposed. In this paper, we analyze the principles of the Hartmann wavefront sensor and verify its feasibility by numerical simulation. The simulation result shows that, on the condition of RMS=1λ(λ=0.6328μm), the relative RMS of the residual error of the reconstructed wavefront is under 8% when the detected wavefront is the 2~15th order Zernike aberration.
The optical axis dynamic range and detection sensitivity are limited by the focal length of the image lens. The focus gets used to be lengthened for enhancing the detection sensitivity, but the dynamic range will become narrow. In this paper, we proposed a new optical path structure on the basis of a two-dimension orthogonal diffraction grating. A corresponding experimental setup was built to compare the dynamic range and centroid detection accuracy of the new method and the conventional method under the same experiment conditions. The experimental results show that the optical axis dynamic range is enlarged obviously, and the high-precision centroid is detected at the same time.
This paper describes High Voltage Driver (HVD) development for Piezoelectric Fast Steering Mirror (PFSM). Piezoelectric actuator's highly capacitive nature and its influence on high voltage driver are discussed. Since the PFSM tends toward higher speed and larger angle, a multi-paralleling power booster output stage linear high voltage amplifier is described that can output significantly higher current than single output stage linear power amplifier. Test results are presented for a fast high voltage driver that can drive a 300mm diameter PFSM (2.5μF piezoelectric actuator) at 100Hz 1000Vpp, also at 5000Hz 20Vpp.
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