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首页> 外文会议>Conference on High-Resolution Wavefront Control: Methods, Devices, and Applications IV, Jul 8-9, 2002, Seattle, Washington, USA >A Detector Array For Direct Control of a Deformable Mirror
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A Detector Array For Direct Control of a Deformable Mirror

机译：直接控制可变形反射镜的检测器阵列

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摘要

A wavefront sensing detector array is presented with capabilities suited towards high-order adaptive optics systems. The phase of the wavefront is sensed by modulating and synchronously sampling the fringes of a white light interferogram imaged onto the array. The nature of the modulation is characterized by a voltage signal, which is delivered as an input to the array. As a fringe moves across an individual detector, the null is sensed, triggering a sampling of the modulation signal. The sampled signal represents the phase of the wavefront and is held until the next null is sensed. The signal makes it possible to directly send commands to a deformable mirror to correct the phasefront. This chip is optically mapped such that each pixel in the array corresponds to an actuator on the deformable mirror. The array outputs both the photodetector current and the sampled modulation signal voltage from individual pixels by means of bit parallel row and column inputs. A prototype of this array has been fabricated in a 0.5um CMOS process with 21x21 detectors, suitable for (circular) deformable mirrors with up to 349 actuators. Experimental results suggest refresh rates in excess of 3kHz are attainable. This wavefront sensor could greatly simplify the process of controlling a deformable mirror for many applications, thereby increasing refresh rates and improving sensitivity.
机译：提出了一种波前感测检测器阵列，具有适用于高阶自适应光学系统的功能。通过调制并同步采样成像在阵列上的白光干涉图的条纹，可以检测波前的相位。调制的性质以电压信号为特征，该电压信号作为输入传递到阵列。当条纹在单个检测器上移动时，会检测到零点，从而触发调制信号的采样。采样的信号表示波前的相位，并保持到检测到下一个零点为止。该信号可以直接将命令发送到可变形镜，以校正相前。该芯片被光学映射，使得阵列中的每个像素对应于可变形镜上的致动器。该阵列通过位并行的行和列输入从单个像素输出光电探测器电流和采样的调制信号电压。该阵列的原型已在0.5um CMOS工艺中用21x21探测器制造，适用于具有多达349个致动器的（圆形）可变形反射镜。实验结果表明，刷新率可超过3kHz。这种波前传感器可以大大简化许多应用中控制可变形反射镜的过程，从而提高刷新率并提高灵敏度。

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