KEYWORDS: Sensors, Wavefront sensors, Calibration, Signal to noise ratio, Interferometers, Modulation, Wavefronts, Phase measurement, Shearing interferometers, Control systems
A compact, low-cost wavefront sensor has been demonstrated to measure dynamic disturbances in 1-3 m diameter optical systems. With 448 subapertures and 4 KHz frame rate, it can measure disturbances up to 2 KHz at a level of 1/3800 waves rms at 0.65 μm. It also has a linear dynamic range of 3 X 106:1 for ease of alignment. The principles of operation and test data are presented for the subaperture sensors (called NanoTrackers), which are lateral shearing interferometers capable of measuring tilt to 1.7 nanoradians rms at 8 µW of input power as well as phasing for segmented optical systems to 75 picometers rms (at 4 KHz).
A new active imaging technique is described which eliminates atmospheric distortion and can give diffraction limited performance without any focusing optics. It has been demonstrated in computer simulations and laboratory experiments.
Conference Committee Involvement (3)
Acquisition, Tracking, Pointing, and Laser Systems Technologies XXVI
23 April 2012 | Baltimore, Maryland, United States
Unconventional Imaging III
26 August 2007 | San Diego, California, United States
Unconventional Imaging
31 July 2005 | San Diego, California, United States
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