Wavefront Distortion Measurement of a Sr Extraction Mirror for the Beam Profile Monitor Using Shack- Hartmann Method
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چکیده
The wavefront measurement technique using the Shack Hartmann wavefront sensor has been developed for measurement of wavefront distortion of a SR extraction mirror for the beam profile monitor at Photon Factory. The instrument consists of a multi-lens array ( 8x8 array, 250 mm pitch and focal length of 4.5 mm), a beam expander (20:1), an image relay lens system (1:1), a HeNe laser (633 nm) and a digital CCD camera. To analyze positions of focal spot on the CCD in 1/10 of the pixel size, the wave front sensor can measured to be l/30. A dynamic range of the wavefront sensor was designed 12.6 mm max. Performance of the wavefront sensor was tested with an optical flat. With this wavefront sensor, a wavefront error caused by surface deformation of the SR extraction mirror was measured at Beamline 27 of Photon Factory. The correction of the measured wavefront distortion is also described.
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تاریخ انتشار 1998