Heterodyne laser interferometric techniques based on Fresnel diffraction
Heterodyne laser interferometric techniques based on Fresnel diffraction of laser light on travelling ultrasonic waves are examined. It is shown that with acousto-optical modulation, optical spatial-temporal structures appear in the Fresnel diffraction zone that are periodic in the directions of both the sound and the light. The principles for constructing laser heterodyne interference measurement systems able to measure the position of the boundary of objects moving at velocities as high as several hundreds of meters per minute with a readout resolution of up to 0.01 μm are discussed.
Keywordslaser heterodyne and acousto-optical methods phase frequency converter
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