Abstract
This paper proposes an optical amplification method of measuring the minute displacement of a laser beam. The relationship between the displacement of the incident laser beam and the reflective beam is calculated by geometric optical analysis. The equation of displacement is derived to calculate its magnification. We demonstrate that by employing the reflection characteristics of a cylindrical mirror, the minute-displacement of a laser beam can be enlarged to the millimetre level. Experimental results confirm that the magnification can be hundreds of times. Such an enlarged displacement measuring system of laser beam could be suitable for the study of Goos–Hänchen shift.
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