A method for precise measurement of laser wavelength
A technology of precise measurement and laser wavelength, applied in optical radiation measurement, measurement device, measurement optics, etc., to simplify the measurement system structure, avoid mechanical disturbance and environmental disturbance, and achieve the effect of mass manufacturing
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[0024] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.
[0025] figure 1 The working principle of the device shown: continuous wave laser 1 emits a laser beam, which is focused by a Fresnel zone plate 2 with a large numerical aperture, and then the on-axis light is filtered by a pinhole 3, and the light field passing through the pinhole 3 is detected by a photodetector 4 for intensity detection, the pinhole 3 and the photodetector 4 form a point detector, use the one-dimensional piezoelectric ceramic nanometer displacement table 5 to uniformly step and scan the point detector along the axis, measure the focused axial intensity point spread function, use the centroid The focal length is determined by the method, and the linear measurement curve is obtained by using the linear least square fitting method through the focal length-wavelength correspondence relationship, and the precise measurement of the ...
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