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A Simple Method for Determining Focal Distances Using Talbot Self-Images
Oliver Spires,이석목,Jose Sasian 한국광학회 2015 Current Optics and Photonics Vol.19 No.6
We present a simple method to determine the focal distances of lenses with the Talbot self-images. This method uses only one grating, and a priori knowledge of the period of the grating is replaced witha linear relation between the (de)magnified periods of the Talbot images and the lens-to-grating distance. A thick lens whose effective focal length is 500 mm was used to validate the method, and the focal distanceof the converging beam was determined with the difference of 0.15% for the nominal focal distance of521.9 mm. The determined period of the grating with the difference of 0.2% also supports the validation