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Objective of the Experiment Grasp the concepts of transverse and longitudinal modes in lasers. Learn to use the cat's eye coupler to observe laser transverse modes. Learn to use a scanning interferometer to observe laser longitudinal modes, and master the calculation of longitudinal mode spacing. Experimental Content Learn to adjust the transverse mode of the output laser by using a cat's-eye sleeve with a semi-external cavity HeNe laser and observe through a light screen. Learn to observe the output laser's longitudinal modes through an oscilloscope using an interferometer, and master the calculation of the longitudinal mode spacing.
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