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A scanning Fabry-Perot etalon to be used in studying mode structure of a He-Ne laser with...

A scanning Fabry-Perot etalon to be used in studying mode structure of a He-Ne laser with the following characteristics: llaser = 110 cm, spacing between longitudinal modes is 1.7x109 Hz, and the full width half maximum is 1.7x107 Hz. What will be the length, finesse, and mirror reflectivity of the resonator? Assume that both mirrors have same reflectivity.

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