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In optics, a Gires–Tournois etalon is a transparent plate with two reflecting surfaces, one of which has very high reflectivity. Due to multiple-beam interference, light incident on a Gires–Tournois etalon is (almost) completely reflected, but has an effective phase shift that depends strongly on the wavelength of the light. The complex amplitude reflectivity of a Gires–Tournois etalon is given by : where ''r''1 is the complex amplitude reflectivity of the first surface, : :''n'' is the index of refraction of the plate :''t'' is the thickness of the plate :''θt'' is the angle of refraction the light makes within the plate, and :''λ'' is the wavelength of the light in vacuum. == Nonlinear effective phase shift == Suppose that is real. Then , independent of . This indicates that all the incident energy is reflected and intensity is uniform. However, the multiple reflection causes a nonlinear phase shift . To show this effect, we assume is real and , where is the intensity reflectivity of the first surface. Define the effective phase shift through : One obtains : For ''R'' = 0, no reflection from the first surface and the resultant nonlinear phase shift is equal to the round-trip phase change () – linear response. However, as can be seen, when ''R'' is increased, the nonlinear phase shift gives the nonlinear response to and shows step-like behavior. Gires–Tournois etalon has applications for laser pulse compression and nonlinear Michelson interferometer. Gires–Tournois etalons are closely related to Fabry–Pérot etalons. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gires–Tournois etalon」の詳細全文を読む スポンサード リンク
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