Nonlinear Mach–Zehnder interferometer with ultrabroadband squeezed lightстатья
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Дата последнего поиска статьи во внешних источниках: 4 марта 2020 г.
Аннотация:We study both theoretically and experimentally the interference pattern in a nonlinearMach–Zehnder interferometer formed by two aperiodically-poled crystals, where broadbandsqueezed light is generated by both crystals via parametric down-conversion with a common quasi-monochromatic pump. This configuration is important for measuring the squeezing produced by thefirst crystal and also for measuring a small phase shift introduced by a sample between the crystals.On the basis of the approximate quantum Rosenbluth formula for each crystal we develop an ana-lytic model for the field evolution in the interferometer. We report an experimental observation ofthe interference fringes, caused by the dispersion of the generated PDC waves in both crystals form-ing the interferometer. We observe a displacement of the interference pattern caused by a samplebetween the crystals and infer the phase shift within a band of 20 nm. The experimental data are in agood agreement with the predictions of the developed model, up to imperfections of the samples