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Interference effects in spontaneous two-photon parametric scattering from two macroscopic regions

1997; American Physical Society; Volume: 56; Issue: 4 Linguagem: Inglês

10.1103/physreva.56.3214

1538-4446

A. V. Burlakov, Maria V. Chekhova, D. N. Klyshko, S. P. Kulik, A. N. Penin, Yanhua Shih, Dmitry Strekalov,

Random lasers and scattering media

Two types of interference were observed using two-photon spontaneous parametric radiation from two nonlinear interaction regions. Two experimental setups analogous to the Young and Mach-Zehnder interferometers were used. An interesting feature of the two-photon Young interference is the opposite conditions for its observation by two different methods: by measuring intensity of light at a single frequency and by measuring correlation of intensities at two conjugated frequencies (method of coincidences). Two-photon Mach-Zehnder interference resembles the Ramsey method of separated fields, which is used in beam spectroscopy. A simple macroscopic quantum model agrees well with the experimental results and enables their interpretation in terms of ``biphotons'' carrying information about the pump phase.