TWO-PHOTON CORRELATION MEASUREMENTS OF NON-CLASSICAL LIGHT AND ITS APPLICATIONS OF ULTRAFAST SPECTROSCOPY

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We have invcstigated statistical characters of a squeezed pulse train by two-photon coincidenec counting. We have also measured a pulsc duration of a weak picosccond pulscs by using an interferometer and counting technique. The results are listed below.1. We have performed two-photon coincidence counting measurements of a squeezed pulse train from a parametric amplifier pumped by a continuous-wave mode-locked laser. The intensity correlation function at zcro time dclay can determined by measuring the ratio of two types of the coincidences, the one within the same mode-locked pulse and the one among different pulses. lambda single mode analysis of the intensity correlation function g^<(2)> (O) is made to explain the experimental resuits.2. We have developed a new two-photon interference scheme for measuring the coherence time and pulse width of ultrafast pulses. Experiments have been performed with the output pulses of a cw mode-locked dye laser, with results in good agreement with the conventional second-harmonic autocorrclation mcasurement.