The direct measurement of the Mandel para- meter of weak laser pulses, with 10 ns pulse duration time and the mean number of photon per pulsenbeing approxi-mately 0.1, is investigated by recording every photocount eve...The direct measurement of the Mandel para- meter of weak laser pulses, with 10 ns pulse duration time and the mean number of photon per pulsenbeing approxi-mately 0.1, is investigated by recording every photocount event. With the Hanbury Brown and Twiss detection scheme, and not more than one photon per pulse being detected dur-ing the sample time by single-photon counters, we have found that the single mode diode laser with driving current lower than the threshold yields a sub-Poissonian statistics. In addition, when the diode laser driving current is much higher than the threshold, it is validated that the Mandel parameter QC of the Poissonian coherent state is nearly -/2.nThe experimental results are in good agreement with theoretical prediction considering the measurement error.展开更多
Using the quantum electrodynamical theory the photon statistics has been established for a single-mode laser. A general master equation is advanced and, on the basis of the steadystate photon-number distribution, the ...Using the quantum electrodynamical theory the photon statistics has been established for a single-mode laser. A general master equation is advanced and, on the basis of the steadystate photon-number distribution, the variation of the Mandel factor with the relative pumping parameter is calculated. Our results show thai photon statistics for a single-mode laser have a novel feature, i.e. the photon-number distribution alternates, in general, between superPoisson distribution and sub-Poisson distribution, and approaches the usual Poisson distribution when the pumping parameter tends to infinite. The dependence of photon statistics on detuning, coupling coefficient, absorption coefficient, thermal mean photon-number and coupling time is discussed.展开更多
文摘The direct measurement of the Mandel para- meter of weak laser pulses, with 10 ns pulse duration time and the mean number of photon per pulsenbeing approxi-mately 0.1, is investigated by recording every photocount event. With the Hanbury Brown and Twiss detection scheme, and not more than one photon per pulse being detected dur-ing the sample time by single-photon counters, we have found that the single mode diode laser with driving current lower than the threshold yields a sub-Poissonian statistics. In addition, when the diode laser driving current is much higher than the threshold, it is validated that the Mandel parameter QC of the Poissonian coherent state is nearly -/2.nThe experimental results are in good agreement with theoretical prediction considering the measurement error.
文摘Using the quantum electrodynamical theory the photon statistics has been established for a single-mode laser. A general master equation is advanced and, on the basis of the steadystate photon-number distribution, the variation of the Mandel factor with the relative pumping parameter is calculated. Our results show thai photon statistics for a single-mode laser have a novel feature, i.e. the photon-number distribution alternates, in general, between superPoisson distribution and sub-Poisson distribution, and approaches the usual Poisson distribution when the pumping parameter tends to infinite. The dependence of photon statistics on detuning, coupling coefficient, absorption coefficient, thermal mean photon-number and coupling time is discussed.
