We investigate the total intensity fluctuation spectrum of the two-longitudinal- mode Nd:YVO4microchip laser(ML).We find that low-frequency relaxation oscillation(RO) peaks still appear in the total intensity fluctuat...We investigate the total intensity fluctuation spectrum of the two-longitudinal- mode Nd:YVO4microchip laser(ML).We find that low-frequency relaxation oscillation(RO) peaks still appear in the total intensity fluctuation spectrum, which is different from a previous research result that the low-frequency RO peaks exist in the spectrum of the individual mode but compensate for each other totally in the total intensity fluctuation spectrum. Taking the spatial hole-burning effect into account, one and two-mode rate equations for Nd:YVO4ML laser are established and studied. Based on the theoretical model, we find that when the gains and losses for two longitudinal models are different, a low-frequency RO peak will appear in the total intensity fluctuation spectrum, while when they share the same gain and loss, the total spectrum will behave like that of a single mode laser. Theoretical simulation results coincide with experimental results very well.展开更多
The statistical properties of the energy levels calculated for the doubly-odd nuclei &84Y,^124Cs and ^156Tb within the quasiparticle plus axially spmmetric rotor model are studied by means of the two standard stat...The statistical properties of the energy levels calculated for the doubly-odd nuclei &84Y,^124Cs and ^156Tb within the quasiparticle plus axially spmmetric rotor model are studied by means of the two standard statistical tests of random-matrix theory,i.e.the distribution function p(s) of the nearest-neighbour level spacings and the spectral rigidity (Δ3 statistics).We also investigate the Brody distribution function pB(s) with a single parameter that describes the chaotic degree of the systematic dynamics and the transition behaviour of the spectral fluctuations between Poisson and Gauss orthogonal ensemble limits.展开更多
基金Project supported by the Beijing Higher Education Young Elite Teacher ProjectChina(Grant No.YETP0086)+2 种基金the Tsinghua University Initiative Scientific Research ProgrammeChina(Grant No.2012Z02166)the Special-funded Programme on National Key Scientific Instruments and Equipment Development of China(Grant No.2011YQ04013603)
文摘We investigate the total intensity fluctuation spectrum of the two-longitudinal- mode Nd:YVO4microchip laser(ML).We find that low-frequency relaxation oscillation(RO) peaks still appear in the total intensity fluctuation spectrum, which is different from a previous research result that the low-frequency RO peaks exist in the spectrum of the individual mode but compensate for each other totally in the total intensity fluctuation spectrum. Taking the spatial hole-burning effect into account, one and two-mode rate equations for Nd:YVO4ML laser are established and studied. Based on the theoretical model, we find that when the gains and losses for two longitudinal models are different, a low-frequency RO peak will appear in the total intensity fluctuation spectrum, while when they share the same gain and loss, the total spectrum will behave like that of a single mode laser. Theoretical simulation results coincide with experimental results very well.
文摘The statistical properties of the energy levels calculated for the doubly-odd nuclei &84Y,^124Cs and ^156Tb within the quasiparticle plus axially spmmetric rotor model are studied by means of the two standard statistical tests of random-matrix theory,i.e.the distribution function p(s) of the nearest-neighbour level spacings and the spectral rigidity (Δ3 statistics).We also investigate the Brody distribution function pB(s) with a single parameter that describes the chaotic degree of the systematic dynamics and the transition behaviour of the spectral fluctuations between Poisson and Gauss orthogonal ensemble limits.
