Based on the interference between one-photon and two-photon processes,we report polarization beats in a cascade three-level system(PBCTS).We performed PBCTS experiments in Na vapor,which showed a modulation of the fou...Based on the interference between one-photon and two-photon processes,we report polarization beats in a cascade three-level system(PBCTS).We performed PBCTS experiments in Na vapor,which showed a modulation of the four-wave mixing signal intensity with period 55fs,corresponding to the beating between the resonant frequencies of the transitions from 3S_(1/2) to 3P_(3/2) and from 3P_(3/2) to 4D_(3/2,5/2).展开更多
We have observed beating between two broadband light sources of linewidths 4.3 and 2.3nm by a method of time-delayed laser-induced double gratings.We explain the signal modulation by relating the signal intensity to t...We have observed beating between two broadband light sources of linewidths 4.3 and 2.3nm by a method of time-delayed laser-induced double gratings.We explain the signal modulation by relating the signal intensity to the autocorrelation function of a field which consists of two frequency components.展开更多
We have studied theoretically a time-delayed laser-induced double gratings(TDLIDG)in a Doppler-broadened three-level system.We have shown that the overall accuracy of using TDLIDG for the energy-level splitting measur...We have studied theoretically a time-delayed laser-induced double gratings(TDLIDG)in a Doppler-broadened three-level system.We have shown that the overall accuracy of using TDLIDG for the energy-level splitting measurement is determined by the homogeneous linewidths of the optical transitions.展开更多
We report,for the first time an experiment of the tiine-deltiyed Ra.nia.n-enhanced nondegenerate four-wave-mixing(RENFWM)with incoherence light in carbon disulfide.We studied the RENFWM signal intensity as a/unction o...We report,for the first time an experiment of the tiine-deltiyed Ra.nia.n-enhanced nondegenerate four-wave-mixing(RENFWM)with incoherence light in carbon disulfide.We studied the RENFWM signal intensity as a/unction of the relative time delay r between two beams which originate from a single broadband laser source.Our results indicate that the temportil behavior of the BENFWM is asymmetric with the mux-imiim of the signal shifted from r=0.From our experimental results the relaxation time of the Kanian mode ca.ii be extracted directly.展开更多
Optical bistability hysteresis loop has been observed experimentally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The obse...Optical bistability hysteresis loop has been observed experimentally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.展开更多
Optical bistability hysteresis loop has been observed experiment ally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The obs...Optical bistability hysteresis loop has been observed experiment ally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.展开更多
The first observation of collisional narrowing by time-resolved degenerate four-wave mixing has been reported. The velocity-changing collision cross section of Na in Ar De obtained is 5.6 × 10^(-15)cm^(2).
Dephasing time T_(2) of ruby in the absorption band ^(4)T_(2) has been measured for the first time using the method of transient grating with incoherent light.The population grating was induced in the material by two ...Dephasing time T_(2) of ruby in the absorption band ^(4)T_(2) has been measured for the first time using the method of transient grating with incoherent light.The population grating was induced in the material by two broad-band nanosecond pulses of a dye laser and probed by a Continuous Wave(CW)Ar^(+) laser.A t room temperature,T_(2)=0.04~0.08 ps was obtained when the sample was excited at λ=5640Å.展开更多
基金Supported by the National Natural Science Foundation of Chinathe Climbing Program from Cliinese Commission of Science and Technology.
文摘Based on the interference between one-photon and two-photon processes,we report polarization beats in a cascade three-level system(PBCTS).We performed PBCTS experiments in Na vapor,which showed a modulation of the four-wave mixing signal intensity with period 55fs,corresponding to the beating between the resonant frequencies of the transitions from 3S_(1/2) to 3P_(3/2) and from 3P_(3/2) to 4D_(3/2,5/2).
基金Supported by the National Natural Science Foundation of Chinathe Femtosecond Technique&Ultrafast Phenomena Project of Chinathe Chinese Academy of Sciences.
文摘We have observed beating between two broadband light sources of linewidths 4.3 and 2.3nm by a method of time-delayed laser-induced double gratings.We explain the signal modulation by relating the signal intensity to the autocorrelation function of a field which consists of two frequency components.
基金Supported by the National Natural Science Foundation of Chinathe Femtosecond Technique&Ultrafast Phenomena Project of China and the Chinese Academy of Science.
文摘We have studied theoretically a time-delayed laser-induced double gratings(TDLIDG)in a Doppler-broadened three-level system.We have shown that the overall accuracy of using TDLIDG for the energy-level splitting measurement is determined by the homogeneous linewidths of the optical transitions.
基金Supported by tlie National Natural Science Foundation of Chinathe Chinese Academy of Sciences.
文摘We report,for the first time an experiment of the tiine-deltiyed Ra.nia.n-enhanced nondegenerate four-wave-mixing(RENFWM)with incoherence light in carbon disulfide.We studied the RENFWM signal intensity as a/unction of the relative time delay r between two beams which originate from a single broadband laser source.Our results indicate that the temportil behavior of the BENFWM is asymmetric with the mux-imiim of the signal shifted from r=0.From our experimental results the relaxation time of the Kanian mode ca.ii be extracted directly.
基金Supported by the National Natural Science Foundation of China。
文摘Optical bistability hysteresis loop has been observed experimentally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.
基金Supported by the National Natural Science Foundation of China。
文摘Optical bistability hysteresis loop has been observed experiment ally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.
文摘The first observation of collisional narrowing by time-resolved degenerate four-wave mixing has been reported. The velocity-changing collision cross section of Na in Ar De obtained is 5.6 × 10^(-15)cm^(2).
文摘Dephasing time T_(2) of ruby in the absorption band ^(4)T_(2) has been measured for the first time using the method of transient grating with incoherent light.The population grating was induced in the material by two broad-band nanosecond pulses of a dye laser and probed by a Continuous Wave(CW)Ar^(+) laser.A t room temperature,T_(2)=0.04~0.08 ps was obtained when the sample was excited at λ=5640Å.
