Femtosecond coherent anti-Stokes Raman scattering(CARS) suffers from poor selectivity between neighbouring Raman levels due to the large bandwidth of the femtosecond pulses.This paper provides a new method to realize ...Femtosecond coherent anti-Stokes Raman scattering(CARS) suffers from poor selectivity between neighbouring Raman levels due to the large bandwidth of the femtosecond pulses.This paper provides a new method to realize the selective excitation and suppression of femtosecond CARS by manipulating both the probe and pump(or Stokes) spectra.These theoretical results indicate that the CARS signals between neighbouring Raman levels are differentiated from their indistinguishable femtosecond CARS spectra by tailoring the probe spectrum,and then their selective excitation and suppression can be realized by supplementally manipulating the pump(or Stokes) spectrum with the π spectral phase step.展开更多
Multiple order self-diffractions by femtosecond laser-induced transient grating in CeO2 doped 75TeO2-20Nb2O5-5ZnO glass are investigated by pump-probe technique. The glass structure and component are investigated by R...Multiple order self-diffractions by femtosecond laser-induced transient grating in CeO2 doped 75TeO2-20Nb2O5-5ZnO glass are investigated by pump-probe technique. The glass structure and component are investigated by Raman and visible--NIR absorption spectra. It is showed that there exists Ce^3+ ion in tellurite glass, and the transient grating is created by the optical Kerr effects and improved by the excited particle grating from the resonant absorption of the ^1S0→^1F3 electronic energy transition of Ce^3+ ion, and the conversion efficiency of the first order diffraction signal reaches about 11%. The results indicate that CeO2 doped 75TEO2 20Nb2O5-5ZnO glass has potential applications in ultra-fast all-optical switching.展开更多
Nonlinear optical properties of 75TeO2-20Nb2O5-5ZnO glasses doped with CeO2 have been investigated with a self-diffracted time-resolved degenerate four-wave mixing (DFWM) technique at different excitation intensities ...Nonlinear optical properties of 75TeO2-20Nb2O5-5ZnO glasses doped with CeO2 have been investigated with a self-diffracted time-resolved degenerate four-wave mixing (DFWM) technique at different excitation intensities and lattice temperatures. The DFWM signal exhibits three peaks at higher excitation intensities, where a main peak appears at zero delay time and two rather weak side peaks are located symmetrically at the negative and positive time delay.Due to destructive interferences between the fifth- and third-order polarizations, the line-shape of the main peak around the zero time delay evolves from single peak into a double-peak structure with increasing excitation intensity. Two side peaks emerge at the positive and negative time delay and gradually intensify with increasing excitation intensity or lattice temperature, and their positions are independent of the pulse duration, temperature and excitation intensity,which are attributed to the many-body Coulomb interaction.展开更多
基金Supported by National Natural Science Foundation of China(11474096,11604199,11747101)Natural Science Foundation of Henan Province(182102210117,17A140025,16A140030)Science and Technology Commission of Shanghai Municipality(14JC1401500)~~
基金Project supported by Programme for Changjiang Scholars and Innovative Research Team in University(PCSIRT)Shanghai Leading Academic Discipline Project(Grant No.B408)+3 种基金National Key Project for Basic Research of China(Grant Nos.2006CB806006 and 2006CB921105)Ministry of Education of China(Grant No.30800)Shanghai Municipal Natural Science Foundation(Grant No.09ZR1409300)Shanghai Municipal Science and Technology Commission(Grant No.07DZ22025)
文摘Femtosecond coherent anti-Stokes Raman scattering(CARS) suffers from poor selectivity between neighbouring Raman levels due to the large bandwidth of the femtosecond pulses.This paper provides a new method to realize the selective excitation and suppression of femtosecond CARS by manipulating both the probe and pump(or Stokes) spectra.These theoretical results indicate that the CARS signals between neighbouring Raman levels are differentiated from their indistinguishable femtosecond CARS spectra by tailoring the probe spectrum,and then their selective excitation and suppression can be realized by supplementally manipulating the pump(or Stokes) spectrum with the π spectral phase step.
文摘Multiple order self-diffractions by femtosecond laser-induced transient grating in CeO2 doped 75TeO2-20Nb2O5-5ZnO glass are investigated by pump-probe technique. The glass structure and component are investigated by Raman and visible--NIR absorption spectra. It is showed that there exists Ce^3+ ion in tellurite glass, and the transient grating is created by the optical Kerr effects and improved by the excited particle grating from the resonant absorption of the ^1S0→^1F3 electronic energy transition of Ce^3+ ion, and the conversion efficiency of the first order diffraction signal reaches about 11%. The results indicate that CeO2 doped 75TEO2 20Nb2O5-5ZnO glass has potential applications in ultra-fast all-optical switching.
文摘Nonlinear optical properties of 75TeO2-20Nb2O5-5ZnO glasses doped with CeO2 have been investigated with a self-diffracted time-resolved degenerate four-wave mixing (DFWM) technique at different excitation intensities and lattice temperatures. The DFWM signal exhibits three peaks at higher excitation intensities, where a main peak appears at zero delay time and two rather weak side peaks are located symmetrically at the negative and positive time delay.Due to destructive interferences between the fifth- and third-order polarizations, the line-shape of the main peak around the zero time delay evolves from single peak into a double-peak structure with increasing excitation intensity. Two side peaks emerge at the positive and negative time delay and gradually intensify with increasing excitation intensity or lattice temperature, and their positions are independent of the pulse duration, temperature and excitation intensity,which are attributed to the many-body Coulomb interaction.
基金Supported by the National Natural Science Foundation of China under Grant No 10574046, the National Basic Research Programme of China under Grant Nos 2006CB806006 and 2006CB921105, the Programme for Changjiang Scholars and Innovative Research Team in University （PCSIRT）, the Doctoral Programme of High Education under Grant No 20050269011, the Phosphor Programme of Shanghai Science and Technology Committee under Grant Nos 07dz22025, 06QH14003 and 06PJ14035.
基金Supported by the National Natural Science Foundation of China under Grant No 10574046, the National Basic Research Programme of China under Grant Nos 2006CB806006 and 2006CB921105, the Programme for Changjiang Scholars and Innovative Research Team in University （PCSIRT）, the Programme for New Century Excellent Talents in University （NCET-04-0420）, the Doctoral Programme of High Education （No 20050269011）, the Phosphor Programme of Shanghai Science and Technology Committee （No 06QH14003）, and the Shanghai Pujiang Programme （No 06PJ14035）.
基金Supported by the Programme for Changjiang Scholars and Innovative Research Team in University （PCSIRT）, Shanghai Leading Academic Discipline Project （B408）, the National Natural Science Foundation of China under Grant No 10574046, the National Basic Research Programme of China under Grant Nos 2006CB806006 and 2006CB921105, the Programme for New Century Excellent Talents in University （NCET-04-0420）, the Doctoral Programme of High Education （No 20050269011）, Phosphor Programme Sponsored by Shanghai Science and Technology Committee （No 06QH14003）.
