Broadly tunable coherent VUV/XUV radiations from 92 to 145 nm were generated by nonresonant four-wave sum-mixing (FWSM) and third-harmonic generation (THG) in pulsed jet of Xe or Kr. The dependence of phase-matching o...Broadly tunable coherent VUV/XUV radiations from 92 to 145 nm were generated by nonresonant four-wave sum-mixing (FWSM) and third-harmonic generation (THG) in pulsed jet of Xe or Kr. The dependence of phase-matching on gas density, atomic dispersion was observed. THG enhanced by third-photon resonant with the high Rydberg states in Xe was observed, and the resolved principal quantum number was up to 34.展开更多
Tunable coherent radiation of wavelength between 92 nm and 122 nm has been produced in molecular gases of N2, CO, H2 and CH4 by resonant and nonresonant third harmonic generation. Factors with respect to the frequency...Tunable coherent radiation of wavelength between 92 nm and 122 nm has been produced in molecular gases of N2, CO, H2 and CH4 by resonant and nonresonant third harmonic generation. Factors with respect to the frequency conversion efficiency, including the line strength of the nonlinear susceptibility, the density of the media and the phase-matching, are discussed. By analyzing the characteristics of the four-wave mixing spectra in molecular gases, some physical parameters and the population of the energy levels are obtained. This indicates that nonlinear optical frequency conversion process provides a useful method to study the structure and spectra of molecules.展开更多
Tunable coherent radiations in the range of 83-170nm have been generated in Xe,Kr and Ar by resonant and nonresonant four-wave sum-mixing,four-wave sum-differenoe-mixing and third harmonic processes.The physical mecha...Tunable coherent radiations in the range of 83-170nm have been generated in Xe,Kr and Ar by resonant and nonresonant four-wave sum-mixing,four-wave sum-differenoe-mixing and third harmonic processes.The physical mechanism for the generation of the coherent XUV/VUV radiations is investigated.Broadly tunable coherent radiation was generated by nonresonant four-wave sum-mixing for the first time below the first resonance level of nonlinear media,and multicoherence length interference between the driving polarization and induced radiation was observed.展开更多
基金National Natural Science Foundation of ChinaHigh Technoque Program of Lasers.
文摘Broadly tunable coherent VUV/XUV radiations from 92 to 145 nm were generated by nonresonant four-wave sum-mixing (FWSM) and third-harmonic generation (THG) in pulsed jet of Xe or Kr. The dependence of phase-matching on gas density, atomic dispersion was observed. THG enhanced by third-photon resonant with the high Rydberg states in Xe was observed, and the resolved principal quantum number was up to 34.
文摘Tunable coherent radiation of wavelength between 92 nm and 122 nm has been produced in molecular gases of N2, CO, H2 and CH4 by resonant and nonresonant third harmonic generation. Factors with respect to the frequency conversion efficiency, including the line strength of the nonlinear susceptibility, the density of the media and the phase-matching, are discussed. By analyzing the characteristics of the four-wave mixing spectra in molecular gases, some physical parameters and the population of the energy levels are obtained. This indicates that nonlinear optical frequency conversion process provides a useful method to study the structure and spectra of molecules.
基金Project supported by the National Natural Science Foundation of ChinaHigh-Tech Program of China in Laser Area
文摘Tunable coherent radiations in the range of 83-170nm have been generated in Xe,Kr and Ar by resonant and nonresonant four-wave sum-mixing,four-wave sum-differenoe-mixing and third harmonic processes.The physical mechanism for the generation of the coherent XUV/VUV radiations is investigated.Broadly tunable coherent radiation was generated by nonresonant four-wave sum-mixing for the first time below the first resonance level of nonlinear media,and multicoherence length interference between the driving polarization and induced radiation was observed.
