The spatial characteristics of Thomson scattering in a linearly polarized laser field are investigated. The results show that the electron＇s motion and spatial distributions of Thomson scattering depend sensitively o...The spatial characteristics of Thomson scattering in a linearly polarized laser field are investigated. The results show that the electron＇s motion and spatial distributions of Thomson scattering depend sensitively on the phase η0 at which the electron is injected to the laser field. When η0 equals to 0 or π, the electron motion is a zigzag motion and the spatial distributions of the emission show fourfold or twofold symmetry. In other cases of phases, there is a steady drift motion of electron in the transverse direction, which results in the absence of the zigzag motion and a breakdown of the symmetry of the spatial distributions as well.展开更多
Three decades ago,a highly nonlinear nonpertubative phenomenon,now well-known as the high harmonic generation(HHG),was discovered when intense laser irradiates gaseous atoms.As the HHG produces broadband coherent radi...Three decades ago,a highly nonlinear nonpertubative phenomenon,now well-known as the high harmonic generation(HHG),was discovered when intense laser irradiates gaseous atoms.As the HHG produces broadband coherent radiation,it becomes the most promising source to obtain attosecond pulses.The door to the attosecond science was opened ever since.In this review,we will revisit the incredible adventure to the attoworld.Firstly,the progress of attosecond pulse generation is outlined.Then,we introduce the efforts on imaging the structures or filming the ultrafast dynamics of nuclei and electrons with unprecedented attosecond temporal and Angstrom spatial resolutions,utilizing the obtained attosecond pulses as well as the high harmonic spectrum itself.展开更多
We investigate the influence of the birefringence on the high-order harmonics in an a-cut Zn O crystal with midinfrared laser pulses.The high harmonics exhibit strong dependence on the alignment of the crystal with re...We investigate the influence of the birefringence on the high-order harmonics in an a-cut Zn O crystal with midinfrared laser pulses.The high harmonics exhibit strong dependence on the alignment of the crystal with respect to the laser polarization.We introduce the Jones calculus to counteract the birefringent effect and obtain the harmonics with polarization corrections in Zn O.We show that the birefringent effect plays an important role in the orientation dependence of HHG.展开更多
A classical microcanonical 1＋1-dimensional model is used to investigate the ion momentum distributions in nonsequential double ionization with linearly polarized few-cycle pulses. We find that the ion momentum distri...A classical microcanonical 1＋1-dimensional model is used to investigate the ion momentum distributions in nonsequential double ionization with linearly polarized few-cycle pulses. We find that the ion momentum distribution has a strong dependence on the carrier-envelope phase of the few-cycle pulse, which is consistent with the experimental results qualitatively. Back analysis shows that the ionization probability of the first electron at different phases and its returning kinetic energy play the main role on the ion momentum distributions.展开更多
基金the National Natural Science Foundation of China(No.10574050)the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20040487023)
文摘The spatial characteristics of Thomson scattering in a linearly polarized laser field are investigated. The results show that the electron＇s motion and spatial distributions of Thomson scattering depend sensitively on the phase η0 at which the electron is injected to the laser field. When η0 equals to 0 or π, the electron motion is a zigzag motion and the spatial distributions of the emission show fourfold or twofold symmetry. In other cases of phases, there is a steady drift motion of electron in the transverse direction, which results in the absence of the zigzag motion and a breakdown of the symmetry of the spatial distributions as well.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12021004 and 91950202)
文摘Three decades ago,a highly nonlinear nonpertubative phenomenon,now well-known as the high harmonic generation(HHG),was discovered when intense laser irradiates gaseous atoms.As the HHG produces broadband coherent radiation,it becomes the most promising source to obtain attosecond pulses.The door to the attosecond science was opened ever since.In this review,we will revisit the incredible adventure to the attoworld.Firstly,the progress of attosecond pulse generation is outlined.Then,we introduce the efforts on imaging the structures or filming the ultrafast dynamics of nuclei and electrons with unprecedented attosecond temporal and Angstrom spatial resolutions,utilizing the obtained attosecond pulses as well as the high harmonic spectrum itself.
基金the National Natural Science Foundation of China(Grant Nos.91950202,11627809,11874165,11934006,11774109,and 12021004)。
文摘We investigate the influence of the birefringence on the high-order harmonics in an a-cut Zn O crystal with midinfrared laser pulses.The high harmonics exhibit strong dependence on the alignment of the crystal with respect to the laser polarization.We introduce the Jones calculus to counteract the birefringent effect and obtain the harmonics with polarization corrections in Zn O.We show that the birefringent effect plays an important role in the orientation dependence of HHG.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10574050 and 10734080, and the National Basic Research Programme of China under Grant No 2006CB806006
文摘A classical microcanonical 1＋1-dimensional model is used to investigate the ion momentum distributions in nonsequential double ionization with linearly polarized few-cycle pulses. We find that the ion momentum distribution has a strong dependence on the carrier-envelope phase of the few-cycle pulse, which is consistent with the experimental results qualitatively. Back analysis shows that the ionization probability of the first electron at different phases and its returning kinetic energy play the main role on the ion momentum distributions.
