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| 1 | Sub-10-fs pulse generation directly from a KLM Ti: sapphire laser显示文摘By reducing the effects of frequency dependent mode size and intracavity gain saturation of a KLM Ti: sapphire laser, the pulse bandwidth broadening is enhanced significantly. 8.5 fs pulses with the bandwidth of 92 nm at wavelength of 710 nm have been generated directly from this laser and measured with an extracavity group velocity dispersion compensation system. | Weizhu Lin Rui Liao Jinhui Wen Zhigang Liu Li Deng Haichao Zhang Tianshu Lai | 2002 | Chinese Science Bulletin2002，47，12： | 5 |
| 2 | Femtosecond Studies on Third-Order Optical Nonlinearities of Polyanilines显示文摘The ultrafast dynamics of third order nonlinearities of polyaniline(PAn)and polyaniline doped in polymethyl mathacrylate(PAn-PMMA)films are investigated using femtosecond absorption spectroscopy.An ultrafast initial exciton deformation time of about 100fs is observed in PAn film.In PAn-PMMA film,the third-order nonlinearity results in an efficient two-photon absorption at about 2eV. | WANG Hui LAI Tianshu LIN Weizhu MO Dang OUYANG Meng GONG Kecheng | 1994 | Chinese Physics Letters1994，11，8： | 2 |
| 3 | Effects of cavity-dispersion noncoaxiality on the generation of ultrabroadband femtosecond pulses显示文摘The effects of cavity-dispersion noncoaxiality (CDN) on the generation of ultrabroadband femtosecond pulses in KLM Ti:sapphire laser were investigated theoretically and experimentally. It was predicted that when the laser sub-cavity works near the coaxial operation point, the limitation of CDN on the bandwidth broadening is minimum, which is favorable for ultrabroadband pulse generation. On the basis of this prediction, femtosecond pulses with bandwidth of 650 to 1000 nm were directly generated from a home built KLM Ti:sapphire laser. To our knowledge, they are the broadest bandwidth pulses produced from KLM Ti:sapphire laser with similar oscillator configuration and gain crystal length of 3 mm. | JIAO ZhongXing LEI Liang HUANG ZhiLing WEN dinHui LAI Tianshu LIN WeiZhu | 2008 | Chinese Science Bulletin2008，53，5： | 1 |
| 4 | Electronic properties and tunability in graphene/3D-InP mixed-dimensional van der Waals heterostructure显示文摘InP solar cell is promising for space application due to its strong space radiation resistance and high power conversion efficient(PCE).Graphene/InP heterostructure solar cell is expected to have a higher PCE because strong near-infrared light can also be absorbed and converted additionally by graphene in this heterostructure.However,a low PCE was reported experimentally for Graphene/InP heterostructures.In this paper,electronic properties of graphene/InP heterostructures are calculated using density functional theory to understand the origin of the low PCE and propose possible improving ways.Our calculation results reveal that graphene contact with InP form a p-type Schottky heterostructure with a low Schottky barrier height(SBH).It is the low SBH that leads to the low PCE of graphene/InP heterostructure solar cells.A new heterostructure,graphene/insulating layer/InP solar cells,is proposed to raise SBH and PCE.Moreover,we also find that the opened bandgap of graphene and SBH in graphene/InP heterostructures can be tuned by exerting an electric field,which is useful for photodetector of graphene/InP heterostructures. | Qingyun Zhou Yusheng Hou Tianshu Lai | 2023 | Frontiers of physics2023，18，2： | 0 |
| 5 | Ultrafast dynamics of photoexcited carriers and coherent phonons in ultrathin Bi;Te;thermoelectric films显示文摘The ultrafast dynamics of photoexcited carriers and coherent phonons in ultrathin Bi;Te;thermoelectric films are studied through transient differential transmission spectroscopy.An ultralow frequency coherent optical phonon at 0.16 THz emerges,especially in ultrathin films,and it is ascribed to interlayer breathing modes.It can divide the ultrathin films into two groups which have outof-phase vibration along the normal of a film plane,causing a destructive interference between in-plane propagating thermal waves in the two groups of quintuple layers,and thus possibly reducing the thermal conductivity of the ultrathin films.The excitation power dependence of ultrafast dynamics reveals carrier-carrier scattering dominating thermalization,which provides a microscopic understanding of the reported high electrical conductivity and anomalously high power factor of ultrathin Bi;Te;films at room temperature. | Zemin Xu Jiandong Yao Guowei Yang Tianshu Lai | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，1： | 0 |
| 6 | Control of the ultrafast photo-electronic dynamics of a chemical-vapor-deposited-grown graphene by ozone oxidation显示文摘Diverse ultrafast dynamics have been reported on different graphene prepared by different methods.Chemicalvapor-deposited(CVD)growth is regarded as a very promising method for highly efficient production of graphene.However,CVD-grown graphene usually presents only one of the diverse ultrafast dynamics.Thus,control of the ultrafast photo-electronic dynamics of CVD-grown graphene is vital to present diversity for different photodetection applications of CVD-grown graphene.In this paper,we report on the first realization to our knowledge of control of the ultrafast dynamics of CVD-grown graphene and the manifestation of diverse ultrafast dynamics on sole CVD-grown graphene.We study the ultrafast photoelectronic dynamics of CVD-grown graphene with different degrees of oxidation caused by ozone oxidation using femtosecond time-resolved transient differential transmission spectroscopy,and we find that the ultrafast dynamics can evolve obviously with the time of ozone oxidation.The diverse ultrafast dynamics reported previously on different monolayer graphenes prepared by different methods are achieved on the sole CVD-grown graphene by controlling oxidation time.The mechanism for manipulation of the ultrafast dynamics by ozone oxidation is revealed by Raman spectroscopy as the control of the Fermi level of CVD-grown graphene.Simulations of dynamics based on the optical conductivity model of graphene and Fermi level change well reproduce the observed diverse ultrafast dynamics.Our results are very important for the diverse applications of graphene and open a new path toward the diverse ultrafast dynamics on sole graphene prepared by any method. | MIN GUO LAI-PENG MA WENCAI REN TIANSHU LAI | 2020 | Photonics Research2020，8，1： | 0 |
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