We investigate the optical Kerr effect of SrTiO3 (STO) crystal,of which the nonlinear response time was measured to be less than 200fs,while the nonlinear refractive index is estimated to be 2.16 × 10^(-15)cm^(2)...We investigate the optical Kerr effect of SrTiO3 (STO) crystal,of which the nonlinear response time was measured to be less than 200fs,while the nonlinear refractive index is estimated to be 2.16 × 10^(-15)cm^(2)/W.Using theoptical Kerr gate (OKG) technique with an STO crystal as the Kerr medium,we obtain narrow-bandwidth and symmetric gated spectra from a supercontinuum generated in distilled water by a femtosecond laser.The experimental results show superiority compared with the gated spectra obtained using OKG with CS2 as the Kerr medium,demonstrating that STO crystal is a promising OKG medium.展开更多
The influence of the coherent artifact in a semiconductor Ga-doped ZnO film on femtosecond pump-probe measurement is studied.The coherent artifact mixed into the pump-probe signal can be directly inspected by detectin...The influence of the coherent artifact in a semiconductor Ga-doped ZnO film on femtosecond pump-probe measurement is studied.The coherent artifact mixed into the pump-probe signal can be directly inspected by detecting the background-free first-order diffraction signal induced by the interference between the pump and probe pulses.Experimental results show that by varying the polarization angle or adjusting the relative intensity between the pump and probe pulses,the coherent artifact can be eliminated from the pump-probe measurement.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 91123028 and 11074197the National Basic Research Program of China under Grant No 2012CB921804the Eyas Project of the Academy of Opto-Electronics,Chinese Academy of Sciences。
文摘We investigate the optical Kerr effect of SrTiO3 (STO) crystal,of which the nonlinear response time was measured to be less than 200fs,while the nonlinear refractive index is estimated to be 2.16 × 10^(-15)cm^(2)/W.Using theoptical Kerr gate (OKG) technique with an STO crystal as the Kerr medium,we obtain narrow-bandwidth and symmetric gated spectra from a supercontinuum generated in distilled water by a femtosecond laser.The experimental results show superiority compared with the gated spectra obtained using OKG with CS2 as the Kerr medium,demonstrating that STO crystal is a promising OKG medium.
基金by the National Natural Science Foundation of China under Grant No 11074197the Specialized Research Fund for the Doctoral Program of Higher Education of China under the Grant No 200806980022。
文摘The influence of the coherent artifact in a semiconductor Ga-doped ZnO film on femtosecond pump-probe measurement is studied.The coherent artifact mixed into the pump-probe signal can be directly inspected by detecting the background-free first-order diffraction signal induced by the interference between the pump and probe pulses.Experimental results show that by varying the polarization angle or adjusting the relative intensity between the pump and probe pulses,the coherent artifact can be eliminated from the pump-probe measurement.
