New techniques for controlling the amplitudes of two orthogonal linearly polarized light are presented. One is based on adjusting the DC voltage into a Mach–Zehnder modulator（MZM） to alter the amplitude of the ligh...New techniques for controlling the amplitudes of two orthogonal linearly polarized light are presented. One is based on adjusting the DC voltage into a Mach–Zehnder modulator（MZM） to alter the amplitude of the light traveling on the slow axis of a fiber into the modulator with little changes in the fast-axis light amplitude.Another is based on adjusting the input DC voltages of a dual-polarization MZM operating in the reverse direction, which enables independent control of the two input orthogonal linearly polarized light amplitudes.Experimental results demonstrate that more than 30 dB difference in slow-and fast-axis light power can be obtained by controlling an MZM input DC voltage, and over 24 dB independent power adjustment for light traveling on the slow and fast axes into a dual-polarization MZM.展开更多
We investigate the nonadiabatic spectral redshift of high-order harmonic of He driven by two time-delayed orthogonally polarized laser fields. It is found that the nonadiabatic spectral redshift can be observed by pro...We investigate the nonadiabatic spectral redshift of high-order harmonic of He driven by two time-delayed orthogonally polarized laser fields. It is found that the nonadiabatic spectral redshift can be observed by properly adjusting the time delay of the two laser fields when the controlling pulse is added in the raising part of the driving pulse in the vertical direction. That is because the controlling pulse in the vertical direction prevents the ionized electrons from returning to the vicinity of parent ions and then reduces the recombination probability. This leads to the high-order harmonic generated mainly in the falling part of the driving pulse. Meanwhile,we also find that the quantity of redshift can be effectively controlled through accommodating the positive time delays. In addition, this scheme can also be used to produce nonadiabatic spectral blueshift.展开更多
This paper designs a current-mode Wien-bridge oscillator to use current-controlled conveyor(CCCIIs)based on the traditional Wien-bridge oscillator and the adjoint network theorem.This oscillator employs only four CCCI...This paper designs a current-mode Wien-bridge oscillator to use current-controlled conveyor(CCCIIs)based on the traditional Wien-bridge oscillator and the adjoint network theorem.This oscillator employs only four CCCIIs and two grounded capacitors.Its resonant condition and resonant frequency can be independently and electronically varied by tuning bias currents of the CCCIIs linearly.Then this oscillator is simple in design,compact in size,and convenient in adjustment.The oscillator analysis and computer simulation results have been included to support the generation method.展开更多
文摘New techniques for controlling the amplitudes of two orthogonal linearly polarized light are presented. One is based on adjusting the DC voltage into a Mach–Zehnder modulator（MZM） to alter the amplitude of the light traveling on the slow axis of a fiber into the modulator with little changes in the fast-axis light amplitude.Another is based on adjusting the input DC voltages of a dual-polarization MZM operating in the reverse direction, which enables independent control of the two input orthogonal linearly polarized light amplitudes.Experimental results demonstrate that more than 30 dB difference in slow-and fast-axis light power can be obtained by controlling an MZM input DC voltage, and over 24 dB independent power adjustment for light traveling on the slow and fast axes into a dual-polarization MZM.
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.11404153,11135002,11604119,and 11405077)the Fundamental Research Funds for the Central Universities of China(No.lzujbky-2017-14)
文摘We investigate the nonadiabatic spectral redshift of high-order harmonic of He driven by two time-delayed orthogonally polarized laser fields. It is found that the nonadiabatic spectral redshift can be observed by properly adjusting the time delay of the two laser fields when the controlling pulse is added in the raising part of the driving pulse in the vertical direction. That is because the controlling pulse in the vertical direction prevents the ionized electrons from returning to the vicinity of parent ions and then reduces the recombination probability. This leads to the high-order harmonic generated mainly in the falling part of the driving pulse. Meanwhile,we also find that the quantity of redshift can be effectively controlled through accommodating the positive time delays. In addition, this scheme can also be used to produce nonadiabatic spectral blueshift.
基金the Natural Science Foundation of Shaanxi Province(2017JM6087)。
文摘This paper designs a current-mode Wien-bridge oscillator to use current-controlled conveyor(CCCIIs)based on the traditional Wien-bridge oscillator and the adjoint network theorem.This oscillator employs only four CCCIIs and two grounded capacitors.Its resonant condition and resonant frequency can be independently and electronically varied by tuning bias currents of the CCCIIs linearly.Then this oscillator is simple in design,compact in size,and convenient in adjustment.The oscillator analysis and computer simulation results have been included to support the generation method.
