Wave-coupling theory of linear electro-optic effect for ultrashort laser pulses |
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| Authors: | D Zhong and W She |
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| Institution: | (1) College of Electronic Science and Engineering, State Key Laboratory of Integrated Optoelectronics, Jilin University, Changchun, 130012, P.R. China;(2) Department of Computer Engineering, College of Zhuhai, Jinan University, Zhuhai, 519070, P.R. China;(3) Institute No. 25 of the Second Academy, China Aerospace Science & Industry Corp., Beijing, 100854, P.R. China;(4) State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, P.R. China; |
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| Abstract: | A wave-coupling theory of linear electro-optic (EO) effect for ultrashort laser pulses has been developed. As one of its applications,
the linear EO effect of ultrashort Gaussian pulses propagating in LiNbO3 crystal is demonstrated, with the intensity lower than the damage threshold. It is found that the EO effect is sensitive
to both the azimuth angle and the polar angle of wave vector of light. And the larger the applied electric field, the shorter
the crystal used for optimization of EO coupling is. The numerical results show that, with the duration of input pulse changing
from 150 fs to 5 fs, the durations of output pulses are broadened due to the group-velocity dispersion, as well as the first-
and second-order refractive dispersion. In addition, when input pulse duration is larger than 20 fs, in contrast with zero
chirp, the output durations can be slightly compressed if a positive chirp input pulse is used. The validities of slowly varying
amplitude approximation and continuous wave approximation are also discussed. The influence of self-phase modulation and cross-phase
modulation on the EO effect is also discussed briefly. |
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