中国物理B ›› 2018, Vol. 27 ›› Issue (10): 104209-104209.doi: 10.1088/1674-1056/27/10/104209

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Optical power limiting of ultrashort hyper-Gaussian pulses in cascade three-level system

Ji-Cai Liu(刘纪彩), Fen-Fen Guo(郭芬芬), Ya-Nan Zhao(赵亚男), Xing-Zhe Li(李兴哲)   

  1. Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China
  • 收稿日期:2018-05-31 修回日期:2018-07-03 出版日期:2018-10-05 发布日期:2018-10-05
  • 通讯作者: Ji-Cai Liu E-mail:jicailiu@ncepu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11574082) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2018MS050).

Optical power limiting of ultrashort hyper-Gaussian pulses in cascade three-level system

Ji-Cai Liu(刘纪彩), Fen-Fen Guo(郭芬芬), Ya-Nan Zhao(赵亚男), Xing-Zhe Li(李兴哲)   

  1. Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China
  • Received:2018-05-31 Revised:2018-07-03 Online:2018-10-05 Published:2018-10-05
  • Contact: Ji-Cai Liu E-mail:jicailiu@ncepu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11574082) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2018MS050).

摘要:

Propagation of strong femtosecond hyper-Gaussian pulses in a cascade three-level molecular system is studied by solving numerically the Maxwell-Bloch equations by the iterative predictor-corrector finite-difference time-domain method. Optical power limiting behavior induced by strong nonlinear two-photon absorption is observed for different orders of the femtosecond hyper-Gaussian pulses. Pulses of a higher order temporal profile are found to have a wider power range of optical limiting but a larger output saturation intensity. Both the output saturation value and the damage threshold of optical power limiting decrease with pulse duration increasing. The decrease of the pulse area along the pulse propagation is much slower than that obtained from the two-photon area theorem due to invalidity of the slowly varying amplitude approximation and the monochromatic field hypothesis.

关键词: optical power limiting, two-photon absorption, ultrashort hyper-Gaussian pulse, cascade three-level system

Abstract:

Propagation of strong femtosecond hyper-Gaussian pulses in a cascade three-level molecular system is studied by solving numerically the Maxwell-Bloch equations by the iterative predictor-corrector finite-difference time-domain method. Optical power limiting behavior induced by strong nonlinear two-photon absorption is observed for different orders of the femtosecond hyper-Gaussian pulses. Pulses of a higher order temporal profile are found to have a wider power range of optical limiting but a larger output saturation intensity. Both the output saturation value and the damage threshold of optical power limiting decrease with pulse duration increasing. The decrease of the pulse area along the pulse propagation is much slower than that obtained from the two-photon area theorem due to invalidity of the slowly varying amplitude approximation and the monochromatic field hypothesis.

Key words: optical power limiting, two-photon absorption, ultrashort hyper-Gaussian pulse, cascade three-level system

中图分类号:  (Ultrafast processes; optical pulse generation and pulse compression)

  • 42.65.Re
42.65.Sf (Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics) 32.80.Wr (Other multiphoton processes) 42.65.-k (Nonlinear optics)