18 November 2014 Interference resonant propagation and spectral properties of double femtosecond chirped Gaussian pulses in three-level Λ-type atomic medium
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Abstract
The interference resonant propagation and spectral properties of a superposition of two femtosecond chirped Gaussian pulses with equal pulse area and same size but opposite sign of the chirp coefficient (C) in a three-level Λ-type atomic medium is investigated by using the numerical solution, which is obtained by the finite-difference time-domain (FDTD) method and the iterative predictor–corrector (PC) method for the full Maxwell–Bloch equations. It is found that, for the double pulses with smaller area, (2π, 2π) double pulses, the pulse splitting occurs when the value of the |C| is smaller, and only the variation of pulse shape is present but the pulse splitting no longer occur when the value of the |C| increases to a certain value; New high frequency component doesn’t basically appear and the strength of the spectral component near the central frequency decreases considerably but the strength of blue shift component is not varied obviously with the value of |C| increasing. For the double pulses with larger areas, the case of pulse splitting is similar to that of (2π, 2π) pulses, but the strength of the spectral component with higher frequency increase evidently comparing with the case of (2π, 2π) double pulses. Moreover, the value of the |C| also has an obvious effect on population, different population evolutions can be achieved by adjusting the value of |C|.
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Zhendong Wang, Rongfang Ji, Jing Xiao, Jianling Ma, Tingting Liu, "Interference resonant propagation and spectral properties of double femtosecond chirped Gaussian pulses in three-level Λ-type atomic medium", Proc. SPIE 9269, Quantum and Nonlinear Optics III, 926917 (18 November 2014); doi: 10.1117/12.2067981; https://doi.org/10.1117/12.2067981
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