4 November 2010 Spectral properties of femtosecond chirped Gaussian pulse propagating in a dense three-level Λ-type atomic medium
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Abstract
It is shown that, variation of the sign and size of the chirp coefficient (C) of the pulse has considerable effect on spectral properties of the pulse and the effect is closely relative to size of the pulse area. When the pulse with smaller area, 2π pulse, propagates in the medium, pulse splitting doesn't occur and the pulse evolves gradually to an approximate normal Gaussian pulse (C=0); new high frequency component doesn't basically appear; with increasing value of C, oscillation amplitude of blue shift and red shift components increases and blue shift component oscillates more severely; moreover, the strength of the spectral component near the central frequency decreases considerably but the strength of blue shift component increases obviously. When the 4π pulse propagates in the medium, the pulse will split into sub-pulses with different numbers and shapes, new high frequency component can be produced, but the strength of the high frequency component is smaller; similar to the case of 2π pulse, blue shift component oscillates more severely; in addition, the strength of the spectral component with higher frequency decreases evidently with increasing value of C. When the pulse with larger area, 8π pulse, propagates in the medium, the pulse splitting is similar to that in the 4π pulse case, but supercontinuum spectrum with larger strength, higher frequency and wider frequency range than that in the 4π pulse case can be obtained; varying the sign and size of C can not produce new high frequency component, but can change strength of different frequency components in the spectrum, thus can get high frequency components with higher strength
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Zhendong Wang, Zhongbo Liu, Ying Liang, Kening Jia, Xijun Fan, "Spectral properties of femtosecond chirped Gaussian pulse propagating in a dense three-level Λ-type atomic medium", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460R (4 November 2010); doi: 10.1117/12.868461; https://doi.org/10.1117/12.868461
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