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Proceedings Paper

Spectral properties of femtosecond chirped Gaussian pulse propagating in a dense three-level Λ-type atomic medium
Author(s): Zhendong Wang; Zhongbo Liu; Ying Liang; Kening Jia; Xijun Fan
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Paper 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

Paper Details

Date Published: 4 November 2010
PDF: 12 pages
Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460R (4 November 2010); doi: 10.1117/12.868461
Show Author Affiliations
Zhendong Wang, Shandong Normal Univ. (China)
Taishan Univ. (China)
Zhongbo Liu, Shandong Normal Univ. (China)
Ying Liang, Shandong Normal Univ. (China)
Kening Jia, Shandong Normal Univ. (China)
Xijun Fan, Shandong Normal Univ. (China)

Published in SPIE Proceedings Vol. 7846:
Quantum and Nonlinear Optics
Qihuang Gong; Guang-Can Guo; Yuen-Ron Shen, Editor(s)

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