Effect of atomic density on propagation and spectral property of femtosecond chirped Gaussian pulses

Zhendong Wang; Feng Gao

doi:10.1117/12.2181717

4 May 2015 Effect of atomic density on propagation and spectral property of femtosecond chirped Gaussian pulses

Zhendong Wang, Feng Gao

Proceedings Volume 9543, Third International Symposium on Laser Interaction with Matter; 95431U (2015) https://doi.org/10.1117/12.2181717
Event: Third International Symposium on Laser Interaction with Matter, 2014, Jiangsu, China

Abstract

We theoretically investigate the effect of the atomic densities N on propagation and spectral property of femtosecond chirped Gaussian pulse in a three-level Λ-type atomic medium by using the numerical solution of the full Maxwell- Bloch equations. It is shown that, when the positive chirped pulse with area 3π, propagate in the medium with smaller N, pulse splitting doesn’t occur and many small oscillations at the trailing edge of the pulse appear, in addition, the level |2< population ρ₂₂ of the pulse exhibits an oscillation feature with time evolution, moreover, the spectral component near the central frequency of the pulse shows an oscillation characteristic too, and the propagation and spectral property of the negative chirped 3π pulse is very similar to that of the positive chirped 3π pulse. For the positive chirped 3π pulse pulses, propagate in the medium with larger N, pulse splitting also doesn’t occur but many small oscillations both at leading edge and the trailing edge of the pulse appear, and the population ρ₂₂ of the pulse only exhibits an scarcely oscillation feature with time evolution, at the same time many oscillations both in blue shift and red shift components of the pulse appear but the spectral component near the central frequency of the pulse oscillate more severely, and the propagation and spectral property of the negative chirped 3π pulse is very similar to that of the positive chirped 3π pulse, but comparing with the case of the negative chirped 3π pulse, the propagation of the positive chirped 3π pulse is delayed at the same distance and the delayed time becomes longer with the distance increasing.

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Zhendong Wang and Feng Gao "Effect of atomic density on propagation and spectral property of femtosecond chirped Gaussian pulses", Proc. SPIE 9543, Third International Symposium on Laser Interaction with Matter, 95431U (4 May 2015); https://doi.org/10.1117/12.2181717

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KEYWORDS

Femtosecond phenomena

Pulsed laser operation

Chemical species

Gaussian pulse

Finite-difference time-domain method

Magnetism

Molecular interactions

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