Phase-dependent gain without inversion in an inhomogeneous broadened quasi &#8743;-type four-level system with VIC

Zhongbo Liu; Zhendong Wang; Kening Jia; Dianmin Tong; Xijun Fan

doi:10.1117/12.868434

4 November 2010 Phase-dependent gain without inversion in an inhomogeneous broadened quasi Λ-type four-level system with VIC

Zhongbo Liu, Zhendong Wang, Kening Jia, Dianmin Tong, Xijun Fan

Author Affiliations +

Proceedings Volume 7846, Quantum and Nonlinear Optics; 78460Q (2010) https://doi.org/10.1117/12.868434
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The effect of the relative phase (φ) between the probe and driving fields on the gain without inversion (GWI) is studied in a Doppler broadened quasi Λ-type four-level atomic system with vacuum induced coherence (VIC). It is shown that: The probe detuning region in which GWI exists and size of GWI are very sensitive to variation of the relative phase, the Doppler width ( D ) also has dramatically modulation role on the phase-dependent GWI. The GWI maximum value ( G_max ) varies periodically with the relative phase varying, the period is 2π; but the concrete varying rule is closely related to the value of the Doppler width. In the case of D = 0 (i.e. without Doppler broadening) , when 0 < φ < π, G_max increases monotonously with φ increasing; when π <φ < 2π, G_max decreases monotonously with φ increasing; when φ =π, G_maxhas the largest value. Under the condition of D ≠ 0 (i.e. Doppler broadening presents), in both regions 0 < φ < π and π < φ < 2π, G_max does not monotonically increase or decrease with φ increasing; the value of φ, which corresponds to the largest value of G_max, decreases gradually from π with D increasing, when value of D is large enough, the value of φ, which corresponds to the largest value of G_max, is about π/2. In general speaking, G_max decreases with D increasing; but G_max larger than that in the corresponding static atomic system ( D = 0 ) can be gotten by choosing suitable values of φ and D.

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Zhongbo Liu, Zhendong Wang, Kening Jia, Dianmin Tong, and Xijun Fan "Phase-dependent gain without inversion in an inhomogeneous broadened quasi Λ-type four-level system with VIC", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460Q (4 November 2010); https://doi.org/10.1117/12.868434

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KEYWORDS

Doppler effect

Phase shift keying

Absorption

Complex systems

Chemical species

Modulation

Physics

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