THEORY OF INTERBAND COHERENCE AND INVERSIONLESS BISTABILITY IN SEMICONDUCTOR LASERS

doi:10.1088/1009-1963/9/11/004

Abstract

Abstract Coherent transitions of charge carriers between the conduction and valence bands of a semiconductor medium are essential for the operation of a semiconductor laser. In this paper, we study how such interband coherence can be set up by an injection current and a coherent pump-field. In the absence of the pump-field, the injection current is the only source to establish the interband coherence in a semiconductor laser system. A laser threshold is obtained, which shows that a strongly coupled high-Q microcavity has a low threshold value. However, when an external pump-field serving as another mechanism to create the interband coherence is applied, the threshold value of the injection current can be lowered and it vanishes for sufficiently strong field. Besides, if the pump-field exceeds a threshold value, it is even possible to achieve a bistability in the inversionless region. Some fundamental macroscopic properties, including polarization, absorption and dispersion for the semicoductor system, are also obtained analytically.

Keywords: interband coherence inversionless bistability semiconductor laser

Received: 13 April 2000
Revised: 15 July 2000
Accepted manuscript online:

PACS:	42.55.Px	(Semiconductor lasers; laser diodes)
	42.60.Da	(Resonators, cavities, amplifiers, arrays, and rings)
	42.60.Jf	(Beam characteristics: profile, intensity, and power; spatial pattern formation)
	42.60.Lh	(Efficiency, stability, gain, and other operational parameters)
	42.65.Pc	(Optical bistability, multistability, and switching, including local field effects)

Fund: Project supported by the Hong Kong Research Grants Council (Grant No. CUHK 4282/00P), the National Natural Science Foundation of China(Grant No. 69688004), GGQ is also supported by the Visiting Scholar Foundation of Key Laboratory of Laser Technology, Hua

Cite this article:

Ge Guo-qin (葛国勤), Leung Pui Tang (梁培) THEORY OF INTERBAND COHERENCE AND INVERSIONLESS BISTABILITY IN SEMICONDUCTOR LASERS 2000 Chinese Physics 9 813

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THEORY OF INTERBAND COHERENCE AND INVERSIONLESS BISTABILITY IN SEMICONDUCTOR LASERS

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