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Physical Review A

Effects of injected atomic coherence in broad-area lasers (7 pages)

Óscar G. Calderón

Published Jan 1, 2005• 0 citations
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Related papers

Effects of injected atomic coherence in broad-area lasers

Óscar G. Calderón, E. Cabrera, F. Carreño +3 more

We analyze the effect of injected atomic coherence on transverse patterns of a broad area laser by means of the semiclassical two-level Maxwell-Bloch equations. A single longitudinal mode is considered. The injected atomic coherence forces a spatially homogeneous profile to appear and locks the field phase to a single value. Above a pump threshold value a very rich scenario of patterns is developed. Near threshold we find stationary patterns such as rhombic and hexagonal lattices. Well above threshold nonstationary patterns such as complex highly ordered vortex lattices traveling along the cross section, and nearly traveling waves appear.

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A synchronized broad-area laser array (SBLA) can produce a highly coherent light source whose output intensity is proportional to the square of the number of lasers in the array. High contrast optical intensity modulation can be achieved by utilizing the nonlinear response of the total output intensity to the injected light, resulting in fast optical switching. SBLA can be applied to phased array antenna and beam steering. Semiconductor laser array capability provides a unique opportunity not only for free-space adaptive optical communication but also for free-space quantum adaptive optical communications through the atmosphere. In this paper, we propose a paradigm that illustrates how quantum communication (which provides quantum ultra-security) can take advantage of ultrashort pules, high repetition rate, high power density (due to coherent beam coupling), and spatial beam control.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 1, 2002•1 citation

Atomic coherence and novel laser systems

Guo Qin Ge

•Jan 1, 2001•0 citations
We analyze the effect of injected atomic coherence on transverse patterns of a broad area laser by means of the semiclassical two-level Maxwell-Bloch equations. A single longitudinal mode is considered. The injected atomic coherence forces a spatially homogeneous profile to appear and locks the field phase to a single value. Above a pump threshold value a very rich scenario of patterns is developed. Near threshold we find stationary patterns such as rhombic and hexagonal lattices. Well above threshold nonstationary patterns such as complex highly ordered vortex lattices traveling along the cross section, and nearly traveling waves appear.
A synchronized broad-area laser array (SBLA) can produce a highly coherent light source whose output intensity is proportional to the square of the number of lasers in the array. High contrast optical intensity modulation can be achieved by utilizing the nonlinear response of the total output intensity to the injected light, resulting in fast optical switching. SBLA can be applied to phased array antenna and beam steering. Semiconductor laser array capability provides a unique opportunity not only for free-space adaptive optical communication but also for free-space quantum adaptive optical communications through the atmosphere. In this paper, we propose a paradigm that illustrates how quantum communication (which provides quantum ultra-security) can take advantage of ultrashort pules, high repetition rate, high power density (due to coherent beam coupling), and spatial beam control.