Gain-assisted high-dimensional self-trapped laser beams at very low light levels

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.023816· OSTI ID:21537226

Huijun, Li ^[1]; Liangwei, Dong ^[2]; Chao, Hang ^[3]; Guoxiang, Huang ^[1]

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1. Institute of Nonlinear Physics, Zhejiang Normal University, Jinhua 321004, Zhejiang (China)
2. Department of Physics, Zhejiang Normal University, Jinhua 321004, Zhejiang (China)
3. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062 (China)

We propose a scheme to generate high-dimensional self-trapped laser beams at a very low light intensity via atomic coherence. The system we consider is a resonant four-level atomic ensemble, working in an active Raman gain regime and at room temperature. We derive a high-dimensional nonlinear envelope equation for a signal field with a specific saturable nonlinearity. We show that because of the quantum interference effect induced by a control field, the imaginary part of the coefficients of the signal-field envelope equation can be much smaller than their real part. We demonstrate that the system supports gain-assisted, stable, high-dimensional spatial optical solitons and long-lifetime vortices, which can be produced with light power at the microwatt level.

• OSTI ID: 21537226
• Journal Information: Physical Review. A, Vol. 83, Issue 2; Other Information: DOI: 10.1103/PhysRevA.83.023816; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
GAIN
INTERFERENCE
LASERS
LIFETIME
NONLINEAR PROBLEMS
PHOTON BEAMS
RAMAN EFFECT
SIGNALS
SOLITONS
TEMPERATURE RANGE 0273-0400 K
TRAPPING
VISIBLE RADIATION
VORTICES
AMPLIFICATION
BEAMS
ELECTROMAGNETIC RADIATION
QUASI PARTICLES
RADIATIONS
TEMPERATURE RANGE