aqora

Collective superfluorescence of three-level systems stimulated by intense laser field

N. A. Enaki, Yu. M. Shvera

Optics and SpectroscopyAug 1, 19883 citations

Coherent Amplification of Continuous Laser Field via Superfluorescence

K. Kitano, H. Maeda

Superfluorescence (SF) is collective spontaneous emission wherein radiators spontaneously synchronize, resulting in an intense single-pulse emission. The avalanche radiation of photons is initiated by the first photon emitted into the SF propagation mode. Because this process is stochastic, the absolute phase of the SF changes randomly from shot to shot. We demonstrate that this phase can be controlled by seeding the SF with a resonant continuous-wave (CW) laser. The seed light was weak enough not to cause the stimulated emission but strong enough to inject the first photon into the SF propagation mode prior to injection by the radiators themselves. Cross-correlation measurements between the seeded SF and CW laser revealed that the seed light was coherently amplified by the SF. The amplification factor for the instantaneous intensity was estimated to be 7 orders of magnitude. These results will pave the way for the development of new types of quantum optical amplifiers.Superfluorescence (SF) is collective spontaneous emission wherein radiators spontaneously synchronize, resulting in an intense single-pulse emission. The avalanche radiation of photons is initiated by the first photon emitted into the SF propagation mode. Because this process is stochastic, the absolute phase of the SF changes randomly from shot to shot. We demonstrate that this phase can be controlled by seeding the SF with a resonant continuous-wave (CW) laser. The seed light was weak enough not to cause the stimulated emission but strong enough to inject the first photon into the SF propagation mode prior to injection by the radiators themselves. Cross-correlation measurements between the seeded SF and CW laser revealed that the seed light was coherently amplified by the SF. The amplification factor for the instantaneous intensity was estimated to be 7 orders of magnitude. These results will pave the way for the development of new types of quantum optical amplifiers.

Physical Review LettersFeb 12, 20243 citations

Polarization and diffraction structure of superfluorescence

Yu. A. Avetisyan, Evgenii Dmitrievich Trifonov

Optics and SpectroscopyMay 1, 19993 citations

Superfluorescence from degenerate media (A)

J.A. Hermann, R. Bullough

Journal of the Optical Society of America AMay 1, 19783 citations

Cavity-Free Mode Control of Superfluorescence from Thermal Gas

H. Maeda, K. Kitano

Transverse-mode control of light has traditionally relied on optical cavities, whereas recent cavity-free approaches based on periodically arranged cold atoms that exploit collective radiation have attracted increasing attention. Here, we demonstrate a new cavity-free method applicable to thermal gases. Using crossed femtosecond laser pulses, we excite rubidium atoms and observe superfluorescence (SF) emitted during an ultrafast relaxation process. We demonstrate successful control of the transverse modes of SF when the interference fringes formed by the crossed beams are resonant with half the SF wavelength. This ultrafast, cavity-free approach provides a versatile playground for studying interactions between quantum many-body systems and well-defined electromagnetic fields in free space.Transverse-mode control of light has traditionally relied on optical cavities, whereas recent cavity-free approaches based on periodically arranged cold atoms that exploit collective radiation have attracted increasing attention. Here, we demonstrate a new cavity-free method applicable to thermal gases. Using crossed femtosecond laser pulses, we excite rubidium atoms and observe superfluorescence (SF) emitted during an ultrafast relaxation process. We demonstrate successful control of the transverse modes of SF when the interference fringes formed by the crossed beams are resonant with half the SF wavelength. This ultrafast, cavity-free approach provides a versatile playground for studying interactions between quantum many-body systems and well-defined electromagnetic fields in free space.

Physical Review LettersMay 11, 20260 citations

Polarization of resonance fluorescence of an atom with degenerate levels in a strong field

Б. В. Крыжановский, A. O. Melikyan

Journal of Experimental and Theoretical PhysicsDec 1, 19800 citations

Controlling the polarization of superfluorescence in a degenerate system using a continuous resonant laser field

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