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Gain and Lasing in Two-Level Optically Dense Resonance Media without Population Inversion Based on Cooperative Phenomena upon Interaction of Light with Matter

Sergei N Bagaev, V. S. Egorov, Peter Moroshkin +2 more

Jun 1, 19991 citation

Saturation effect in multilevel lasing media

V. I. Lvov, A. A. Stepanov, Vladimir A. Shcheglov

USSR Rept Phys Math JPRS UPMJun 1, 19850 citations

Lasers and laser systems based on cooperative phenomena in optically dense resonance media without population inversion. (A review)

В. В. Васильев, V. S. Egorov, Alexander N. Fedorov +1 more

Optics and SpectroscopyJan 1, 19947 citations

Random lasing and weak localization of light in transparent Nd+3 doped phosphate glass

Jingwen Zhang, Long Xu, Hao Wang +4 more

Random lasing action and weak localization of light were observed in multiple visible wavelengths with highly transparent, Nd+3 doped phosphate glass gain media, with strong energy redistribution between different frequencies under different pumping powers. A tentative model based on photoinduced scattering was proposed and verified with a He-Ne laser beam in probing the lasing zone. The remarkable coherency and intensity changes of the probing laser beam confirmed the local, random scattering behind the photoinduced random lasing and the localization of light.Random lasing action and weak localization of light were observed in multiple visible wavelengths with highly transparent, Nd+3 doped phosphate glass gain media, with strong energy redistribution between different frequencies under different pumping powers. A tentative model based on photoinduced scattering was proposed and verified with a He-Ne laser beam in probing the lasing zone. The remarkable coherency and intensity changes of the probing laser beam confirmed the local, random scattering behind the photoinduced random lasing and the localization of light.

Applied Physics LettersJan 14, 201329 citations

Mirrorless lasing and cooperative scattering with cold atoms

William Guerin

Jun 18, 20201 citation

Observation of green lasing at 537 nm from Er-ions by coupled photon–atom modes in a random cavity

Van Hoi Pham, Thuy Chi, Huy Bui +2 more

Abstract We present new results of a laser phenomenon that gives rise to a narrow green emission mode in a random photonic-crystal cavity based on an Er-doped glass–air gap–polymer with a 976 nm diode laser pump. Lasing occurs at 537 nm, which does not respond to the resonant radiative transition 2 H 11/2→4 I 15/2; 4 S 3/2→4 I 15/2 in Erbium ions. This effect can be seen as photon–atom coupling in the context of the interaction between a single atom and/or a few atoms and resonant optical media, such as cavities or photonic crystals. Experimental results show that the random lasing mode directly originates from the coupled photon–atom mode inside the random cavity. The measured Q-factor is of 2100–2800 for a random cavity with an air gap of 600–1700 nm between Er-doped glass fiber and a coated polymer layer.Abstract We present new results of a laser phenomenon that gives rise to a narrow green emission mode in a random photonic-crystal cavity based on an Er-doped glass–air gap–polymer with a 976 nm diode laser pump. Lasing occurs at 537 nm, which does not respond to the resonant radiative transition 2 H 11/2→4 I 15/2; 4 S 3/2→4 I 15/2 in Erbium ions. This effect can be seen as photon–atom coupling in the context of the interaction between a single atom and/or a few atoms and resonant optical media, such as cavities or photonic crystals. Experimental results show that the random lasing mode directly originates from the coupled photon–atom mode inside the random cavity. The measured Q-factor is of 2100–2800 for a random cavity with an air gap of 600–1700 nm between Er-doped glass fiber and a coated polymer layer.

Advances in Natural Sciences Nanoscience and NanotechnologyMar 1, 20111 citation

Cooperative lasing of multiply doped laser media

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