Induced photon statistics in threelevel lasers
Abstract
The statistical properties of light emitted by a threelevel laser are theoretically investigated. In the model considered the threelevel medium is coherently excited by another laser having arbitrary photon statistics. It is shown that under certain conditions the photon statistics of the threelevel laser is determined by that of the exciting laser. This feature is referred to as induced photon statistics. It is proposed to use this phenomenon to analyze the statistics of a laser involved in a feedback process. Arranging an experiment in a way such that the laser of interest serves as a coherent pump for the probe threelevel laser one is able to directly observe the statistics of the feedbackcontrolled laser by simply detecting the induced photon statistics in the threelevel probe system. The analysis of the operation of such twolaser system presented demonstrates, in particular, that the feedback itself is unable to produce a nonclassical state of light which is in complete agreement with the conclusion of Wiseman and Milburn [Phys. Rev. A 49, 1350 (1994)].
 Authors:
 V. A. Fock Physics Institute, St. Petersburg State University, Ul'yanovskaya 1, 198504 Petrodvoretz, St. Petersburg (Russian Federation)
 (Russian Federation)
 Publication Date:
 OSTI Identifier:
 20982191
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.75.023815; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EMISSION; FEEDBACK; LASERS; OPERATION; OPTICAL PUMPING; OPTICS; PHOTONS; STATISTICS; VISIBLE RADIATION
Citation Formats
Golubeva, T., Golubev, Yu., Ivanov, D., and Laser Research Institute, St. Petersburg State University, Ul'yanovskaya 5, 198504 Petrodvoretz, St. Petersburg. Induced photon statistics in threelevel lasers. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVA.75.023815.
Golubeva, T., Golubev, Yu., Ivanov, D., & Laser Research Institute, St. Petersburg State University, Ul'yanovskaya 5, 198504 Petrodvoretz, St. Petersburg. Induced photon statistics in threelevel lasers. United States. doi:10.1103/PHYSREVA.75.023815.
Golubeva, T., Golubev, Yu., Ivanov, D., and Laser Research Institute, St. Petersburg State University, Ul'yanovskaya 5, 198504 Petrodvoretz, St. Petersburg. Thu .
"Induced photon statistics in threelevel lasers". United States.
doi:10.1103/PHYSREVA.75.023815.
@article{osti_20982191,
title = {Induced photon statistics in threelevel lasers},
author = {Golubeva, T. and Golubev, Yu. and Ivanov, D. and Laser Research Institute, St. Petersburg State University, Ul'yanovskaya 5, 198504 Petrodvoretz, St. Petersburg},
abstractNote = {The statistical properties of light emitted by a threelevel laser are theoretically investigated. In the model considered the threelevel medium is coherently excited by another laser having arbitrary photon statistics. It is shown that under certain conditions the photon statistics of the threelevel laser is determined by that of the exciting laser. This feature is referred to as induced photon statistics. It is proposed to use this phenomenon to analyze the statistics of a laser involved in a feedback process. Arranging an experiment in a way such that the laser of interest serves as a coherent pump for the probe threelevel laser one is able to directly observe the statistics of the feedbackcontrolled laser by simply detecting the induced photon statistics in the threelevel probe system. The analysis of the operation of such twolaser system presented demonstrates, in particular, that the feedback itself is unable to produce a nonclassical state of light which is in complete agreement with the conclusion of Wiseman and Milburn [Phys. Rev. A 49, 1350 (1994)].},
doi = {10.1103/PHYSREVA.75.023815},
journal = {Physical Review. A},
number = 2,
volume = 75,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}

We show that in a twomode, threelevel, double{lambda} system an efficient multiphoton destructive interference involving one and threephoton pumping pathways occurs, leading to a unique type of induced transparency. Unlike the conventional electromagnetically induced transparency achieved with a threestate {lambda} system, the induced transparency is critically dependent upon two distinctive relaxation processes involving the production and propagation of an internally generated field. When a twomode probe field is injected under suitable conditions, we show that the two probe pulses, after a characteristic propagation distance, evolve into a pair of temporal, amplitude, and group velocity matched pulse, traveling loss free inmore »

Twophoton and electromagneticallyinducedtransparencyassisted Doppler cooling in a threelevel cascade system
Laser cooling is theoretically investigated in a cascade threelevel scheme, where the excited state of a laserdriven transition is coupled by a second laser to a top, more stable level, as for alkalineearthmetal atoms. The second laser action modifies the atomic scattering cross section and produces temperatures lower than those reached by Doppler cooling on the lower transition. When multiphoton processes due to the second laser are relevant, an electromagneticinduced transparency modifies the absorption of the first laser, and the final temperature is controlled by the second laser parameters. When the intermediate state is only virtually excited, the dynamics ismore » 
TwoPhoton Scattering by a Driven ThreeLevel Emitter in a OneDimensional Waveguide and Electromagnetically Induced Transparency
We study correlated twophoton transport in a (quasi)onedimensional photonic waveguide coupled to a threelevel {Lambda}type emitter driven by a classical light field. Twophoton correlation is much stronger in the waveguide for a driven threelevel emitter (3LE) than a twolevel emitter. The driven 3LE waveguide shows electromagnetically induced transparency (EIT), and we investigate the scaling of EIT for one and two photons. We show that the two transmitted photons are bunched together at any distance separation when energy of the incident photons meets ''twophoton resonance'' criterion for EIT. 
Amplitude fluctuations and photon statistics of InGaAsP injection lasers
The authors experimentally show that the statistical distribution of the light output from an injection laser can be adequately described by the superposition of a coherent electric field and narrowband Gaussian noise. A technique for measuring these fluctuations in the time domain with a resolution of 120 ps is described. The results for several InGaAsP lasers show that intensity fluctuations in an injection laser are rather large, so that the probability of finding the output below 50 percent of the average power in a 120 ps time interval can be as high as 10/sup 5/.