Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Soviet Journal of Quantum Electronics

Influence of superfluorescence on the operation of lasers with dye amplifiers

N M Narovlyanskaya, Eugene A. Tikhonov

Published Feb 28, 1978• 2 citations
Publisher

Abstract

An investigation was made of a longitudinally pumped laser-single-pass dye amplifier system with a view to optimizing the total conversion efficiency. It was shown that competition between two processes–amplification of the external signal and of the spontaneous noise–determines the total efficiency of conversion of the pump into useful signal. The superfluorescence restricts the maximum gain and conversion efficiency of small external signals, as does the saturation by the signal being amplified in the case of large external signals. A quantitative analysis was made of the choice of optimal optical density of the amplifier and of the competition between two coupled waves in a nonlinearly amplifying medium.

DOI
10.1070/qe1978v008n02abeh008471

Related papers

Superfluorescence in semiconductor lasers

Petr P Vasil'ev

An analysis is made of the conditions for the generation of superfluorescence pulses in an inverted medium of electron—hole pairs in a semiconductor. It is shown that strong optical amplification in laser semiconductor amplifiers characterised by α L ≫ 1 (α is the small-signal gain and L is the amplifier length) leads to suppression of phase relaxation of the medium during the initial stages of evolution of superfluorescence and to formation of a macroscopic dipole from electron—hole pairs. Cooperative emission of radiation in this system results in generation of a powerful ultrashort pulse of the optical gain, which interacts coherently with the semiconductor medium. It is shown that coherent pulsations of the optical field, observed earlier by the author in Q -switched semiconductor lasers, are the result of superfluorescence and of the coherent interaction between the optical field and the medium.

Quantum Electronics•Oct 31, 1997•13 citations

Amplitude-spectral asymmetry of stimulated emission from dye solutions

V. I. Bezrodnyi, N M Narovlyanskaya, Eugene A. Tikhonov

A report is given of a study of the amplitude-spectral asymmetry of the stimulated emission of superfluorescence from dye solutions pumped longitudinally by nanosecond laser pulses. This amplitude asymmetry is manifested by the difference between the powers of the forward and backward waves, and it is a function of the rate of pumping and of the optical density of the active medium. The asymmetry of stimulated emission from a ring laser is manifested by the appearance of a wave with a traveling-wave ratio of ~90 in the absence of any optical isolators. The spectral asymmetry of a ring laser is manifested by a difference between the spectra of strong and weak waves traveling in opposite directions. A quantitative analysis is made of the effects based on the solution of the transfer equations for radiation traveling in a nonlinearly absorbing active medium.

Soviet Journal of Quantum Electronics•Feb 28, 1978•0 citations

Transition between amplified spontaneous emission and superfluorescence in a longitudinally pumped medium by an x-ray free-electron-laser pulse

Yu-Hung Kuan, Wen-Te Liao

The transition from the amplification of spontaneous emission to superfluorescence in a three-level and swept-gain medium excited by an x-ray free-electron-laser pulse is theoretically investigated. Given the specific timescale of an x-ray free-electron-laser pulse, we investigate the swept pumping process in detail, and our results show that the temporal structure of an x-ray free-electron-laser pulse plays a more critical role than its peak intensity does for producing population inversion. The typical watershed of two radiant regions depends on the optical depth of the gain medium for a given coherence time, namely, the particle number density and medium length are equally important. However, we find that medium length plays a more important role than particle density for making the forward-backward asymmetry. The transient gain length and the total medium length are identified as two important factors to observe length-induced backward transition. The present results suggest an application of parametric controls over a single-pass-amplified light source.

arXiv:1911.00450•Physical Review A•Feb 24, 2020•7 citations

Amplification of spontaneous emission and gain measurement in dye amplifiers

Thomas Efthimiopoulos, Brian K. Garside

A comparison is reported of the observed spectral narrowing of amplified spontaneous emission from dye amplifiers with predictions from a dynamical model based on rate equations. This is employed to develop a generally applicable method of determining the unsaturated gain within the dye medium. Comparison is made with another technique for determining gain over the restricted pumping range for which it is applicable. The matching of theory to experiment is sufficiently sensitive that good values can also be determined for the wavelength dependence of the excited singlet state absorption cross section.

Canadian Journal of Physics•Jun 1, 1981•6 citations

Analysis of a single-mode evanescent-field-pumped dye amplifier

Walter J. Hodel, P. Anliker, Hans G. Weber

Amplification of a light signal propagating in a single-mode fiber of passive core and active cladding (dye solution) is investigated. The active cladding region is excited by the evanescent field of a pump mode. Calculations are based on exact field expressions (weakly guiding case) and rate equations for the dye under steady-state conditions. Assuming the 'slow growth approximation' to be valid, two coupled nonlinear differential equations are derived for the powers in pump and signal modes, respectively. The influence of various fiber and dye parameters on the gain is studied. It is concluded that CW single-pass amplification by factors of up to five seem realistically achievable.

Journal of Lightwave Technology•Sep 1, 1983•1 citation

Amplified spontaneous emission in spherical and disk-shaped laser media

Amos A. Hardy, D. Treves

Amplified spontaneous emission of laser media having a spherical or disk shape is numerically analyzed. Some properties are discussed and a comparison with linear systems is made. Analytical approximations, for the case of high pumping rates and high efficiency, are obtained. Energy level schemes of dye systems are used in the analysis and in the numerical calculations. A coupled set of radiative transfer and rate equations is solved under quasi-steady-state conditions. The model takes into account the fluorescence spectrum and gain saturation effects with radially symmetric distributions of the active dye molecular densities. As a comparison, the numerical examples also include an H2O system which is relevant in astrophysics.

IEEE Journal of Quantum Electronics•Sep 1, 1979•10 citations
An investigation was made of a longitudinally pumped laser-single-pass dye amplifier system with a view to optimizing the total conversion efficiency. It was shown that competition between two processes–amplification of the external signal and of the spontaneous noise–determines the total efficiency of conversion of the pump into useful signal. The superfluorescence restricts the maximum gain and conversion efficiency of small external signals, as does the saturation by the signal being amplified in the case of large external signals. A quantitative analysis was made of the choice of optimal optical density of the amplifier and of the competition between two coupled waves in a nonlinearly amplifying medium.
An analysis is made of the conditions for the generation of superfluorescence pulses in an inverted medium of electron—hole pairs in a semiconductor. It is shown that strong optical amplification in laser semiconductor amplifiers characterised by α L ≫ 1 (α is the small-signal gain and L is the amplifier length) leads to suppression of phase relaxation of the medium during the initial stages of evolution of superfluorescence and to formation of a macroscopic dipole from electron—hole pairs. Cooperative emission of radiation in this system results in generation of a powerful ultrashort pulse of the optical gain, which interacts coherently with the semiconductor medium. It is shown that coherent pulsations of the optical field, observed earlier by the author in Q -switched semiconductor lasers, are the result of superfluorescence and of the coherent interaction between the optical field and the medium.
A report is given of a study of the amplitude-spectral asymmetry of the stimulated emission of superfluorescence from dye solutions pumped longitudinally by nanosecond laser pulses. This amplitude asymmetry is manifested by the difference between the powers of the forward and backward waves, and it is a function of the rate of pumping and of the optical density of the active medium. The asymmetry of stimulated emission from a ring laser is manifested by the appearance of a wave with a traveling-wave ratio of ~90 in the absence of any optical isolators. The spectral asymmetry of a ring laser is manifested by a difference between the spectra of strong and weak waves traveling in opposite directions. A quantitative analysis is made of the effects based on the solution of the transfer equations for radiation traveling in a nonlinearly absorbing active medium.
The transition from the amplification of spontaneous emission to superfluorescence in a three-level and swept-gain medium excited by an x-ray free-electron-laser pulse is theoretically investigated. Given the specific timescale of an x-ray free-electron-laser pulse, we investigate the swept pumping process in detail, and our results show that the temporal structure of an x-ray free-electron-laser pulse plays a more critical role than its peak intensity does for producing population inversion. The typical watershed of two radiant regions depends on the optical depth of the gain medium for a given coherence time, namely, the particle number density and medium length are equally important. However, we find that medium length plays a more important role than particle density for making the forward-backward asymmetry. The transient gain length and the total medium length are identified as two important factors to observe length-induced backward transition. The present results suggest an application of parametric controls over a single-pass-amplified light source.
A comparison is reported of the observed spectral narrowing of amplified spontaneous emission from dye amplifiers with predictions from a dynamical model based on rate equations. This is employed to develop a generally applicable method of determining the unsaturated gain within the dye medium. Comparison is made with another technique for determining gain over the restricted pumping range for which it is applicable. The matching of theory to experiment is sufficiently sensitive that good values can also be determined for the wavelength dependence of the excited singlet state absorption cross section.
Amplification of a light signal propagating in a single-mode fiber of passive core and active cladding (dye solution) is investigated. The active cladding region is excited by the evanescent field of a pump mode. Calculations are based on exact field expressions (weakly guiding case) and rate equations for the dye under steady-state conditions. Assuming the 'slow growth approximation' to be valid, two coupled nonlinear differential equations are derived for the powers in pump and signal modes, respectively. The influence of various fiber and dye parameters on the gain is studied. It is concluded that CW single-pass amplification by factors of up to five seem realistically achievable.
Amplified spontaneous emission of laser media having a spherical or disk shape is numerically analyzed. Some properties are discussed and a comparison with linear systems is made. Analytical approximations, for the case of high pumping rates and high efficiency, are obtained. Energy level schemes of dye systems are used in the analysis and in the numerical calculations. A coupled set of radiative transfer and rate equations is solved under quasi-steady-state conditions. The model takes into account the fluorescence spectrum and gain saturation effects with radially symmetric distributions of the active dye molecular densities. As a comparison, the numerical examples also include an H2O system which is relevant in astrophysics.