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Soviet Journal of Quantum Electronics

Spectral structure of pulse superluminescence lines of gases

F. A. Korolev, Anatoly I. Odintsov, Nikolay G. Turkin, Vladimir P. Yakunin

Published Feb 28, 1975• 4 citations
Publisher

Abstract

An experimental investigation was made of the spectral structure of several superluminescence lines of Ne, Pb, and Tl excited by electric discharge pulses. These superluminescence lines were found to consist of several components. The widths of the components were governed by the reciprocal of the superluminescence pulse duration. A reduction in this duration, observed when the gas pressure was increased, resulted in characteristic changes in the spectra. The observed structure was attributed to a fluctuation (random) spectrum which became regular in the process of propagation of a signal across a nonlinearly amplifying medium.

DOI
10.1070/qe1975v005n02abeh010929

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An experimental investigation was made of the spectral structure of several superluminescence lines of Ne, Pb, and Tl excited by electric discharge pulses. These superluminescence lines were found to consist of several components. The widths of the components were governed by the reciprocal of the superluminescence pulse duration. A reduction in this duration, observed when the gas pressure was increased, resulted in characteristic changes in the spectra. The observed structure was attributed to a fluctuation (random) spectrum which became regular in the process of propagation of a signal across a nonlinearly amplifying medium.
The interaction of polychromatic radiation of a dye laser with a neon gas-discharge plasma in shielded cylindrical tubes at medium gas pressures (1-30 Torr) near atomic spectral absorption lines of NeI atoms with wavelengths 650.6 and 656.2 nm was experimentally studied. Along the direction of propagation of the laser radiation, a shift in the central frequency of absorption is observed in the presence of inhomogeneities in the plasma column. The character of the optical transmission spectrum near narrow resonances was empirically shown to substantially depend on the density of absorbing atoms in a plasma; if this density exceeds 1012 cm-3, the contour of the transmission spectrum near the absorption resonance acquires a dispersive form. The general laws of the formation of nonstationary plasma transmission spectra depending on the laser power, the density of absorbing atoms, the nature of plasma inhomogeneities along the direction of propagation of laser radiation are examined in detail. The role of nonlinear and coherent effects and phase self-modulation during resonant interaction of short pulses of polychromatic laser radiation with gas-discharge plasma in narrow shielded tubes is discussed.
An investigation was made of the spectral composition of the spontaneous radiation, superradiance, and laser radiation emitted by a pulsed copper vapor laser. The time resolution was about 3 nsec. It was found that the observed spectral structure of the laser radiation and superradiance was governed by the hyperfine and isotopic splitting of the active levels of the copper atom. In the absence of saturation of the active medium a narrowing of the spectral line profiles was observed during a superradiance pulse. When saturation was achieved for superradiance and lasing, the line profiles broadened to the width of the spontaneous emission line during a radiation pulse. It was found that the temperature of the gas in the copper vapor laser did not exceed 2500°K.
Abstract— A comparative analysis has been made of the superluminescence spectra of two HPHT diamond samples with NV¯-centers with the concentration in the growth sectors {111} of NV¯-centers ≈10 ppm and of C-centers ≈ 45 ppm. A broad structureless superluminescence band with a maximum about 706 nm and a narrow band in the region of 705 to 720 nm were identified in the spectral range of 650–750 nm when excited by pulsed laser radiation at λ = 532 nm. It was found that the narrow-band superluminescence was not excited by pumping with continuous radiation at λ = 532 nm and the intensities of both types of superluminescence were summated under simultaneous pumping by continuous and pulsed radiation at λ = 532 nm. These data indicate either the different nature of the two types of superluminescence or that they belonged to NV¯ centers but with different excitation mechanisms. The existence of connection between the shape of the spectra of narrow-band superluminescence and of radiation pulses has been demonstrated. The observed features of narrow-band superluminescence are explained for the first time by the occurrence of mode-locking laser generation. The mode-locking laser generation without the use of reflective coatings on the sample or an external resonator on other laser materials has not been observed before.
An investigation was made of the properties of a two-component semiconductor (GaAs) medium and, specifically, of its transmission characteristics. It was found that the absorption coefficient was a nonlinear function of the power entering the medium. The "bleaching" theshold was determined. The spectral characteristics of the emission of a GaAs laser and of a GaAs amplifier–absorber system were determined. An experimental study was made of the reduction of the duration of the pulses transmitted by the amplifier–absorber system. Under traveling-wave conditions, the light pulses were compressed by a factor of up to 3 (down to 1 nsec). The experimental results were in agreement with the theoretical calculations.
A theoretical and experimental investigation is reported of the formation of the spatial coherence of superluminescence in dispersive media. The theory is developed in the axial approximation for a given amplitude of a traveling population-inversion pulse. Asymptotic coherence characteristics are obtained for certain important limiting cases. The results are given of an experimental investigation of the spatial coherence of a superluminescent dye laser excited by single picosecond pulses. An analysis is made of the possibility of obtaining short-wavelength superluminescence radiation with a high degree of spatial coherence.
Abstract We report an investigation of spectral and temporal properties of NV¯ centers in diamond plates fabricated from a single HPHT crystal but subjected to different electron irradiation doses during postgrowth processing. Samples 52734-1 and 52734-2, each with approximately the same nitrogen concentration of 60 ppm, are irradiated with doses of 1 and 2 × 1018 e‒/cm2, respectively. Particular attention is paid to the effect of irradiation dose on the concentration of NV¯ centers and the associated changes in the spectral and temporal properties of superluminescence under identical conditions of optical excitation with laser radiation at a wavelength of 532 nm. Analysis of the absorption spectra reveals that doubling the irradiation dose results in a 1.4-fold increase in the concentration of NV¯ centers—from 7.7 to 10.9 ppm—with a corresponding decrease in the concentration of isolated nitrogen centers (C centers)—from 49 to 43 ppm. The results demonstrate a nonlinear dependence of the increase in the concentration of NV¯ centers on the irradiation dose and make it possible to identify key characteristics of the samples and pumping conditions that determine the efficiency of superluminescence. Specifically, doubling the irradiation dose results in a threefold increase in the spectral intensity and a significant decrease in the duration of the superluminescence pulses. It is found that to achieve efficient superluminescence, it is important not only to have a significant excess of the concentration of C centers over the concentration of NV¯ centers, but also the absolute concentration of NV¯ centers and pump parameters such as the energy density of the pump pulses and the volume of the sample with a population inversion.