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Brillouin scattering

About: Brillouin scattering is a research topic. Over the lifetime, 11426 publications have been published within this topic receiving 178306 citations.


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Journal ArticleDOI
TL;DR: In this paper, the Brillouin spectra of the ferroelectric triglycine sulfate (TGS) and its isomorphous selenate (TGSe) crystals have been observed in three cases of orientations of the longitudinal or quasi-longitudinal phonon vector q ; (1) q // c -axis, q // b -axis and q deviates 5° from b-axis in the (100) plane.
Abstract: The Brillouin spectra of the ferroelectric triglycine sulfate (TGS) and its isomorphous selenate (TGSe) crystals have been observed in three cases of orientations of the longitudinal or quasi-longitudinal phonon vector q ; (1) q // c -axis, (2) q // b -axis and (3) q deviates 5° from b -axis in the (100) plane. The temperature dependence of both the frequency shift and the spectral width shows a remarkable anisotropy near T c . In the case (1) the temperature at which the width becomes maximum shifts to the lower temperature than T c which has simultaneously been determined by an accompanied measurement of dielectric constant. The polarization relaxation time is determined from this temperature shift using the phenomenological relation. In the case (2) and the case (3), the decrease in the anomaly is explained as the depolarization field effect of the long range dipole-dipole interaction which is characteristic in the ferroelectric phase transition.

48 citations

Journal ArticleDOI
Shilie Zheng1, Sixuan Ge1, Xianmin Zhang1, Hao Chi1, Xiaofeng Jin1 
TL;DR: In this article, a novel multiple microwave frequency measurement scheme is proposed based on the selective conversion of phase modulation to amplitude modulation, which is realized by stimulated Brillouin scattering, and the results show that this scheme is competent in determining the frequency information among multiple frequency signal with very high resolution and accuracy.
Abstract: A novel multiple microwave frequency measurement scheme is proposed based on the selective conversion of phase modulation to amplitude modulation, which is realized by stimulated Brillouin scattering. The principle of this scheme is theoretically elucidated with its advantages and disadvantages discussed. Experiments are established to verify its feasibility and the results show that this scheme is competent in determining the frequency information among multiple frequency signal with very high resolution and accuracy. The maximum measurement error is less than 30 MHz.

48 citations

Journal ArticleDOI
TL;DR: These glasses show promise for waveguide fibers for the 3-4-microm region if ultrahigh purity specimens can be prepared.
Abstract: The optical transparency and refractive index were measured over a wide wavelength range from the UV into the infrared for five glasses of potential use for long-wavelength optical fibers. The glasses contain 30–50 mole % GeO2 with the addition of Bi2O3, Tl2O, PbO, and Sb2O3. Indices were measured with a computerized refractometer to an accuracy of ±3 × 10−5 and were fitted within this accuracy to a three-term Sellmeier formula. This formula was then used to obtain interpolated index values, the dispersion, Abbe number, wavelength for zero material dispersion λ0, and slope of material dispersion vs wavelength (dM/dλ) at λ0. The temperature coefficients of the refractive index were also measured over a wide wavelength range, and the glasses were characterized by density, thermal expansion, glass transition, and crystallization temperatures. Raman and Brillouin spectra were also recorded on one of these glasses and the latter used to determine the elastic constants. The refractive indices ranged from nD = 1.93948 to nD = 2.28553, with Abbe numbers between 22.7 and 10.5. Values of λ0 were in the range from 2.08 to 2.81 μm combined with −dM/dλ values from 54.8 to 85.0 psec/nm ⋅ km ⋅ μm, significantly lower than that of fused silica (101 psec/nm ⋅ km ⋅ μm). These glasses show promise for waveguide fibers for the 3−4-μm region if ultrahigh purity specimens can be prepared.

48 citations

Journal ArticleDOI
TL;DR: In this paper, the surface wave velocities were found to be independent of superlattice wavelength over the entire range investigated, 1.5-30 nm, and were averages of the measured velocity of pure homogeneous TiN, NbN, and (V0.6Nb0.4)N super-lattices.
Abstract: Brillouin scattering measurements have been carried out on single‐crystal lattice‐matched TiN/(V0.6Nb0.4)N and mismatched TiN/NbN superlattices. Measured surface wave velocities were found to be independent of superlattice wavelength over the entire range investigated, 1.5–30 nm, and were averages of the measured velocities of pure homogeneous TiN, NbN, and (V0.6Nb0.4)N. These results indicate that there is no anomaly in the C44 elastic constant. X‐ray diffraction results from the superlattices indicated that the average lattice spacing did not vary with wavelength. This is consistent with previous observations where elastic anomalies were related to changes in lattice spacing. The absence of a correlation between the C44 elastic constant and previously reported hardness enhancements indicates that the latter are not caused by anomalies in C44; they could, however, be correlated with other elastic moduli.

48 citations

Journal ArticleDOI
TL;DR: In this paper, a multiwavelength linear-cavity Brillouin-Erbium fiber laser pumped by a 1480 nm pump laser is demonstrated to operate in the L-band region.
Abstract: In this paper, a multiwavelength linear-cavity Brillouin-Erbium fiber laser pumped by a 1480 nm pump laser is demonstrated to operate in the L-band region. The issue of low gain efficiency of L-band in Erbium-doped fiber pumped with 980 nm pump lasers is resolved with this pumping scheme. The amount of 1480 nm pump power to produce the first Brillouin Stokes line oscillating in the cavity is 23.4 mW only. The proposed laser configuration has a wide tuning range of 16 nm from 1591 to 1607 nm with six Brillouin Stokes lines within this tuning range. The maximum number of 23 Brillouin Stokes lines with a spacing of 0.089 nm is achieved by setting the Brillouin pump wavelength at 1595.5 nm and its power is set at 3.2 mW.

48 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023237
2022471
2021289
2020342
2019433
2018404