Heterodyne detection of scattered light: application to mapping and tomography of optically inhomogeneous media

Kozlov, G. G.; Zapasskiĭ, V. S.; Shapochkin, P. Yu.

doi:10.1364/ao.57.00b170

Cited by 10 publications

(5 citation statements)

References 25 publications

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“…( 4), only components Φ − 𝑖 (r ) survive. We show in Appendix that (the similar result for the case of Gaussian beam has been obtained in [39])…”

Section: Polarimetric Response Of a Single Atomsupporting

confidence: 80%

“…where 𝑘 = 𝜔/𝑐 (𝑐 is the speed of light) and P(r) ∼ 𝛿(R − r) is the complex polarization created by the atom with the radius-vector R. Solution of this equation can be obtained using Green's function of the Helmholtz operator (see, e. g., [39,44]) and has the form…”

Section: Polarimetric Response Of a Single Atommentioning

confidence: 99%

“…The fact that magnetization noise is observed in SNS as the polarization noise of the probe laser light and is caused by fluctuations of the optical susceptibility of the sample shows a similarity of the SNS and Raman spectroscopy. Thus, due to combination of the features of the EPR and Raman spectroscopy, the SNS reveals a number of unique features related to nonperturbativity of the SNS [35,36], to possibility of tuning the frequency of the probe laser light [37,38] and its spatial localization [39], to possibility of using multi-beam configurations [40,41] and some others.…”

Section: Introductionmentioning

confidence: 99%

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Raman scattering model of the spin noise

Kozlov,

Fomin,

Petrov

et al. 2021

Preprint

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The mechanism of formation of the polarimetric signal observed in the spin noise spectroscopy (SNS) is analyzed from the viewpoint of the light scattering theory. A rigorous calculation of the polarimetric signal (Faraday rotation or ellipticity) recorded in the SNS is presented in the approximation of single scattering. We show that it is most correctly to consider this noise as a result of scattering of the probe light beam by fluctuating susceptibility of the medium. Fluctuations of the gyrotropic (antisymmetric) part of the susceptibility tensor lead to appearance of the typical for the SNS Faraday rotation noise at the Larmor frequency. At the same time, fluctuations of linear anisotropy of the medium (symmetric part of the susceptibility tensor) give rise to the ellipticity noise of the probe beam spectrally localized at the double Larmor frequency. The results of the theoretical analysis well agree with the experimental data on the ellipticity noise in cesium vapor.

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“…( 4), only components Φ − 𝑖 (r ) survive. We show in Appendix that (the similar result for the case of Gaussian beam has been obtained in [39])…”

Section: Polarimetric Response Of a Single Atomsupporting

confidence: 80%

Section: Polarimetric Response Of a Single Atommentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Raman scattering model of the spin noise

Kozlov,

Fomin,

Petrov

et al. 2021

Preprint

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“…The interference between the two fields leads to amplification of the weak field. The source of the second stronger field can be the same laser source [26], a second laser beam [44], or also light scattered from reflecting interfaces of the sample [42,43].…”

Section: B "Negative" Diffracted Signals: Background Optical Fieldsmentioning

confidence: 99%

Role of scattering by surface roughness in the photoacoustic detection of hidden micro-structures

et al. 2020

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We present an experimental study in which we compare two different pump-probe setups to generate and detect high-frequency laser-induced ultrasound for the detection of gratings buried underneath optically opaque metal layers. One system is built around a high-fluence, low-repetition-rate femtosecond laser (1 kHz) and the other around a low-fluence, high-repetition-rate femtosecond laser (5.1 MHz). We find that the signal diffracted by the acoustic replica of the grating as a function of pump-probe time delay is very different for the two setups used. We attribute this difference to the presence of a constant background field due to optical scattering by interface roughness. In the low-fluence setup, the optical field diffracted by the acoustic replica is significantly weaker than the background optical field, with which it can destructively or constructively interfere. For the right phase difference between the optical fields, this can lead to a significant "amplification" of the weak field diffracted off the grating-shaped acoustic waves. For the high-fluence system, the situation is reversed because the field diffracted off the acoustic-wave-induced grating is significantly larger than the background optical field. Our measurements show that optical scattering by interface roughness must be taken into account to properly explain experiments on laser-induced ultrasound performed with high-repetition-rate laser systems and can be used to enhance signal strength.

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“…The two probe beams instead of one allow one to analyze the cross-correlations of the Faraday rotation for the two beams [186,187]. These fluctuations are the largest, when the two beams are crossed [19,188], but even if their intersection is absent, the cross-correlations can take place due to the ballistic or diffusive propagation of electrons from one place to another [134,189], see Sec. V. The measurements of this kind allow one to study the spin dynamics not only with the time resolution, but also with the spatial resolution, and to determine, for example, parameters of the spin-orbit interaction for electrons and holes in the quantum wells.…”

mentioning

confidence: 99%

Theory of optically detected spin noise in nanosystems

Smirnov,

Mantsevich,

Glazov

2020

Preprint

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Theory of spin noise in low dimensional systems and bulk semiconductors is reviewed. Spin noise is usually detected by optical means, continuously measuring the rotation angle of the polarization plane of the probe beam passing through the sample. Spin noise spectra yield rich information about the spin properties of the system including, for example, g-factors of the charge carriers, spin relaxation times, parameters of the hyperfine interaction, spin-orbit interaction constants, frequencies and widths of the optical resonances. The review describes basic models of spin noise, methods of its theoretical description, and their relation with the experimental results. We also discuss the relation between the spin noise spectroscopy, the strong and weak quantum measurements and the spin flip Raman scattering, and analyze similar effects including manifestations of the charge, current and valley polarization fluctuations in the optical response. Possible directions for further development of the spin noise spectroscopy are outlined.

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Heterodyne detection of scattered light: application to mapping and tomography of optically inhomogeneous media

Cited by 10 publications

References 25 publications

Raman scattering model of the spin noise

Raman scattering model of the spin noise

Role of scattering by surface roughness in the photoacoustic detection of hidden micro-structures

Theory of optically detected spin noise in nanosystems

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