Phasing of Stokes radiation under shock excitation of stimulated Brillouin scattering

Gordeev, A. A.; Efimkov, V F; Zubarev, I G; Михайлов, С И

doi:10.1070/qe2011v041n11abeh014697

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Dependence of the peak backscattered signal intensity on the pump peak intensity is shown in Figure 7 . One can find it close to linear from the very threshold, as such the linear dependence is characteristic for the lasing [ 22 ], rather than the conventional stimulated temperature scattering effect [ 8 ]. In our experiment, we found that the conversion efficiency, i.e., the slope of this dependence, varies from ~0.3 up to 0.7 growing with the concentration of Ag nanoparticles in suspension that varied from 0.003to 0.01 M.…”

Section: Resultsmentioning

confidence: 99%

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Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths

et al. 2022

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Recent discoveries in nonlinear optical properties of nanoparticle colloids make actual the challenge to lower the energy threshold of phase conjugation and move it into the domain of shorter pulse widths. A novel effect of the stimulated Rayleigh-Mie scattering (SRMS) in two-photon absorbing nanocolloids is considered as a promising answer to this challenge. We report the results of experimental and theoretical study of the two-photon-assisted SRMS in Ag and ZnO nanocolloids in the nanosecond-to-picosecond pulse width domain. For 12 ns 0.527 μm laser pulses, the four-wave mixing SRMS scheme provides lasing and amplification of backscattered anti-Stokes signal in Ag nanocolloids in toluene at the threshold 0.2 mJ and the spectral shifts up to 150 MHz. For 100 ps 0.532 μm pulses, we observed for the first time efficient (over 50% in signal-to-pump ratio of pulse energies) SRMS backscattering of the anti-Stokes signal in Ag nanocolloids in toluene and predominantly Stokes signal in ZnO nanocolloids in water, with the spectral shifts up to 0.25 cm−1. We develop the first order-in-perturbation model of the four-wave mixing two-photon absorption-assisted SRMS process which shows that at nanosecond pulses, amplification is predominantly due to the thermal-induced coherent oscillations of polarization while the slow temperature wave acts also as a dynamic spatial grating which provides a self-induced optical cavity inside the interaction region. At a picosecond pulse width, according to our model, the spectral overlap between pump and signal pulses results in formation of only the dynamic spatial temperature grating, and we succeeded at recovering the linear growth of the spectral shift with the pump power near the threshold.

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Section: Resultsmentioning

confidence: 99%

“…Semi-circles of the pump and the backscattered signal interferometric patterns were simultaneously projected onto a CCD. The digital image was processed with the use of the mathematical procedure described in [ 22 ], which allows us to extract the spectral information and resolve spectral shifts as small as ~20 MHz.…”

Section: Methodsmentioning

confidence: 99%

Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths

et al. 2022

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“…The slope of this linear dependence, which is in fact the conversion efficiency (peak-to-peak ratio of intensities), varies from ∼0.3 up to 0.7 depending on the Ag NP concentration (0.003 M-0.01 M). We have to note that this feature of emission is more natural for lasing [15] than for the conventional stimulated scattering effect [1]. The dependence of the STS spectral shift on the pump pulse energy is shown in figure 4(b).…”

Section: Introductionmentioning

confidence: 99%

Frequency up-shift in the stimulated thermal scattering under two-photon absorption in liquids and colloids of metal nanoparticles

Smetanin¹,

Ерохин

Baranov

2018

Laser Phys.

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We report the results of the experimental and theoretical study of stimulated temperature scattering in toluene and hexane solutions of Ag-nanoparticles, as well as in pure toluene in the two-photon absorption regime. A four-wave mixing scheme with two counter-propagating pump waves of the same frequency is utilised to demonstrate the lasing effect and the amplification of the backscattered anti-Stokes signal. For the first time, we have measured anti-Stokes spectral shifts which turn out to appreciably exceed the Rayleigh line widths in those liquids. It is shown that the amplification effect is provided predominantly by thermally induced coherent polarisation oscillations, while the dynamic interference temperature grating causes the formation of a self-induced optical cavity inside the interaction region.

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Stabilization of a phase of conjugated wave at SBS with feedback on standing phase gratings

Galushkin

Mitin²

2017

Optics Communications

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Phasing of Stokes radiation under shock excitation of stimulated Brillouin scattering

Cited by 7 publications

References 5 publications

Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths

Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths

Frequency up-shift in the stimulated thermal scattering under two-photon absorption in liquids and colloids of metal nanoparticles

Stabilization of a phase of conjugated wave at SBS with feedback on standing phase gratings

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