Dispersive coherent Brillouin scattering spectroscopy

Ishijima, Ayumu; Okabe, Shinga; Sakuma, Ichiro; Nakagawa, Keiichi

doi:10.1016/j.pacs.2022.100447

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…This simplifies the setup, makes it more compact, and ensures excellent performance. A veritable paradigm shift is proposed in the article [25] . While optical sampling has traditionally been achieved by a controlled delay between the pump and probe pulses, the authors suggest keeping the pump-probe delay fixed while significantly stretching the spectral width of the probe pulses.…”

Section: Regular Articlesmentioning

confidence: 99%

Special issue introduction: Ultrafast photoacoustics

Gusev,

Audoin,

Wright

2024

Photoacoustics

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Section: Regular Articlesmentioning

confidence: 99%

Special issue introduction: Ultrafast photoacoustics

Gusev,

Audoin,

Wright

2024

Photoacoustics

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Dynamic reflectivity of an opto-acoustic three-layer transducer for picosecond ultrasonic measurements

Le Ridant,

Ponge,

Audoin

2024

AIP Advances

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We present an analysis of a three-layered structure used for both launching and detecting picosecond acoustic waves. To enhance the optical sensitivity to the acoustic disturbances, a cavity is designed, which acts as a Fabry–Perot interferometer. We use analytic modeling based on dual optical and acoustic transfer matrix formalism to analyze the coupled optical and acoustic wave propagation. Assuming a three-layer transducer made of an optical cavity sandwiched between two thin metallic layers, the model allows for mastering of the coupled optical and acoustic responses, which leads to an optimum design of the structure, and it highlights the various acoustic contributions to the reflectivity changes. The sensitivity of this three-layered structure to acoustic disturbances is compared to the numerical predictions we performed for the standard opto-acoustic transducer made of a single metallic layer.

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Depth profiling of temperature in water at a micrometer scale using time resolved Brillouin scattering

Maslah,

Audoin

2024

Journal of Applied Physics

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Picosecond ultrasonics is a technique where coherent acoustic phonons are generated with frequencies in the GHz frequency range. When optical detection is operated in a transparent medium, the interaction of these phonons with the probe pulses yields oscillations in the time domain that reveal Brillouin scattering. Their frequency is at the Brillouin frequency shift, commensurate with the phonon velocity. As the pump–probe experiments are time-resolved, changes in the Brillouin frequency with time can be attributed to changes in sound velocity with depth. As sound velocity is temperature-dependent in liquids, we show that the picosecond ultrasonics technique can be used for temperature depth profiling in liquids. In this work, the concept is proved using the pump absorption itself as a heat source and confronting measured changes in Brillouin frequency with depth with data resulting from the derivation of a 3D modeling of the temperature rise in the liquid. We demonstrate the remote depth profiling of temperature, with measured data spaced at a distance less than the optical wavelength.

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Dispersive coherent Brillouin scattering spectroscopy

Cited by 3 publications

References 49 publications

Special issue introduction: Ultrafast photoacoustics

Special issue introduction: Ultrafast photoacoustics

Dynamic reflectivity of an opto-acoustic three-layer transducer for picosecond ultrasonic measurements

Depth profiling of temperature in water at a micrometer scale using time resolved Brillouin scattering

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