Simultaneous extraction of photoelastic constants and strain profiles from picosecond ultrasonic echoes via spectral analysis.

Motonobu Tomoda, Osamu Matsuda, Takehiro Tachizaki, Richard Wiltshaw, Hirotsugu Ogi, Oliver B Wright

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Article in Photoacoustics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Motonobu TomodaFaculty of Science and Technology, Oita University, Oita City, Oita, 870-1192, Japan.

Osamu MatsudaDivision of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan.

Takehiro TachizakiDepartment of Physics, Graduate School of Engineering Science, Yokohama National University, Hodogaya, Yokohama, 240-8501, Japan.

Richard WiltshawGraduate School of Engineering, The University of Osaka, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan.

Hirotsugu OgiGraduate School of Engineering, The University of Osaka, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan.

Oliver B WrightGraduate School of Engineering, The University of Osaka, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan.

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6 · The paper itself

Abstract

We present an echo spectral analysis method for picosecond ultrasonics that allows simultaneous determination of the complex photoelastic constant of an opaque isotropic thin film and its acoustic strain profile directly from optical pump-probe measurements with a normally incident optical probe beam. In contrast to previous approaches, which require separate evaluation of the photoelastic constant or iterative fitting procedures, the present method yields both the photoelastic constant and the strain profile from acoustic echoes through a purely analytical treatment. The analysis makes use of both the amplitude and phase of transient optical reflectance changes induced by acoustic echoes and requires only the complex refractive index and the longitudinal sound velocity. To illustrate the method, we apply it to simulated echo waveforms for representative opaque films and show that reliable reconstruction is maintained even in the presence of refractive-index errors, background variations, random noise, and frequency-dependent ultrasonic attenuation.

Indexed as

Optical interferometryPhotoelasticPicosecond ultrasonicsStrain pulseUltrafast

Identifiers

PMID41883423

DOI10.1016/j.pacs.2026.100820

PMCPMC13010952

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.