Interferometry-free noncontact photoacoustic detection method based on speckle correlation change

Huanhao Li, Fei Cao, Yingying Zhou, Zhipeng Yu, Puxiang Lai (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


Optical speckle patterns occur when a coherent optical wavefront is randomized but such stochastic yet deterministic information about the medium can be decoded. A simple setup is inspired to monitor the decorrelation of speckle patterns within the memory effect range when the medium is photoacoustically perturbated. Experimentally, a linear relationship is confirmed between the speckle correlation change and the peak-to-peak amplitude of the ultrasonic transducer-detected photoacoustic waves, and the detection sensitivity is comparable. Such a plain specklegram-based method may find special interests when no direct contact is allowed between the sample and the photoacoustic detector.

Original languageEnglish
Pages (from-to)5481-5484
Number of pages4
JournalOptics Letters
Issue number22
Publication statusPublished - 15 Nov 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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