Depth profiling of absorbing soft materials using photoacoustic methods

John A. Viator, Steven L. Jacques, Scott A. Prahl

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


A Q-switched, frequency doubled, Nd:YAG laser coupled to an optical parametric oscillator generated 4.75-ns laser pulses at 726 nm to create subsurface acoustic waves in India ink solutions, India ink acrylamide gels, and in flat segments of elastin biomaterial stained with India ink. The acoustic waves traveled through the target and were detected by a piezoelectric transducer. The waveforms were converted to measurements of initial laser induced pressure and temperature as functions of depth in the material. An algorithm based on Beer's Law was developed and applied to the acoustic signals to extract information about the absorption coefficient as a function of depth in the samples.

Original languageEnglish (US)
Pages (from-to)989-996
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number4
StatePublished - Jul 1999

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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