Boundary Condition Effect On Photoacoustic Response Of Absorbing Liquid To Modulation Of Laser Intensity

Authors

  • A.A. Samokhin A.M. Prokhorov General Physics Institute of Russian Academy of Sciences, 38, Vavilov str., Moscow, 119991, Russian Federation
  • N.N. Il’ichev A.M. Prokhorov General Physics Institute of Russian Academy of Sciences, 38, Vavilov str., Moscow, 119991, Russian Federation
  • A.Yu. Ivochkin A.M. Prokhorov General Physics Institute of Russian Academy of Sciences, 38, Vavilov str., Moscow, 119991, Russian Federation
  • E.S. Gulyamova A.M. Prokhorov General Physics Institute of Russian Academy of Sciences, 38, Vavilov str., Moscow, 119991, Russian Federation

DOI:

https://doi.org/10.12684/alt.1.91

Abstract

The  photoacoustic  (PA)  pressure  response  of  the absorbing  liquid  (water, ethanol)  with  free  and confined  surface  to  laser  pulse  with  modulated intensity is studied.  Modulation  amplitude  of  the PA  signal  demonstrates  non-monotonous behavior during laser pulse action which can be explained as interference  between thermo-acoustic  and vaporization  mechanisms  of  pressure  generation. The phase behavior of modulated part of PA signal also  gives  important  information  on processes  in the  irradiated  matter.  Doppler  photoacoustic monitoring  (DPM)  is used  to  determine  surface movement  during  laser  irradiation  (wavelength  – 2.94 um,  pulse  duration  ~  200-300  ns,  fluence  ~ 0.3-1.6  J/cm2).  In  the  case  of free  surface  this movement  is  possible  into  the  upward  and downward  directions while  for  the  constrained irradiated surface only one movement is supposed. This supposition  is  in  agreement  with  the experiment.  However  the  total  behavior  of PA response  is  more  complicated  due  to  probably vapor  cavity  formation between liquid  and  solid surfaces.  In  particular,  despite  the  imposed constraint PA response behavior resembles the free surface case.
ALT 12 Conference, Gwatt, Sept. 2 -6, Switzerland

Downloads

Published

2012-11-01

How to Cite

Samokhin, A., Il’ichev, N., Ivochkin, A., & Gulyamova, E. (2012). Boundary Condition Effect On Photoacoustic Response Of Absorbing Liquid To Modulation Of Laser Intensity. ALT Proceedings, 1. https://doi.org/10.12684/alt.1.91

Issue

Vol. 1 (2012)

Section

Photoacoustics

License

Authors who publish with this journal agree to the following terms:

    1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under the Creative Commons Attribution License (CC BY 3.0) that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.

 

    1. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.

 

  1. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).

http://creativecommons.org/licenses/by/3.0/