Nonlinear scattering in hard tissue studied with ultrashort laser pulses

Jürgen Eichler, Beop Min Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The back-scattered spectrum of ultrashort laser pulses (800 nm, 0.2 ps) was studied in human dental and other hard tissues in vitro below the ablation threshold. Frequency doubled radiation (SHG), frequency tripled radiation and two-photon fluorescence were detected. The relative yield for these processes was measured for various pulse energies. The dependence of the SHG signal on probe thickness was determined in forward and back scattering geometry. SHG is sensitive to linear polarization of the incident laser radiation. SHG in human teeth was studied in vitro showing larger signals in dentin than in cementum and enamel. In carious areas no SHG signal could be detected. Possible applications of higher harmonic radiation for diagnostics and microscopy are discussed.

Original languageEnglish
Pages (from-to)191-197
Number of pages7
JournalZeitschrift fur Medizinische Physik
Issue number3
Publication statusPublished - 2002
Externally publishedYes


  • Hard tissue
  • Laser medicine
  • Nonlinear optics
  • Teeth
  • Ultrashort laser pulses

ASJC Scopus subject areas

  • Biophysics
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging


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