Use of optical parametric oscillator in scanning optical microscopy

Fu Jen Kao*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Ultrafast lasers have found increasing use in scanning optical microscopy due to their very high peak power in generating multiphoton excitations. A mode-locked Ti:sapphire laser is often employed for such purposes. Together with a synchronously pumped optical parametric oscillator (OPO), the spectral range available can be extended to 1050-1300 nm. This broader range available greatly facilitates the excitation of second harmonic generation (SHG) and third harmonic generation (THG) due to better satisfaction of phase matching condition that is achieved with a longer excitation wavelength. Dental sections are then investigated with the contrasts from harmonic generation. In addition, through intra-cavity doubling wavelengths from 525-650 nm are made available for effective two-photon (2-p) excitation with the equivalent photon energy in the UVB range (290-320 nm) and beyond. This new capacity allows UV (auto-) fluorescence excitation and imaging, for example, from some amino acids, such as tyrosine, tryptophan, and glycine.

Original languageEnglish
Pages (from-to)252-259
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2004
EventProgress in Biomedical Optics and Imaging - Multiphoton Microscopy in the Biomedical Sciences IV - San Jose, CA, United States
Duration: 25 Jan 200427 Jan 2004


  • Intra-cavity doubling
  • Laser scanning microscopy
  • Optical parametric oscillator
  • Second harmonic generation
  • Third harmonic generation
  • Two-photon excitation
  • Ultraviolet


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