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Proceedings Paper

Use of optical parametric oscillator in scanning optical microscopy
Author(s): Fu-Jen Kao
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Paper Abstract

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.

Paper Details

Date Published: 21 June 2004
PDF: 8 pages
Proc. SPIE 5323, Multiphoton Microscopy in the Biomedical Sciences IV, (21 June 2004); doi: 10.1117/12.528661
Show Author Affiliations
Fu-Jen Kao, National Sun Yat-sen Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5323:
Multiphoton Microscopy in the Biomedical Sciences IV
Ammasi Periasamy; Peter T. C. So, Editor(s)

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