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Proceedings Paper

Novel device for increasing the laser pulse intensity in multiphoton ionization mass spectrometry
Author(s): Dawei Liang; Luis Fraser Monteiro; M. L. Fraser Monteiro
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Paper Abstract

In multiphoton ionization mass spectrometry, the increase in laser pulse intensity leads to an additional absorption of photons by molecules, and the degree of fragmentation also increases significantly. A laser pulse is usually focused to interact with the molecular beam only once, and the laser power is then wasted. A novel device for increasing the laser pulse intensity in a multiphoton ionization mass spectrometer is put forward. By collecting and refocusing the laser pulse precisely onto the laser-molecules interaction region, the laser pulse intensity in this region is increased. By using two UV reflectors and a lens, the 0.3 ns delayed laser pulse is guided back to superimpose almost simultaneously onto the original pulse. UV optical fiber is used to guide the residual laser pulse out from the vacuum chamber. The accurate interaction between light pulses and molecules is obtained by monitoring this output laser pulse intensity. By using this device, the mass spectrum of benzene was produced, which showed a stronger fragmentation than was obtained with the usual method at the same laser power. This laser intensity enhancement device is of practical importance to applications where a strong local laser field is needed.

Paper Details

Date Published: 1 October 1991
PDF: 6 pages
Proc. SPIE 1501, Advanced Laser Concepts and Applications, (1 October 1991); doi: 10.1117/12.46869
Show Author Affiliations
Dawei Liang, Univ. de Lisboa (Portugal)
Luis Fraser Monteiro, Univ. de Lisboa (Portugal)
M. L. Fraser Monteiro, Univ. de Lisboa (Portugal)

Published in SPIE Proceedings Vol. 1501:
Advanced Laser Concepts and Applications
Sidney Singer, Editor(s)

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