Novel device for increasing the laser pulse intensity in multiphoton ionization mass spectrometry

Dawei Liang; Luis Fraser Monteiro; M. L. Fraser Monteiro

doi:10.1117/12.46869

1 October 1991 Novel device for increasing the laser pulse intensity in multiphoton ionization mass spectrometry

Dawei Liang, Luis Fraser Monteiro, M. L. Fraser Monteiro

Proceedings Volume 1501, Advanced Laser Concepts and Applications; (1991) https://doi.org/10.1117/12.46869
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

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.

Citation Download Citation

Dawei Liang, Luis Fraser Monteiro, and M. L. Fraser Monteiro "Novel device for increasing the laser pulse intensity in multiphoton ionization mass spectrometry", Proc. SPIE 1501, Advanced Laser Concepts and Applications, (1 October 1991); https://doi.org/10.1117/12.46869

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