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Thermal Lensing Spectroscopy With Picosecond Pulse Trains and a New Dual Beam Configuration

Perry, J. W. and Ryabov, E. A. and Zewail, A. H. (1982) Thermal Lensing Spectroscopy With Picosecond Pulse Trains and a New Dual Beam Configuration. Laser Chemistry, 1 (1). pp. 9-15. ISSN 0278-6273.

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In this communication, we wish to report on the use of synchronously mode-locked picosecond lasers in a pump-probe configuration for TL spectroscopy. The peak power for these picosecond lasers is very high and, of course, the fundamental of the dye laser (red beam) can be efficiently (~10%) doubled in frequency (U.V. beam) by second harmonic generation in nonlinear crystals. We use this generated U.V. beam as a probe to monitor the very weak absorption of the red beam. An arrangement [4] of the beams involving different waist positions for the pump and probe is used. This arrangement results in an enhancement of sensitivity (at least a factor of three to seven). Also, a different dependence of the signal on the cell position compared to the single beam method is obtained. Finally, we have obtained the Δν = 5 CH-stretching overtone absorption spectrum of liquid toluene with this method (see Figure 1). Suggestions are made regarding new applications of this picosecond pulse thermal lensing technique.

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Additional Information:© 1982 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (Received May 17, 1982) This work was supported by grants from the National Science Foundation (CHE8112833 and DMR8105034). We would like to thank Professor D. Kliger for his useful comments. [A.H.Z. was an] bAlfred P. Sloan Foundation Fellow and Camille & Henry Dreyfus Foundation Teacher-Scholar. Arthur Amos Noyes Laboratory of Chemical Physics Contribution No. 6648.
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Alfred P. Sloan FoundationUNSPECIFIED
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Arthur Amos Noyes Laboratory of Chemical Physics6648
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Official Citation:J. W. Perry, E. A. Ryabov, and A. H. Zewail, “Thermal Lensing Spectroscopy With Picosecond Pulse Trains and a New Dual Beam Configuration,” Laser Chemistry, vol. 1, no. 1, pp. 9-15, 1982. doi:10.1155/LC.1.9
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Deposited On:10 Dec 2007
Last Modified:02 Oct 2019 23:59

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