Abstract
Photoacoustic detection methods and tunable laser-induced grating techniques can both provide useful new measurement capabilities for studying ultrafast physical and chemical processes and lifetimes. The photoacoustic technique, which measures the total acoustic impulse produced by two variable-delay picosecond pulses in an absorbing sample, provides a sensitive and effective technique for measuring the absolute cross sections and lifetimes of weakly absorbing excited states, with time resolution limited only by the optical pulsewidths. The transient grating techniques, which measure the probe beam diffraction from the moving excited- state gratings induced in a sample by two dye laser beams with a tunable difference frequency, provide an effective method for measuring picosecond and subpicosecond physical phenomena through measurements made in the frequency domain. Tunable transient grating measurements on organic dyes using both two-laser and three-laser methods will be described.
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This material comes largely from a Ph.D. dissertation by Jean-Marc Heritier, Picosecond, Spectroscopy Using a Photo-acoustic Detector, Ph.D. dissertation submitted to the Department of Applied Physics, Stanford University, March 1983; plus additional references given below.
This material comes largely from a Ph.D. dissertation by Rick Trebino, Subpicosecond-Relaxation Studies using Tunable-Laser-Induced-Grating Techniques, Ph.D. dissertation submitted to the Department of Applied Physics, Stanford University, May 1983; plus additional references given below.
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Siegman, A.E. (1984). Alternative Techniques For Picosecond Spectroscopy. In: Eisenthal, K.B. (eds) Applications of Picosecond Spectroscopy to Chemistry. NATO ASI Series, vol 127. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6427-3_19
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DOI: https://doi.org/10.1007/978-94-009-6427-3_19
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