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Summary form only given. Single crystals of the polydiacetylene, poly[2,4-hexadiyne-1,6-diol-bis(p-toluenesulfonate)] (pTS) have been studied in the near resonant regime by transient absorption spectroscopy. We show the changes observed in the absorption spectra at short times surrounding the arrival of the 726-nm laser pulse. The experiment is performed by monitoring the transmission of a continuum...
Summary form only given. When a quantum-well exciton transition is resonant with a single mode of a high-Q microcavity, the normal modes ("cavity polaritons") of the coupled system are equal admixtures of the exciton and cavity. We have previously shown that, if the lower normal mode is excited by a phase-locked pair of optical pulses, the nonlinear response of a probe pulse tuned to the...
Summary form only given. Infrared-visible sum-frequency generation (SFG) has been proven to be a powerful probe for vibrational spectroscopic investigation of surfaces and interfaces. It is highly surface specific and has a submonolayer sensitivity. As a nonlinear optical process, SFG puts a premium on high input beam intensities. One would therefore like to employ input pulses as short as possible...
Summary form only given. We use visible-infrared dual beam time-resolved spectroscopy to study the dynamics of carriers in optically pumped laser devices containing quantum heterostructures within their active layers. By tuning the probe energy through the intersubband absorption resonance, we directly measure the electron population in various momentum states within the first conduction subband of...
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