From Event: SPIE Optical Engineering + Applications, 2016
We have developed a new method, transient grating photoluminescence spectroscopy (TGPLS), allowing the collection
of broadband ultrafast photoluminescence spectroscopy with low photoluminescence background. In TGPLS, two
ultrafast laser pulses generate a multiplexed transient grating (TG) by the optical Kerr effect. The gated signal is
diffracted by the TG and spatially separated from background fluorescence. This high performance nonlinear optical gate
delivers time resolution less than 200 fs, spectral bandwidth covering the entire visible region with extremely low
fluorescence background. Here we present two applications of TGPLS that provide deeper insight into ultrafast energy
transfer in multi-chromophore perylene arrays and ultrafast structural relaxation in oligothiophenes.
Kai Chen, Joseph K. Gallaher, Shyamal K. K. Prasad, James E. A. Webb, Pall Thordarson, and Justin M. Hodgkiss, "Capturing ultrafast spectral evolution with transient grating photoluminescence spectroscopy," Proc. SPIE 9956, Ultrafast Nonlinear Imaging and Spectroscopy IV, 99560V (Presented at SPIE Optical Engineering + Applications: August 29, 2016; Published: 5 October 2016); https://doi.org/10.1117/12.2236586.
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