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Pump-probe nonlinear absorption spectroscopy of molecular aggregates using chirped frequency-shifted light pulses from a photonic-crystal fiber |
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| Authors: | A A Ivanov D A Akimov P V Mezentsev A I Plekhanov M V Alfimov A M Zheltikov |
| Institution: | (1) Center of Photochemistry, Russian Academy of Sciences, ul. Novatorov 7a, Moscow, 117421, Russia;(2) Physics Department, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(3) Institute of Automation and Electrometry, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia;(4) International Laser Center, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia |
| Abstract: | Photonic-crystal fibers provide efficient nonlinear-optical transformations of femtosecond Cr: forsterite laser pulses, delivering linearly chirped frequency-shifted broadband light pulses optimized for pump-probe nonlinear absorption spectroscopy of molecular aggregates. The blue-shifted output of a photonic-crystal fiber with a spectrum stretching from 530 to 680 nm is used to probe one-and two-exciton bands of thiacarbocyanine J aggregates in a polymer film excited by femtosecond second-harmonic pulses of the Cr: forsterite laser. |
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