Optical dephasing of a near infrared dye in PMMA: photon echoes using the superconducting accelerator pumped free electron laser
✍ Scribed by S.R. Greenfield; Y.S. Bai; M.D. Fayer
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 455 KB
- Volume
- 170
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
A superconducting accelerator pumped free electron laser is used to perform picosecond photon echo experiments on the near mfrared dye 1,1',3.3,3',3'-hexamethylindotricarbocyanine iodide (HITCI) m poly(methy1 methacrylate) (PMMA). The temperature dependence ofthe optical dephasing is measured from 1.5 to 10 K. At the lowest temperatures a temperature dependence, T1.4, characteristic of two-level system glass dynamics is observed. Above 5 K, the optical dephasing is exponentially activated with an activation energy of 15 cm-'. This is the same activation energy reported for rhodamine B in PMMA, demonstrating that 15 cm-' corresponds to an intrinsic glass mode. These are the first photon echo experiments, and to our knowledge, the first nonlinear optical coherence experiments, performed using a FEL as a source.