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Free Electron Lasers and Other Advanced Sources of Light Scientific Research Opportunities (1994) / Chapter Skim
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3 FAR-INFRARED REGION: 1000 to 10 pm
Pages 24-31

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 24...
... Two broad band sources are conventionally used. The hot silicon carbide source used in commercial infrared spectrometers, commonly called the "glow bar," is limited to wavelengths shorter than 100 ,um by the v2 dependence of the intensity of the light, as well as by the fact that its emissivity drops at long wavelengths, reducing the intensity still further.
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From page 25...
... in France is a user facility that has begun to produce a number of scientific results. ~., ENVISIONED DEVELOPMENT OF FREE ELECTRON LASERS In contrast to FELs proposed for the ultraviolet and x-ray regions, the development of FELs for the far-infrared wavelength region poses a relatively low technological risk.
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From page 26...
... Surface Science Much has been learned about molecules and atoms adsorbed onto surfaces through the accessibility of tunable infrared sources, both coherent and incoherent, that can measure intramolecular vibrations in the infrared between 1 and 10 ,um. Fourier-transform infrared and Raman scattering have extended the range of measurement of intramolecular vibrations down to about 400 cm~~ (25 am)
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From page 27...
... There is also some interest in measuring surface and interfacial electronic properties in this region by nonlinear optical methods. There are some initial results from these types of experiments using FELs, albeit at shorter wavelengths.
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From page 28...
... , the FEL also permits both space- and time-resolved studies of similar systems via nonlinear spectroscopy in particular sum-frequency generation. Even more importantly, it would open to study new classes of problems that require probing of mode-mode interactions, relaxation pathways from deliberately prepared excited states, spatial and temporal selectivity, and inhomogeneous materials (defects, buried interfaces, artificially structured superIattices, and quantum wells)
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From page 29...
... It is also the region for probing transitions between adjacent high-lying Rydberg states of atoms and low-frequency motions in large biomolecules. There is sufficient scientific interest to efficiently use a far-infrared user facility capable of producing picosecond pulses, and the committee believes that the scientific opportunities justify the establishment of such a facility.
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From page 30...
... ~ RECOMMENDATIONS 1. A far-infrared free electron laser user facility capable of producing picosecond pulses should be established.
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From page 31...
... 1993. "CO Species from CH30H Electrochemical Decomposition on Platinum Studied by Visible-IR Sum-Frequency Generation Using CLlO Infrared Free Electron Laser," I
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Key Terms

  • electron laser
  • user facility
  • picosecond pulses
  • electron lasers
  • individual investigator

  • user facilities
  • raman scattering
  • wavelength regions
  • nonlinear optical
  • infrared sources

  • shorter wavelengths
  • fel radiation
  • using clio
  • infrared radiation
  • buried interfaces

  • experiments using
  • intramolecular vibrations
  • plasma diagnostics
  • facility capable
  • plasma physics

  • academic department
  • frequency generation
  • using fel
  • photocathode electron
  • technical requirements

  • single academic
  • tunable sources
  • producing picosecond
  • wavelength region
  • photon echoes


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