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@ARTICLE{Wunderle:3009,
      author       = {Wunderle, K. and Wagner, S. and Pasti, I. and Pieruschka,
                      R. and Rascher, U. and Schurr, U. and Ebert, V.},
      title        = {{D}istributed feedback diode laser spectrometer at 2,7 µm
                      for sensitive, spatially resolved {H}2{O} vapor detection},
      journal      = {Applied optics},
      volume       = {48},
      issn         = {0003-6935},
      address      = {Washington, DC},
      publisher    = {Optical Soc. of America},
      reportid     = {PreJuSER-3009},
      pages        = {B172 - B182},
      year         = {2009},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {A new, compact, spatially scanning, open-path 2.7 mu m
                      tunable diode laser absorption spectrometer with short
                      absorption path lengths below 10cm was developed to analyze
                      the spatiotemporal dynamics of one-dimensional (1D) spatial
                      water vapor gradients. This spectrometer, which is based on
                      a room-temperature distributed feedback diode laser, is
                      capable of measuring absolute, calibration-free,
                      line-of-sight averaged, but laterally resolved 1D H2O
                      concentration profiles with a minimum fractional optical
                      resolution of 2.1 x 10(-3) optical density (OD) (2.5 x
                      10(-4) OD after a background subtraction procedure), which
                      permits a signal-to-noise-ratio of 407 (3400) at 10, 000
                      parts in 10(6) (ppm) H2O, or normalized sensitivities of 2.6
                      ppm(.)m (0.32 ppm m) at 0.5 Hz duty cycle. The
                      spectrometer's lateral spatial resolution (governed by the
                      500 mu m sampling beam diameter) was validated by analyzing
                      a well-defined laminar jet of nitrogen gas in humidified
                      air. This scanning setup was then used to (a) quantitatively
                      investigate for what we believe to be the first time the H2O
                      boundary layer from 0.7 to 11 mm beneath the stomatous side
                      of a single, undetached plant leaf, and (b) to study the
                      temporal boundary layer dynamics and its dependence on
                      stepwise light stimulation of the photosynthetic system. In
                      addition the 2.7 mu m diode laser was carefully
                      characterized in terms of spectral purity, beam profile, as
                      well as quasi-static and dynamic wavelength tuning
                      coefficients. (C) 2009 Optical Society of America},
      keywords     = {J (WoSType)},
      cin          = {ICG-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Optics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000264413400023},
      doi          = {10.1364/AO.48.00B172},
      url          = {https://juser.fz-juelich.de/record/3009},
}