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  • 1.
    Tulldahl, H. Michael
    et al.
    Swedish National Defence College.
    Steinvall, K. O.
    Analytical waveform generation from small objects in lidar bathymetry1999In: Applied Optics, ISSN 0003-6935, E-ISSN 1539-4522, Vol. 38, no 6, p. 1021-1039Article in journal (Refereed)
    Abstract [en]

    We present a model to simulate receiver waveforms from an airborne sea-depth-sounding lidar to compare the influence that is due to different shapes of objects placed on the sea bottom. The objects are of size 1 m(3), and the bottom depths are 5-12 m. We use an existing analytical beam-propagation model and divide the bottom into squares. For each element on the bottom grid we create a transmitted and a reflected waveform. The waveforms are summed, yielding a total contribution from all bottom elements. We compare two object types, cylinder and cube, and find that the difference in the receiver waveform is small between these objects. Simulated waveforms are compared with experimental data from the Swedish Hawk Eye system and show good agreement.

  • 2.
    Veszelei, Monica
    et al.
    Uppsala Universitet.
    Andersson, Kent
    Uppsala Universitet.
    Ribbing, C G
    Uppsala Universitet.
    Järrendahl, K
    Linköpings Tekniska Högskola.
    Arwin, H
    Linköpings Tekniska Högskola.
    Optical constants and Drude analysis of sputtered zirconium nitride films1994In: Applied Optics, ISSN 0003-6935, E-ISSN 1539-4522, Vol. 33, no 10, p. 1993-2001Article in journal (Refereed)
    Abstract [en]

    Opaque and semitransparent dc magnetron-sputtered ZrN films on glass and silicon have been optically characterized with spectral reflectance measurements and ellipsometry. High rate sputtered ZrN has good optical selectivity, i.e., higher than 90% infrared reflectance and a pronounced reflectance step in the visible to a reflectance minimum of less than 10% at 350 nm. The results are comparable with those obtained for single crystalline samples and those prepared by chemical vapor deposition. The complex optical constant (N = n v ik) for opaque films has been determined in the 0.23-25-µm wavelength range with Kramers-Kronig integration of bulk reflectance combined with oblique incidence reflectance for p-polarized light. A variable angle of incidence spectroscopic ellipsometer has been used for determination of the optical constants in the 0.28-1.0-µm wavelength region. The results of the two methods show excellent agreement. The results indicate that ZrN is free electronlike and the Drude model can be applied. The best opaque films had Drude plasma energies (ħω(p) between 6.6 and 7.5 eV and relaxation energies (ħ/τ) between 0.29 and 0.36 eV. Ellipsometer data for the semitransparent films show that the refractive index (n) in the visible increases with decreasing film thickness whereas the extinction coefficient (k) is essentially unchanged. The optical properties are improved by deposition upon a heated substrate.

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