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Proceedings Paper

Development of a terawatt coherent white light lidar system and applications to environmental studies
Author(s): Chihiro Yamanaka; Toshihiro Somekawa; Maria Cecilia Galvez; Masayuki Fujita
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Paper Abstract

We have been developing a coherent "white light" lidar using a terawatt laser system at 800 nm with a 9m length krypton gas cell, which emits a coherent supercontinuum from UV to near infrared regions. Linearly polarized supercontinuum was transmitted to the atmosphere, and backscattered light was collected with a telescope of 31.8 cm in a diameter and the light was separated into 3 to 5 wavelengths using dichroic mirrors and interference filters. Mainly, we used the wavelengths of 450, 550, 700nm and 800 nm with each bandwidth of 10 to 40 nm. Although, the energy of light included in each wavelength range is restricted, the advantage of multi-spectral features on the same optical axis of this system enables us to use preferred spectral lines for various measurements. The system was successfully applied as a depolarization lidar as well as a multi line Mie scattering lidar for cloud particles and Aeolian dusts. By comparing the response for each spectrum, we can determine the size of particles with information on their shapes. Current research is focused to find applications in near infrared region of the white light.

Paper Details

Date Published: 11 December 2008
PDF: 8 pages
Proc. SPIE 7149, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications II, 71490Z (11 December 2008); doi: 10.1117/12.806415
Show Author Affiliations
Chihiro Yamanaka, Osaka Univ. (Japan)
Toshihiro Somekawa, Osaka Univ. (Japan)
Institute for Laser Technology (Japan)
Maria Cecilia Galvez, De La Salle Univ. (Philippines)
Masayuki Fujita, Institute for Laser Technology (Japan)

Published in SPIE Proceedings Vol. 7149:
Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications II
Allen M. Larar; Mervyn J. Lynch; Makoto Suzuki, Editor(s)

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