Towards a multi-wavelength depolarization lidar using a coherent white light continuum

• Main Authors: Somekawa, Toshihiro, Yamanaka, Chichiro, Fujita, Masayuki, Galvez, Maria Cecilia D.
• Format: text
• Published: Animo Repository 2022
• Subjects: Optical radar; Wavelengths
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/5892
• Institution: De La Salle University

We propose a new method for the white light lidar by depolarization signals. The white light lidar system employs a coherent white light continuum whose wavelength ranges from the UV to the IR region as the light source and has a potentiality of simultaneous multi-wavelength measurements. In addition, the white light continuum showed the linear polarization similar to the original laser pulse. We carried out depolarization lidar at 450 nm for the first time using a coherent white light continuum. The obtained signals showed relatively high ratios as water droplet clouds. To confirm the wavelength dependence of the depolarization lidar signals, we developed the simultaneous multi-wavelength lidar system. The new lidar system consisted of three depolarization channels at 450, 550 and 800 nm. We evaluated the polarization properties of this 3-wavelength depolarization backscattering spectrometer and performed a preliminary field experiment for some targets at the distance of ˜40 m from the receiving point.