11:00 〜 13:00
[PEM12-P08] Na saturation spectroscopy experiments with theoretical calculations for Na resonance scattering lidar
キーワード：共鳴散乱ライダー、Na 飽和分光実験
The Na resonance scattering lidar is a laser sensing system capable of measuring temperature and wind velocity in the mesosphere and lower thermosphere at 80-110 km altitudes. In order to perform this kind of measurement, it is vitally important to control the absolute laser frequency (or wavelength) for accurate measurements of the Doppler broadening (related with the temperature) and Doppler shift (related with the wind velocity) in the Na resonance fluorescence spectrum. The Na saturation spectroscopy experiments can produce fine structures (<10 MHz or <10 fm), called Lamb dips and crossover peaks, in the Na resonance fluorescence spectrum, and these structures can be used as the absolute frequency standards for the accurate laser frequency control.
In this study, we have been working on development of a new optical system for the Na saturation spectroscopy experiments with its theoretical aspect. For the theoretical calculations, we revisited the previous study, and the modeling of the experiments and its full derivation of the relevant equations have been reconstructed. These works have enabled us to make simulations of the experiments. As for the experiment, we have developed an optical system for the Na saturation spectroscopy experiments, which consisted of distributed feedback (DFB) lasers as a light source, a Na vapor cell, a heater box to maintain the cell in high temperature, etc. In this presentation, we will introduce our theoretical calculations and the developed optical system. Then, we will give some results of both simulations and experiments, and discussion on the performance of the developed optical system based on comparisons between the measured and simulated results.
In this study, we have been working on development of a new optical system for the Na saturation spectroscopy experiments with its theoretical aspect. For the theoretical calculations, we revisited the previous study, and the modeling of the experiments and its full derivation of the relevant equations have been reconstructed. These works have enabled us to make simulations of the experiments. As for the experiment, we have developed an optical system for the Na saturation spectroscopy experiments, which consisted of distributed feedback (DFB) lasers as a light source, a Na vapor cell, a heater box to maintain the cell in high temperature, etc. In this presentation, we will introduce our theoretical calculations and the developed optical system. Then, we will give some results of both simulations and experiments, and discussion on the performance of the developed optical system based on comparisons between the measured and simulated results.