Scintillation measurement with 7-um-band tunable laser in different seasons

Naoki Kagawa; Osami Wada; Ryuji Koga

doi:10.1117/12.177968

Abstract

Results of the field measurement of scintillation for a 7 micrometers band semiconductor laser beam are described. To investigate the contribution of absorption, wavelength of the IR laser was tuned to a H₂O absorption line center. The scintillation for a 0.67 micrometers visible laser was also monitored to compare with the IR's scintillation. This experiment was carried out in the daytime in the winter as well as in the summer of 1993. The power spectral density functions (PSDFs) were calculated from the experimental results of each season. In winter, the level of the PSDFs for the visible light was found about 10 times bigger than that for IR light. The PSDFs agreed with the theory reported by Filho. In summer, the PSDFs levels of the IR light, however, rise up to those of the visible one. The measured PSDFs for the TDL disagreed with the theoretical PSDFs. The scintillation for the IR lights is weaker than that for the visible lights in the theory only based on the temperature fluctuation. However, our experimental results show that the PSDFs for IR light is as strong as that for the visible lights in the condition of the high temperature and humidity.

Citation Download Citation

Naoki Kagawa, Naoki Kagawa, Osami Wada, Osami Wada, Ryuji Koga, Ryuji Koga, } "Scintillation measurement with 7 μm-band tunable laser in different seasons", Proc. SPIE 2222, Atmospheric Propagation and Remote Sensing III, (29 June 1994); doi: 10.1117/12.177968; https://doi.org/10.1117/12.177968

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