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oai:jcga.repo.nii.ac.jp:00000222 2023-10-06T05:06:54Z 1:9:53

ブロードエリアレーザによるSub-THz電磁波信号スペクトル中の連続成分強度の定量的見積もり Quantitative Estimation of the Continuous Components in the Signal Spectrum of the Sub-THz Electromagnetic Wave Generated by a Broad-Area Laser Diode 森川, 治 モリカワ, オサム MORIKAWA, Osamu 藤田, 正実 フジタ, マサミ 萩行, 正憲 ハンギョウ, マサノリ FUJITA, Masami HANGYO, Masanori MLD-TDS broad-area laser diode continuous component time-resolved spectroscopy beam pattern Abstract By using a continuous-wave mutimode laser diode (cw-MLD) and a photoconductive antenna (PA), we can generate an electromagnetic radiation in the sub-THz region (sub-THz radiation). For the spectroscopy, the signal spectrum should be continuous. That may be achieved by using a broad-area laser diode (BLD) , because the BLD shows a quasi-continuous spectrum of light, which will cause optical beat with a quasi-continuous spectrum. However, the magnitude of the continuous components in the signal spectrum depends on the adjustments of the experimental setup, such as defocusing the BLD beam on the PA and using the BLD beam after transmission through a single-mode optical fiber. In this paper, we perform quantitative estimations of magnitude of the continuous components and compare it with the experimental results. The results show that the appearance or disappearance of the continuous components is explained by considering the mixing of light components with various beam patterns and the distribution of the phases of the light components. Further we discuss how we should treat the BLD beam when we apply it to the time-resolved spectroscopic measurement. 海上保安大学校 2012-03-30 jpn departmental bulletin paper VoR https://doi.org/10.15053/0000000222 https://jcga.repo.nii.ac.jp/records/222 10.15053/0000000222 10.15053/2011.21.01 AN10088865 0287-2951 海上保安大学校研究報告, 理工学系 Report of Japan Coast Guard Academy Part 2 (The Science and Engineering Section) 55 1-2 1 15 https://jcga.repo.nii.ac.jp/record/222/files/2_55-1-77-01_Morikawa.pdf application/pdf 1.4 MB 2023-06-03