Generation of phase-locked high harmonics by implementing an optical frequency divider

• 資料種別: 博士論文
• タイトル: Generation of phase-locked high harmonics by implementing an optical frequency divider
• 著者・編者: NURUL, SHEEDA BINTI SUHAIMI
• 著者標目: NURUL, SHEEDA BINTI SUHAIMI
• 出版事項: The University of Electro-Communications
• 出版年月日等: 2016-03-25
• 出版年（W3CDTF）: 2016-03-25
• 並列タイトル等: 光周波数分割技術を用いた位相同期高調波光系列発生
• タイトル（掲載誌）: 学位論文
• 授与機関名: 電気通信大学
• 授与年月日: 2016-03-25
• 授与年月日（W3CDTF）: 2016-03-25
• 報告番号: 甲第849号
• 学位: 博士（工学）
• 博論授与番号: 12612甲第849号
• 本文の言語コード: eng
• 対象利用者: 一般
• 一般注記: We have successfully generated a new broadband coherent light source in the continuous wave (CW) regime which is an ensemble of multi-harmonic radiations including the fundamental frequency by implementing a frequency dividing technology. The frequency dividing technology which divides an optical frequency to an integer ratio has been studied with the aim of coherently linking independent lasers as part of a historical trend toward the establishment of an optical frequency standard. Such lasers are attractive not only for establishing a frequency standard but also as a coherent light source itself for various practical uses. The laser radiations produced with such technology has provided us five phase-locked harmonics with extremely wide frequency spacing and bandwidth that extends from 124.7 to 623.7 THz, f1: 2403 nm (36 mW), f2: 1201 nm (371 mW), f3: 801 nm (26 mW), f4: 600 nm (28 mW), f5: 480 nm (4 mW). Each harmonic shows a good beam quality, practical spectral power and fine phase coherence among them both in time and space. The system is uniquely designed that all harmonics are generated and propagate coaxially which has not been demonstrated by anyone yet. This design gives the advantage of robustly maintaining the phase coherence among the harmonics against disturbances. The potential applications for this light source can be diverse. In the frequency domain, each of the harmonics can be used as a single-frequency laser source. Moreover, by locking the system to a frequency standard, they can be used for ultra-high precision technology such as high resolution spectroscopy and high precision frequency metrology. In the time domain, the broadband spectrum can be used to synthesize ultrashort pulses train which can be very useful in the study of ultrafast science and technology. The highlight is that this light source has a high potential for the arbitrary optical waveform (AOW) synthesis in the continuous wave (CW) regime. The arbitrary-shaped optical field wave in the time scale of sub-femtosecond can be synthesized by precise control of the spectral phase and amplitude of a broadband harmonics. Such waves can be used to control the motion of electron through atoms and molecules which can be very useful for atto-science study. This technology has not been performed yet due to the limitation of the existing CW light source. In this thesis, we demonstrated that the frequency of 801-nm ( f3 ) single-frequency diode laser is exactly divided by three by generating the difference frequency with another single-frequency diode laser at wavelength of 1201nm (f2~2/3f3), producing a radiation at wavelength of 2403 nm (f1=f3?f2). Then, we generated the second harmonic of f1, (f2′=2f1) and compared it with the frequency f2 of 1201-nm laser. Based on such frequency comparison, we controlled the 1201-nm laser so that the two frequencies, f2 and f2′, coincide exactly. When this frequency control is achieved with a phase precision, the optical-frequency divide-by-three process is completed, resulting in generation of three phase-locked harmonics with an exact integer-frequency ratio of f1 : f2 : f3 = 1 : 2 : 3. Then, based on the generated three phase-locked harmonics, we further generated the 4th ( f4: 600 nm) and the 5th (f5: 480 nm) phase-locked harmonics by generating sum frequencies among the three phase-locked radiations, as f4 = f1 + f3 and f5 = f2 + f3. The total of five harmonics was evaluated in terms of phase coherence stability, spectral power and beam quality.; 2015
• 国立国会図書館永続的識別子: info:ndljp/pid/10121506; https://dl.ndl.go.jp/pid/10121506
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• 収集根拠: 博士論文（自動収集）
• 受理日（W3CDTF）: 2016-07-07T04:28:02+09:00
• 記録形式（IMT）: application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: http://id.nii.ac.jp/1438/00000829/
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp