Investigations of the generation of tunable continuous-wave terahertz radiation and its spectroscopic applications [Elektronische Ressource] / von Icksoon Park

Investigations of the Generation ofTunable Continuous-Wave Terahertz Radiationand Its Spectroscopic ApplicationsVom Fachbereich Physikder Technischen Universit˜at Darmstadtzur Erlangung des Gradeseines Doktors der Naturwissenschaften(Dr. rer. nat.)genehmigte Dissertation vonDipl.-Phys. Icksoon Parkaus Yeonsan/Sudk˜ oreaReferent: Prof. Dr. W. Els˜a…erKorreferent: Prof. Dr. P. Mei…nerTag der Einreichung: 05.12.2006Tag der Prufung:˜ 29.01.2007Darmstadt 2007D172Contents1 Introduction 12 Tunable Dual-Mode Semiconductor Lasers 72.1 Semiconductor Lasers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.1.1 Principle of Semiconductor Lasers . . . . . . . . . . . . . . . . . 82.1.2 Tunable External Cavity Semiconductor Lasers (ECSLs) . . . . 92.1.3 Dual-Mode Theory . . . . . . . . . . . . . . . . . . . . . . . . . 112.1.4 Dynamics of Dual-Mode External Cavity Semiconductor Lasers 132.2 Realization of Frequency-Tunable Dual-Mode Lasers . . 132.2.1 Dual-Mode SL Using a Double-Littman-Conflguration . . . . . . 142.2.2 Spatial Intensity Distribution of Dual-Mode Emission . . . . . . 232.2.3 Temporal Behavior of Dual-Mode Emission . . . . . . . . . . . . 252.2.4 Dual-Mode SL Using a Double-Littrow-Conflguration . . . . . . 262.3 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293 Generation of Tunable CW THz Radiation via Photomixing 313.1 Principle of Generation of CW THz Radiation via . . . . 313.1.1 Photomixing. . . .