The007th KARC Colloquium
The007th KARC Colloquium was ended. Thank you for the participation.
| Date&Time | December １１（Tuesday）, ２００１, From １: ３０pm -２ : ３０pm |
| Place | ＫＡＲＣ, Small-Meeting Room in the building No. 1 (2F) ５８８−２ Iwaoka, Iwaoka-cho, Nishi-ku, Kobe-city ６５１−２４９２ |
| Lecturer | "CW terahertz-wave generation and its application to imaging" |
| Speaker | Mr. Karsten Siebert (Physikalisches Institut der, J.W. Goethe-Universitaet, Germany) |
| Abstract | A CW-system with tunable single-frequency operation for the generation of electromagnetic radiation in theterahertz(THz)-frequency range (far infrared spectrum between 0.1 and 10 THz) offers a couple of advantages with respect to the standard time-resolved techniques. There is no need for a femtosecond-laser system which means a reduction in cost and maintenance. Because of the smaller dimensions of the lasers a further miniaturization of the THz system can be expected. In addition, there are some fundamental advantages with respect to the time-resolved systems. For time-resolved measurements with a high frequency resolution a long delay line is needed which shifts the generating optical pulse with respect to the detecting pulse. This makes the measurements very sensitive to the alignment of the optics involved and the measurements will take a rather long time. Sometimes the interpretation of the results can be impossible if reflections of the THz-pulse contribute strongly to the signal in the time domain or resonances (e.g. lattice vibrations) of the object are excited. For off-laboratory applications the CW-laser radiation can be guided in an optical fiber without dispersion. From CW-systems we might expect higher output power at a distinct frequency with respect to the pulsed systems where the power is spread over a broad frequency range. In the talk, the works on the Terahertz Optoelectronics by our group at J.W. Goethe-Universitaet is introduced with an emphasis on the CW-THz generation and its applications to spectroscopy and imaging. |
| Language | English |
| Admission | Free |
| Organizer | M. Tani |