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Development of Chirp-Controlled Pump-Probe Technique and Study of TeraHertz Radiation Enhancement

In this thesis, a home made chirp-controlled pump-probe measurement system has been developed and is used to explain possible mechanism of THz radiation enhancement under positive chirped incident pulse. The chirp-controlled pump-probe measurement system with temporal resolution of around 100 femtosecond and chirp parameter tuning from ¡V350 fs2 to +650 fs2 is demonstrated. Meanwhile, using chirp-controlled pump-probe measurement system, ultrafast dynamics of photogenerated carrier in low-temperature growth GaAs in different chirp by is characterized. The relaxation time of low-temperature growth GaAs in positive chirp pump pulse is 461fs and shorter than one, which is 497fs, in negative chirp pump pulse. The result is explained by the Pump-Dump process in negative chirp pump pulse and similar band-filling effect in positive chirp pump pulse.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0726106-011334
Date26 July 2006
CreatorsLiao, Li-Yuan
ContributorsTsong-Ru Tsai, Chao-Kuei Lee, Jui-Hung Hsu, Ze-An Liu
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0726106-011334
Rightsrestricted, Copyright information available at source archive

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