In this thesis, a chirp-controlled pump-probe system has been developed to investigate the role of chirp in mode-locking mechanism. By modulating pump power and focusing condition, power, chirp, and wavelength dependent transient reflectivity ( £GR /R), pulse duration, and amplitude ratio in pump-probe measurement for the multiply-strained-quantum-well saturable Bragg reflector (SSBR) are presented. According this study, one can find a more efficient and stable mode-locking mechanism through proper chirp arrangement inside cavity.
Compared to the case of transform-limited pump condition, shorter fast-carrier-lifetime and smaller amplitude ratio of slow and fast relaxation contribution are observed in negative chirp excitation condition. Meanwhile, we can see that there is a shorter fast-carrier-lifetime and a smaller amplitude ratio in case of excitation pulse with -25000 ( fs^2 ) chirp or increasing fluence ¡]2 £gm/cm^2->12 £gm/cm^2 ¡^. The results show that the pulse compression strength is stronger in -25000 ( fs^2 ) chirp and full with the tendency demonstrated by pulse shaping factor. All of these experimental results show that -25000 ( fs^2 ) chirp is the best chirped control condition to make mode-locking more efficient and stable. In addition, with the increasing fluence ¡]2 ->12 £gm/cm^2 ¡^, three times of saturable fluence, a more stable and efficient mode-locking condition is expectable.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0729108-124753 |
| Date | 29 July 2008 |
| Creators | Wu, Jhong-Rong |
| Contributors | Ann-Kuo Chu, Chao-Kuei Lee, Yi-Jen Chiu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0729108-124753 |
| Rights | not_available, Copyright information available at source archive |
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