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دراسة مقارنة بين ليزرات الابار الكمية والنقاط الكمية == Comparative Study Between Quantum Wells and Quantum Dots Lasers
Author name:
وطن حمود جبر
Supervisor name:
جاسب عبد الحسين مشاري
General topic:
Physics
Specific topic:
Laser Physics and Electro-optics
Degree:
Master
University:
University Of Basrah - College Of Education For Pure Sciences
Language:
Arabic
University location:
Basrah
First pages:
26T1694 - p.pdf
Abstract:
In the work we present a comprehensive comparison between the dynamics of quantum well and quantum dot semiconductor lasers working autonomously using two models, the first describe the temporal variation of carriers and photon densities respectively in the quantum well lasers and the second describe the carriers occupancies in the wetting layer and quantum dot and photon occupancy in the quantum dot lasers .The study was carried out on the delay time and level of the dc part of their power under the effect of the many parameters that appeared in those models. Both lasers dynamics were studied in the presence of injection current modulation which enhances lasers power range from periodic to chaotic one with varieties of periodic states such as period.1, period.2, period.3, period.4 and period.6. Developed chaos was noticed to occur.We propose and investigate a simple method to obtain complex output power from both lasers via pulse shaping of the injection current. During the three methods studied we noticed similarities and discrepancies in both lasers dynamics.
