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Generation and detection of ultra fast laser pulses using semiconductor laser / by Eng. Mohamed Hemdan Mohamed Aboelenein ; under the supervision of Assoc. Prof. Dr. Salah Hassab Elnaby, Prof. Dr. Amin Fahim Hassan.

By: Contributor(s): Material type: TextTextLanguage: English Summary language: English, Arabic Producer: 2022Description: 67 pages : Illustrations ; 25 cm. + CDContent type:
  • text
Media type:
  • Unmediated
Carrier type:
  • volume
Other title:
  • توليد وكشف فائق السرعة نبضات الليزر باستخدام ليزر أشباه الموصلات [Added title page title]
Subject(s): DDC classification:
  • 621.3661  21
Available additional physical forms:
  • Issues also as CD.
Dissertation note: Thesis (Ph.D)-Cairo University, 2022. Summary: A model for generating femtosecond laser pulses from a low-power mode-locked laser of moderate temporal half-width was proposed. This was achieved by injecting the pulse into a single-mode inverted-populated Er-doped fiber where self-focusing and absorption were avoided. To initiate spectral broadening, the pulse was phase- modulated by subjecting a part of the fiber to an electric field of suitable intensity and frequency generated into a circular capacitor. To stimulate temporal compression, the phase-modulated pulse was introduced into a ombination of two symmetrically located prism sets with respect to the x-axis. After passing the pulse through the first prism set, its spectral components were spatially separated in the y-axis. The spectral phases were anipulated by redirecting the spectral components through a slab cross-section that was subjected to a spatially modulated DC electric field. After passing the slab, the pulse is directed into the second prism set, where the spectral components were spatially overlapped and propagated outside the compressor with the same slope and dimension as before entering the compressor. Constructive super positioning of the phase manipulated spectral components gave maximum intensity only at a specified location Summary: تهدف هذه الرسالة إلي إنتاج نبضات ليزر بطول زمني في حدود ثانية وذلك من نبضات ليزر مترابطة النهج ذو قدرة في حدود الميلي وات وبطول زمني في حدود ثانية وذلك في مكان محدد. ولما كان حسب نظرية هايزنبرج النطاق الترددي اللازم للحصول على زمن النبضة المشار إليه هوهرتز , فإنه البد من زيادة لعدد الترددات المكونة للنبضة المشعة من تموية قدرة نبضة مؤثر خارجي
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Thesis (Ph.D)-Cairo University, 2022.

Bibliography: pages 57-65.

A model for generating femtosecond laser pulses from a low-power mode-locked laser of moderate temporal half-width was proposed. This was achieved by injecting the pulse into a single-mode inverted-populated Er-doped fiber where self-focusing and absorption were avoided. To initiate spectral broadening, the pulse was phase-
modulated by subjecting a part of the fiber to an electric field of suitable intensity and frequency generated into a circular capacitor. To stimulate temporal compression, the phase-modulated pulse was introduced into a ombination of two symmetrically located prism sets with respect to the x-axis. After passing the pulse through the
first prism set, its spectral components were spatially separated in the y-axis. The spectral phases were anipulated by redirecting the spectral components through a slab cross-section that was subjected to a spatially modulated DC electric field. After passing the slab, the pulse is directed into the second prism set, where the spectral
components were spatially overlapped and propagated outside the compressor with the same slope and dimension as before entering the compressor. Constructive super positioning of the phase manipulated spectral components gave maximum intensity only at a specified location

تهدف هذه الرسالة إلي إنتاج نبضات ليزر بطول زمني في حدود ثانية وذلك من نبضات ليزر مترابطة النهج ذو قدرة في حدود الميلي وات وبطول زمني في حدود ثانية وذلك في مكان محدد. ولما كان حسب نظرية هايزنبرج النطاق الترددي اللازم للحصول على زمن النبضة المشار إليه هوهرتز , فإنه البد من زيادة لعدد الترددات المكونة للنبضة المشعة من تموية قدرة نبضة مؤثر خارجي

Issues also as CD.

Text in English and abstract in Arabic & English.

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