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The dynamical characteristics of InAs/ InGaAs Quantum dot semiconductor laser under optical feedback
خصائص ليزر شبه الموصل InAs/InGaAs نوع النقطة الكمية الحركية درست تحت تأثير التغذية الاسترجاعية البصرية

Author: M.O.Oleiwi and C.A.Emshary مشتاق عبيد عليوي و جاسب عبد الحسين مشاري
Journal: Journal of Basrah Researches (Sciences) مجلة ابحاث البصرة ( العلميات) ISSN: 18172695 Year: 2014 Volume: 40 Issue: 1A Pages: 62-75
Publisher: Basrah University جامعة البصرة

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Abstract

We study the effects of optical feedback on the dynamics of InAs/InGaAs quantum dot semiconductor laser via the use of five equations model that describe the dynamics of such lasers and the addition of a new term that takes into account the effects of feedback and six equation concerning the phase of the electric field .The effect of a number of control parameters viz optical feedback strength, phase shift and round-trip time of light in the external cavity is being tested. Rich and varieties of dynamics appeared to occur ranging from periodic to chaotic ones.

درسنا تأثيرات التغذية العكسية البصرية في حركيات ليزر شبه الموصل InAs/InGaAs نوع النقطة الكمية من خلال استعمال أنموذج يتكون من خمس معادلات تصف أساسا حركيات هذا النوع من الليزرات وبإضافة حد جديد يأخذ بنظر الاعتبار تأثيرات التغذية العكسية ثم إضافة معادلة سادسة تصف تغيرات طور المجال الكهربائي .تمت دراسة تأثير عوامل سيطرة وهي شدة التغذية العكسية البصرية وإزاحة طور الضوء وزمن رحلة الذهاب والإياب في التجويف الخارجي . تولدت حركيات عديدة وغنية امتدت من الدورية وحتى الفوضوية.


Article
The Efficacy of fractional CO2 laser in management of surgical wound scars

Author: Abbas M, suhan*, Maha, Darweesh**
Journal: Al-Kindy College Medical Journal مجلة كلية الطب الكندي ISSN: 18109543 Year: 2014 Volume: 10 Issue: 2 Pages: 73-76
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Atrophic postoperative and traumatic scarring are common cosmetic problems for patients. Combining CO2 laser ablation with a fractional photothermolysis system in a treatment known as ablative fractional resurfacing fulfilling the new demands for a lesser risk of side effects and minimal or no downtime.Objective: To assess the safety and efficacy of ablation fractional CO2 laser treatments for surgical scarring .methods: Twenty one patient ( 14 women, and 7 men ) with various skin types , I to IV , aged 3 to 48 years , presents with 24 scars between June and December 2012 , four patients excluded from study because they are not continued in follow up , the remaining 17 patient completed all 3 treatments & 6 months follow up.Results: Adverse effects of treatment were mild to moderate , and no scarring or delayed onset hypopigmentation was observed, For all patients demonstrated improvements in skin texture and reduction of pain and discomfort and improvement of tenderness and hardness of the scar which become more soft and mature .Conclusions: The ablation CO2 laser treatment represent safe , effective treatment modality for improving scar quality , texture, maturation and appearance.Keywords: Ablative fractional lasers, CO2 lasers, traumatic scars, atrophic scars.

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