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Article
Study of a Dye-Assisted Diode Laser System for Ablation of Dental Caries
استخدام ليزر شبه موصل لأستئصال نخر اسنان بمساعدةالصبغ العضويه

Author: Z. T. AL-DAHAN زياد طارق الدهان
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2009 Volume: 12 Issue: 1 Pages: 47-57
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

In this work, a continuous wave semiconductor diode laser (GaAlAs) which emits radiation at 810 nm and power of 2W maximum was used to ablate caries enamel and dentine from extracted human teeth in conjunction with specialized diode laser absorbing dye “indocyanine green”. This technique offers selective ablation with minimal risk of thermal damage to surrounding dental tissues because the uptake of the dye and its irradiation by the diode laser together control the ablation.

شبه موصل موجةِ مستمرِ لليزر (GaAlAs) الذي يَبْعثُ الإشعاعَ في 810 nm وقوَّة 2 واط كحَدّ أعلى اُستَعملُ لإسْتِئْصال نخر المينا وعاجِ ِ الأسنان الإنسانيةِ المُنْتَزعةِ باستخدام ليزرَ يَمتصُّ صبغاً "أخضر indocyanine ". توفر هذه التقنيةِ بالخطرِ الأقل ما يمكنِ مِنْ الضررِ الحراريِ إلى أنسجةِ المحيطةِ بالأسنانِ لأن منفذَ الصبغِ وإنارتِه بليزرِ شبه الموصل يُسيطرانِ على الإستئصالِ سوية.


Article
Performance Optimization of Multi-Quantum Wells Laser Used in Optical Communications

Author: S.S. Jasim
Journal: Iraqi Journal of Applied Physics Letters الرسائل العراقية في الفيزياء التطبيقية ISSN: 1999656X Year: 2009 Volume: 2 Issue: 2 Pages: 11-14
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, an analytical treatment of some design parameters of multiquantum well semiconductor laser aiming to optimize the performance of such systems is presented. The treatment concentrates on three main parameters; the reflectivity of the front mirror, the effective lifetime of the photon inside laser cavity, and the number of quantum wells in the laser structure. These three parameters relate to several other parameters which impose to achieve design compensation. Such compensation can be simulated by analytical treatments because the characteristics of these lasers have been established well in form of small and large signal solutions. These lasers are increasingly studied due to their characteristic features in optical communications architectures, low-dimensioned photonics and optoelectronics devices.

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