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Article
Performance Analysis of Laser Diode Single-End-Pumped Solid State Laser

Authors: Mohammed. J. Abdul-Razak --- Hisham .M. Ahmed --- Abdulla. K. Abass
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2013 Volume: 21 Issue: 4 Pages: 1359-1363
Publisher: Babylon University جامعة بابل

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Abstract

In this work, results are presented for a continuous wave diode laser single-end-pumped Nd:YVO4 laser with maximum output power of 240mW in the TEM00 mode at an optical pump power of 850mW. The laser performance under different output couplers has been studied both analytically and experimentally. The theoretical analysis provides a good prediction of the laser performance parameters which are in broad agreement with the experimentally observed results. An optical to optical conversion efficiency of 28% and an average optical slope efficiency of 29% were obtained. The fluctuation of the output power is less than 1.5% in 10 min.

تم في هذا العمل عرض نتائج ليزر Nd:YVO4 مستمر الموجة ومضخ طولياً بواسطة ليزر الدايود. حيث بلغت أعظم قدرة خارجة لهذا الليزر 240mW بنمط كاوسي TEM00 عند قدرة ضخ بصرية قدرها 850mW. تمت دراسة أداء الليزر عملياً وتحليلياً باستخدام مرآيا اقتران خرج ليزري ذات انعكاسيات مختلفة ، لقد أعطى التحليل النظري تكهناً جيداً لمعلمات أداء الليزر وكانت النتائج النظرية في تطابق جيد مع النتائج المقاسة عملياً بكفاءة تحويل بصرية- بصرية بلغت 28% وبمعدل كفاءة ميل بصرية 29%. وقد بينت الحسابات إن التذبذب الحاصل في القدرة الخارجة كان أقل من 1.5% خلال 10 دقائق.


Article
Thermal Lensing Reduction in Conventional and Composite Nd:YAG Laser Rod

Authors: Mohammed Jalal AbdulRazzaq --- Abdulla K. Abass --- Wail Yas Nassir
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 11 Part (A) Engineering Pages: 2031-2035
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A finite-element method (FEM) wasused to simulate numerically the effect of thermal lensing in YAG rods doped with Nd ion using LASCAD software. The temperature distribution and thermal lensing focal length of the composite laser rod (YAG/Nd:YAG) with one undoped end cap was considered and compared with conventional laser rod (Nd:YAG) by applying software. Results show that thermal lensing effects were reduced by a factor of 2 using (YAG/Nd:YAG) composite rod at pump power of 20W.

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