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Article
Design and Simulation of DPSS Laser with SHG for Material Processing

Author: A.A. Alsharify
Journal: Iraqi Journal of Applied Physics Letters الرسائل العراقية في الفيزياء التطبيقية ISSN: 1999656X Year: 2009 Volume: 2 Issue: 1 Pages: 3-8
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In the present work, multilayer reflection coating analysis has been employed for design and simulating diode-pumped solid state (DPSS) laser system with second harmonic generation (SHG) using composite crystal (DPM010X). It was found that the optical reflection greatly depends on the refractive index, optical thickness and number of anti-reflection coating layers used. The calculated refractive index was found to be 1.949 for phase matched angle of 23.2° for the KTP non-linear crystal.

Keywords

DPSSL --- SHG --- KTP --- Nonlinear crystal --- Optical pumping


Article
Design and Construction Optical Pumping System
تصميم وبناء منظومة ضخ ضوئي

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Abstract

In this work the design and construction of optical pumping system was presented. The parameters of the pumping source to obtain discharge current density sufficient to shift the flash lamp spectrum towards uv portion of spectrum were measured.The current density was supplied to the flash lamp must be greater than 4000Amp./cm2 to obtain the spectral range wavelength lies between 0.2 and 0.35m. The current density was obtained by a capacitor 50F, at 7KV discharge voltage. The applied electrical energy to the flash lamp was more than 1200 J, and the current density was around 5000 Amp./cm2.The electrical parameters of the flash lamp were calculated. The impedance parameters(K0) from the voltage and the peak current pulse was measured in range equal to 57, while the damping factor() was 1.3. The energy of the flash lamp was around 75% from the input electrical energy. The external trigger circuit was limited the increase the applied voltage, which is responsible for the damping factor.

ي هذا البحث تم تصميم وبناء منظومة ضخ ضوئي . حسبت معلمات مصدر الضخ لإزاحة منطقةالطيف الضوئي إلى المنطقة فوق البنفسجية . كثافة تيار التفريغ الكهربائي للمصباح الوميضي والذي يجب أن- يكون قيمته اعلى من 2444 أمبير/سم 4 ومنطقة الطيف واقعة ضمن مجال الأطوال الموجية 4.44 4.4مايكروميتر. للحصول على تلك القيم من كثافة التيار تم استعمال متسعة ذات قيمة 44 مايكرفاراد وفولتية تفريغ4كيلوفولت. الطاقة الكهربائية المعطاة للمصباح الوميضي هي أعلى من 4444 جول,وكثافة تيار 4444أمبير/سنتميتر 4. تم حساب المعلمات الكهربائية للمصباح الوميضي .معامل الممانعة من قمة نبضة التيار% والفولتية هي 44 .بينما قيمة ثابت الانحلال هي 4.4 ان الطاقة المستلمة من المصباح الوميضي هي بحدود 44من الطاقة الكهربائية المعطاة. ذلك التحديد الناتج من دائرة القدح الخارجية زاد من قيمة الفولتية المسلطةوالمسؤول عن معامل الاضمحلال.


Article
Temperature Dependencies of Refractive Index and Optical Elasticity Coefficient on Lens Induced in Nd:YAG Crystal

Authors: O.A. Hammadi --- M.S. Edan
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2012 Volume: 8 Issue: 1 Pages: 35-41
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, one effect of the optical pumping power on the characteristics of a solid-state Nd:YAG laser was studied. The main parameter considered is the change in focal length of lens induced in the Nd:YAG crystal due to temperature-dependent variation in both refractive index and optical elasticity coefficient. The pumping-induced change in focal length of such lens is an important parameter in laser design as it determines how long the optical resonator may keep its stability during operation. It also assigns the main features to be considered in order to obtain the optimum characteristics of the produced laser beam. This investigation does not consider all aspects may affect laser operation but it represents a forward step to understand the intracavity limitations of solid-state, specially Nd:YAG, laser.


Article
Numerical Analysis of Temperature Dependencies of Optical Elasticity Coefficient on Lens Induced in Solid-State Laser Crystal

Authors: Haider M. Majeed --- Riyadh A. Jassim --- Ahmed J. Kadhim
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2018 Volume: 14 Issue: 2 Pages: 35-42
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, one effect of the optical pumping power on the characteristics of a solid-state Nd:YAG laser was studied. The main parameter considered is the change in focal length of lens induced in the Nd:YAG crystal due to temperature-dependent variation in both refractive index and optical elasticity coefficient. The pumping-induced change in focal length of such lens is an important parameter in laser design as it determines how long the optical resonator may keep its stability during operation. It also assigns the main features to be considered in order to obtain the optimum characteristics of the produced laser beam. This investigation does not consider all aspects may affect laser operation but it represents a forward step to understand the intracavity limitations of solid-state, specially Nd:YAG, laser.

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