نتایج جستجو برای: ingan laser diode
تعداد نتایج: 198815 فیلتر نتایج به سال:
We report on high-electrical-stress testing of Nichia GaN/InGaN/AlGaN single-quantum-well (SQW) light-emitting diodes. In contrast to our earlier experiments with double-heterostructure LEDs, the present SQW devices have been improved to the point that the encapsulating plastic fails under high electrical stress earlier than the diode itself. ( 1998 Published by Elsevier Science B.V. All rights...
any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...
the standards of endodontics have constantly been raised in the last 25 years by practitioners’ researches and their interest. most of the scientists believe the recent developments and the use of lasers as the most exciting achievement in endodontic treatment. nowadays, lasers are being used in endodontics to improve the prognosis of the root-filled teeth. the implement of suitable wavelengths...
background and aims. considering the importance of disinfecting dentin after cavity preparation and the possible effect of disinfection methods on induction of various reactions between the tooth structure and the adhesive restorative material, the aim of the present study was to evaluate microleakage of composite resin restorations after disinfecting the prepared dentin surface with nd:yag and...
The performance of devices fabricated from GaN and related compounds is strongly affected by the resistances caused by electrical contacts. To avoid excessive heating resulting in a failure of the device, specic contact resistances less than ,10 Wcm for light-emitting diodes (LEDs) and less than ,10 Wcm for laser diodes are required. This applies in particular to ohmic contacts on p-doped GaN ...
abstract background: in recent years, the endovenous laser therapy (evlt) has been proposed to treat the incompetent greater saphenous veins (gsv) to increase patient comfort,and to reduce cost as well as risk. evlt causes vein wall thickening, luminal contraction and vein fibrosis. the purpose of this article, as the first report from iran, is to review our experience and outline the early res...
It is crucial to fabricate nano photonic devices such as nanolasers in order to meet the requirements for the integration of photonic and electronic circuits on the nanometre scale. The great difficulty is to break down a bottleneck as a result of the diffraction limit of light. Nanolasers on a subwavelength scale could potentially be fabricated based on the principle of surface plasmon amplifi...
Related Articles Design and modeling of InP-based InGaAs/GaAsSb type-II “W” type quantum wells for mid-Infrared laser applications J. Appl. Phys. 113, 043112 (2013) Analysis of perturbations in the lateral far-field of blue InGaN laser diodes Appl. Phys. Lett. 102, 043504 (2013) In-depth analysis of injection-seeded long external cavity InGaN/GaN surface-emitting laser J. Appl. Phys. 113, 04310...
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