نتایج جستجو برای: semiconductor laser

تعداد نتایج: 237377  

Journal: :journal of lasers in medical sciences 0
mohammad reza razaghi laser application in medical sciences research center, shahid beheshti university of medical sciences, tehran, iran hooman mokhtarpour laser application in medical sciences research center, shahid beheshti university of medical sciences, tehran, iran mohammad mohsen mazloomfard laser application in medical sciences research center, shahid beheshti university of medical sciences, tehran, iran

introduction: laser-assisted vaporization of prostate tissue by means of the potassiumtitanyl- phosphate (ktp) laser is in clinical use. alternative laser sources are available but are lacking clinical experience.the 980 nm wavelength diode laser provides good hemostasis, in addition to a more rapid ablation rate. the aim of this study is approving the capability, feasibility, and good post-ope...

Journal: :journal of skin and stem cell 0
abbas majdabadi department of gaseous lasers, atomic energy organization of iran, tehran, iran mohammed abazari faculty of energy engineering and physics, amirkabir university of technology, tehran, iran; faculty of energy engineering and physics, amirkabir university of technology, p.o. box: 15875-4413, tehran, iran. tel: +98-9377326811, fax: +98- 6641 4113

results the simulation results showed that the penetration depth and temperature rise of 980 nm wavelengths were different from those of 1064 nm wavelength. it appeared that 1064 nm wavelength penetrated to deeper layers of tissue compared with 980 nm. moreover, temperature rise during 1064 nm irradiation led to temperature increase in allowable ranges. the findings proved the reason why 1064 n...

Journal: :the modares journal of electrical engineering 2007
mohammad razaghi vahid ahmadi abas zarifkar

transfer matrix method (tmm) has been applied to analyze characteristics of semiconductor laser optical amplifiers. the input signal is sinusoidal modulating wave and we do not assume the modulating bias signal as well. we have shown that the distoration arises from gain modulation at low modulation frequencies, but in microwave modulation frequencies, the gain takes an average value and the re...

جمشید صباغزاده, , زهرا حقی, , صدیقه دادرس, ,

  In this paper we explain in detail the design of a semiconductor laser coupled with the reflected beams from a grating. Since the beams reflected are diffracted at different angles, only one component of them can be resonated in the cavity. This technique reduces the output frequency of the laser and increases its stability.   Since this system has various applications in the spectroscopy, ga...

2008
Sze-Chun Chan Rosemary Diaz Jia-Ming Liu

With a proper perturbation, even a single-mode semiconductor laser can exhibit highly complex dynamical characteristics ranging from stable, narrow-linewidth oscillation to broadband chaos. In recent years, three approaches to invoke complex nonlinear dynamical states in a single-mode semiconductor laser have been thoroughly studied: optical injection, optical feedback, and optoelectronic feedb...

2016
J.-M. Lourtioz L. Chusseau N. Stelmakh

Generation of short optical pulses in semiconductor lasers is of practical interest for an increasing number of applications. It is also of fundamental interest because of its tight relation with the field of semiconductor laser dynamics. After an introductory review, we compare the performances of gain-switching, Q-switching and mode-locking techniques. The comparison is illustrated by experim...

Journal: :Analytical Sciences 1993

Journal: :Physics and High Technology 2010

2013
Guang-yu JIANG Juan ZHANG Yan HUANG

Abstract: We reveal theoretically chaos and its control in a semiconductor laser with delayed negative optoelectronic feedback. Under nonperiodic or sinusoidal period optoelectronic current, the semiconductor laser exhibits rich nonlinear dynamics. For a given coupling constant, chaos is shown in a semiconductor laser directly injected by external light. For a photoelectric delayed negative-fee...

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