نتایج جستجو برای: intensity modulation
تعداد نتایج: 326343 فیلتر نتایج به سال:
Although gigahertz-scale free-carrier modulators have been demonstrated in silicon, intensity modulators operating at terahertz speeds have not been reported because of silicon's weak ultrafast nonlinearity. We have demonstrated intensity modulation of light with light in a silicon-polymer waveguide device, based on the all-optical Kerr effect-the ultrafast effect used in four-wave mixing. Dire...
The modulation response, relative intensity noise (RIN) and frequency noise (FN) characteristics of quantum dot (QD) lasers are investigated theoretically in the presence of an external optical beam. Using small signal analysis of the rate equations for carriers and photons, it is demonstrated that by injecting excess carriers into the QDs excited state through optical pumping, the modulation r...
The calculated behavior of Gb/s on-off modulated scaled microlasers exhibit a non-monotonic dependence of timing jitter on spontaneous emission factor, β. Microlasers with 10-2 < β < 10-1 give optimal performance for Gb/s on-off modulated applications requiring less than 20 ps jitter and greater than 20 dB optical power contrast ratio.
This chapter describes the basic principles of intensity-modulated radiation therapy (IMRT), providing the necessary background for subsequent clinical chapters. We start by describing the IMRT treatment planning and delivery process, introducing the wide range of different approaches and technologies currently in clinical use. Then, other topics important in the implementation of IMRT are disc...
Fiber optics is the fastest and reliable means of transferring large amounts of data Optical fiber links are used for local area networks to world wide data communication. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. Digital optical communications explores the practical applications of this union...
The purpose of this application note is to demonstrate the possibilities of the 2D-ARRAY seven29 from PTW in combination with the VeriSoft analysis software as a dosimetric verification tool of clinical IMRT fields. For this demonstration, the Varian IMRT system is used, which consists of the IMRT treatment planning system Eclipse Helios V7.2.24 and Varian Clinac accelerators, which are equippe...
IMRT / 1 The American College of Radiology, with more than 30,000 members, is the principal organization of radiologists, radiation oncologists, and clinical medical physicists in the United States. The College is a nonprofit professional society whose primary purposes are to advance the science of radiology, improve radiologic services to the patient, study the socioeconomic aspects of the pra...
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