نتایج جستجو برای: lasers
تعداد نتایج: 23539 فیلتر نتایج به سال:
We present a review of the use of diode lasers in atomic physics with an extensive list of references. We discuss the relevant characteristics of diode lasers and explain how to purchase and use them. We also review the various techniques that have been used to control and narrow the spectral outputs of diode lasers. Finally we present a number of examples illustrating the use of diode lasers i...
OBJECTIVE This study was designed to assess and compare the efficacy of accelerating burn healing in diabetic rats using low-power visible and invisible lasers. BACKGROUND DATA Low-level laser therapy (LLLT) has been used in a number of diabetic animal and human studies, with both positive and no effects. MATERIALS AND METHODS Male Sprague-Dawley rats were used in the study. Streptozotocin ...
We study the onset of synchronization in a network of N delay-coupled stochastic fiber ring lasers with respect to various parameters when the coupling power is weak. In particular, for groups of three or more ring lasers mutually coupled to a central hub laser, we demonstrate a robust tendency toward out-of-phase (achronal) synchronization between the N-1 outer lasers and the single inner lase...
A new microfabrication technique, mass transport, has made possible the development of a new breed of semiconductor laser devices. Mass-transported buried-heterostructure GaInAsP lasers are ideally suited for application in optical-fiber communication systems. In fact, the technology for mass-transported buried-heterostructure lasers has been transferred to a commercial fabricator, and these la...
A comprehensive model for photon noise and correlations in semiconductor cascade lasers is presented. Photon emission events in different gain sections of cascade lasers are correlated. These correlations are found to be positive and arise because the gain sections are connected electrically. The scaling of photon correlations and intensity noise with the number of cascade sections is discussed...
Gain guided AlGaAs lasers in which the current is restricted to flow between two narrow stripes have been fabricated. The double current confinement configuration, which is fabricated by a selective meltback-growth technique, enables the current injection to be restricted to a very narrow section of the active layer. These lasers exhibit very strong antiguiding and operate in many longitudinal ...
Much of this uncertainty stems from not comparing “apples to apples,” in terms of the type of lasers utilized and the way that studies are designed. Certain lasers are used specifically for soft tissue treatment. These include the CO2, Nd:YAG, and diode lasers. Others can be used for both soft and hard tissue applications. These are the Er:YAG and Er, Cr:YSGG lasers. They must be compared withi...
We demonstrate electrically pumped InGaAsP two-dimensional Bragg grating (2DBG) lasers with two line defects. The 2DBG structure uses a weak 2D index perturbation surface grating to control the optical modes in the plane of the wafer. Measurements of the 2DBG lasers show that modal control in both the longitudinal and transverse directions is due to the gratings and defects. The 2DBG lasers are...
Comprehensive numerical simulations with the transmission-line laser model (TLLM) are used to compare the behavior of gain-coupled DFB lasers with index-coupled DFB lasers fabricated from identical materials. These simulations compare slope efficiency, threshold current, spectra, smallsignal modulation bandwidth, maximum-intrinsic modulation bandwidth, large-signal transient response and chirp,...
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