منابع مشابه
Supercontinuum-based 10-GHz flat-topped optical frequency comb generation.
The generation of high-repetition-rate optical frequency combs with an ultra-broad, coherent and smooth spectrum is important for many applications in optical communications, radio-frequency photonics and optical arbitrary waveform generation. Usually, nonlinear broadening techniques of comb-based sources do not provide the required flatness over the whole available bandwidth. Here we present a...
متن کاملReliability Analysis of FSO Communication Links Using Aberrated Divergent rectangular Partially Coherent Flat- Topped Beam
The effects of aberration on the Bit-Error-Rate (BER) and reliability of free- space optical (FSO) communication links are investigated. Based on aberrated divergent rectangular partially coherent flat-topped beam formula on the receiver plane and considering the atmosphere losses due to absorption and scattering, numerical values for Power In Bucket (PIB), Signal to Noise Ratio (SNR) and BER a...
متن کاملCoherence characterization of partially coherent flat-topped beam propagating through atmospheric turbulence
We study the change in the degree of coherence of a partially coherent flat-topped (PCFT) beam propagating through atmospheric turbulence. It is shown analytically that with a fixed set of source parameters and under a particular atmospheric turbulence model, a PCFT beam propagating through atmospheric turbulence reaches its maximum value of coherence after propagating a particular distance, an...
متن کاملModal decomposition of partially coherent flat-topped beams produced by multimode lasers.
We present a simple mathematical model giving a possible description of a partially coherent light beam exhibiting a flat-topped transverse intensity profile. Such a model allows us to deduce the modal distribution inside a multimode stable optical cavity, assuming that the modes are of the Hermite-Gauss type. The analytical expression used to represent flat-topped profiles is of the flattened ...
متن کاملPropagation Characteristics of Aberrated Partially Coherent Flat-topped Beam in Turbulent Atmosphere
In this paper, we investigate the characteristics of a partially coherent flat-topped (PCFT) beam through turbulent atmosphere. The analytical expressions for the spectral density and the beam width of the astigmatic PCFT beams with circular symmetry propagating in turbulent atmosphere are derived. It is shown that the spectral density and beam width of these beams in turbulent atmosphere are h...
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ژورنال
عنوان ژورنال: British Journal of Dermatology
سال: 1895
ISSN: 0007-0963,1365-2133
DOI: 10.1111/j.1365-2133.1895.tb16829.x