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Expressions for focused Gaussian Schell-model (GSM) beams are derived and used to study the annihilation and subwavelength structures of phase singularities in the focal region, and to compare with the case of fully coherent Gaussian beams. It is found that the truncation parameter δ and normalized coherence length ε both affect the presence and spatial distribution of phase singularities in the focal...
The nanos gene encodes a zinc-finger protein which is required for the migration and differentiation of primordial germ cells as well as for their fate maintenance. In this study, a 1913bp nanos gene was cloned and characterized in silkworm (Bombyx mori). RT-PCR and Western blot analysis showed that the nanos was expressed in developing embryos and various silkworm larval tissues. The expression patterns...
A new non-periodic structure of coaxial Bragg fiber has been optimum designed to improve the guided out-flux transmit characteristics. The number of cladding medium layers can be reduced by the reasonable simplify design for the non-periodic cladding structure coaxial Bragg fiber, it can achieve better field confinement than Bragg fiber in the same cladding layers structure. The structure simplification...
A new aspheric surface pre-collimation lenses system for the optical antenna of space laser communication has been optimum designed by optical design software CODE-V. Meanwhile, a Cassegrain antenna with aspheric surface has been designed. By the use of Visual C++, an optical system design software has been set up to analyze optical antenna for the space laser communication system, and some simulation...
In this paper, semiconductor laser beam collimation lenses system which can be used in space laser communication has been optimum simulated and designed. Some new design methods based on the geometrical optical theory have been discussed in details, and an ideal aspheric surface design method has been given. The optical system has been further simulated by optical design software CODE-V. The collimation...
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