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We propose a novel scheme for asymmetric light diffraction of a weak probe field into a one-dimensional (1D) and two-dimensional (2D) lattice occupied with cold atoms. The atoms are driven into the double lambda-type configuration by a standing wave, two coupling laser fields and a probe. Our study suggests the proposed scheme is capable of forming an asymmetric diffraction as a result of inducing optical paritytime symmetry in both 1D and 2D lattices. Moreover it is demonstrated that the asymmetric pattern of diffraction can be dynamically manipulated by means of adjusting the relative phase. Furthermore it is revealed that in the case of 1D lattice (grating), variation of the intensities of the coupling fields has a significant impact on the intensity of diffraction orders in the uneven distribution of diffraction.

In this paper, we discus about production Hydrogen for industrial and laboratories. We will discuss about methods of production Hydrogen and exquisite in electrolysis Power Acids. In this paper, compare some methods and materials. We prefer Sulfuric Acid. For electrolysis Sulfuric Acid, we need electrode. The material of electrode must refractory in corrosion by Sulfuric Acid. This material is alloy from palatine and other material. The physical face of electrode is too important and discus in this paper.

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