N51-type Nd-doped phosphate laser glass is recently developed at Shanghai Institute of Optics and Fine Mechanics, China, especially for high-power laser applications. One multiphysics model is utilized to simulate the thermal recovery process of a single large-sized N51 amplifier, 810×460×40 mm3 slab with 12 mm thick edge cladding. The change of the average temperature with time, as well as the temperature at five points located at the center, long and short edge side, corner of the laser slab, and center of the edge cladding, are numerically simulated and discussed. On the thermal recovery, the slab equilibration time and the self-equilibration time are determined by the average temperature and the maximum temperature difference with a function of recovery time, respectively. For the whole slab, the temperature distribution, temperature gradient distribution, and thermal stress distribution during the thermal recovery process after a single but strong pumping are also numerically simulated by the transient-analysis method. Based on these numerical data of the N51 laser slab, it is suggested that N51 would be applied in high power laser systems with a better thermal recovery performance, as well as a higher stimulated emission cross section.
In this paper, the theory model in which both the two-center material equations and two-dimensional two-wave coupled equations were solved jointly based on two-center holographic recording method is presented to analysis the dynamic formation of the crossed-beam photorefractive gratings in two doped LiNbO3 crystals. The influence of the light intensity on the basic holographic properties of the crossed-beam photorefractive gratings in LiNbO3:Fe:Mn crystals is explored. The numerical simulation results are presented. The investigation yields quantitative predictions of the expected behavior of the dynamics of these gratings, which can be useful for the design of finite boundary photorefractive holographic optical elements.
A Bragg grating focusing device composed of electro-optically induced refractive index grating in periodically poled lithium niobate was designed for integrated optics systems. The device are induced and controlled by the application of an external electric field. The theoretical analysis of the proposed optical device is carried out using two-dimensional coupled wave theory. The focusing properties and the diffraction intensity are investigated at the focal plane. It is shown that the designed device has good performance of focusing when a plane wave incidents on it at a certain angle. This type of Bragg diffraction devices can be act as a focusing lens and will have many potential applications such as in integrated optics and opto-electronics.
In this paper, effect of polarization of light on photorefractive grating formulation with any light modulation in birefringent photorefractive material is studied in detail. The diffraction efficiency with various modulations and different polarization mode is calculated. Theoretical analytic results are presented. It is shown that both the ratio of the initial intensity and the incident angle of the writing waves are selective when the polarization of mode of the readout wave and that of diffracted wave are different. But these two recording conditions are not selective for the isotropic diffraction. On the other hand, it is also found that the length of the grating is selective for anisotropic diffraction.
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