Some factors that lead to dark fibers due to the quality of glass and geometric defects of glass tube is analyzed, and raises some relevant improving measures, which takes great effects in reducing the rate of dark fibers. Besides, the paper renders some useful parameters of optical fiber image arrays. Using scanning electron microscopy and atomic force microscopy to characterize the micro-structure of exhibiting defects in optical fiber arrays , and to clarify the main causes of defect formation, and the relationship between bubbles and stones inside the optical fiber arrays and the formation of defects is verified and analyzed. Use a fiber optic imaging component defect detector to obtain the changes in the average quantity and distribution of defects, the influence of stretching process on the quantity and distribution of defects in the fiber bundles analyzed. The experimental results show that the low defect materials can be produced by simultaneously improving the surface quality of the core glass rod and optimizing the stretching temperature. The formation mechanism of defect formation within in the optical fiber arrays and the defect control techniques can improved fiber optic imaging components.
The laser properties of 1064 nm pulse laser is investigated by optimizing mirror curvatures of resonant cavity. When the curvature of the laser rod pumping surface is -2000mm, the laser operating stability region of different mirror curvature radius is simulated, the simulation results show that the fundamental mode radius is increasing with a decrease in radius of mirror curvature. The two mirror curvatures are finally optimized to 1300 mm, 1500 mm, 3000 mm and 4000 mm, the fundamental mode radius is 0.91 mm, 0.71 mm, 0.53 mm, 0.50 mm, respectively. The experiments results show that the pump end face of the crystal rod is damaged under pumping energy of 451W when the radius of curvature is 4000 mm, and the maximum static state energy is 77.5W under the pump energy of 415W. The pump end face of the crystal rod is damaged under pumping energy of 470W when the radius of curvature is 3000 mm, and the maximum static state energy is 85.2W under the pump energy of 451W. The dynamic state energy with the mirror curvature of 1500 mm is larger than that with the mirror curvature of 1300 mm under the same pump energy and the dynamic state energy is 86.6 mm and 89.5 under the pump energy of 489W with the curvature of the output coupled mirror of 1300 mm and 1500 mm. The damage of the pump end face of the crystal rod is not appear with the curvature of the output coupled mirror of 1500 mm while pumping energy is up to 541W, and the static state energy is 154.2 mJ and the dynamic state energy is 92.4 mJ under the pump energy of 541 mJ corresponding to the dynamic static ratio of 60%. Optimization of curvatures radius of cavity mirrors is carried out to reduce the power density in cavity, which can provide an effective technical means for obtaining high-energy end-pumped Q-switched laser output.
High energy 1064 nm Q-switched laser output is obtained by LD vertical array end pumping Nd:YAG. For different divergence angles of fast axis and slow axis of LD array, aspheric lens and the glass rod is used for beam shaping of LD array. The results show that light intensity distribution of output laser is very sensitive to the structure of the beam shaping system, which can be controlled by adjusting the spatial position of pumping, such as the distance between the aspheric lens and the face of the glass rod, and the approximate Gaussian beam was obtained without damage. When the distance between the aspheric lens pair and the face of the glass rod is 16mm, a 1064 nm Q-switched laser with single pulse energy of 60.4 mJ under the pump energy of 489 mJ, corresponding to optical conversion efficiency of 12.4%.
High energy 1064 nmQ-switched laser output is obtained by LD vertical array end pumpingNd:YAG. For different divergence angles of fast axis and slow axis of LD array, aspheric lens and the glass rodis used for beam shaping of LD array. The results show that light intensity distribution of output laser is very sensitive to the structure of the beam shaping system, which can be controlled by adjusting the spatial position of pumping, such as the distance between the aspheric lens and the face of the glass rod, and the approximate Gaussian beam was obtained without damage. When the distance between the aspheric lens pair and the face of the glass rod is 16mm, a 1064 nm Q-switched laser with single pulse energy of 60.4 mJ under the pump energy of 489 mJ, corresponding to optical conversion efficiency of 12.4%.
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