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Of barium tungstate Raman laser crystal growth and the nature of research

Author: GeWenWei
Tutor: ZhangHuaiJin
School: Shandong University
Course: Materials Science
Keywords: Barium tungstate crystal Stimulated Raman Scattering Raman laser Crystal growth Defect characterization Thermal properties Optical Properties
CLC: TN244
Type: Master's thesis
Year: 2005
Downloads: 255
Quote: 8
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Abstract


In recent years, the use of crystalline materials stimulated Raman scattering (SRS) effect created all solid-state Raman lasers Being in the limelight highlights. Use of the existing solid-state laser and Raman laser crystal laser output can be obtained from the ultraviolet to the near-infrared bands, including yellow, orange laser eye has important applications in the field of medical, radar measurements, remote sensing, and the Exploration of the Sea Safety laser. Therefore, research and development for one of the hotspots in the solid state Raman laser Raman laser crystal become a very important field of materials research. The crystals of barium tungstate (BaWO 4 ) is considered to be stable and effective Raman laser crystal one. Currently used Ba (NO 3 ) 2 , KGd (WO 4 ) 2 Raman laser crystal compared BaWO 4 crystal deliquescence, translucent band width, excellent thermal mechanical properties, single crystal Czochralski method is relatively easy to obtain large size, and whether it is in the nanosecond pumping pulses or picosecond pulsed laser having a high Raman gain. These advantages make BaWO 4 crystals become very hope to establish practical all-solid-state Raman laser Raman laser crystal. But as far as we know, the growth and the basic nature of the applications of Raman laser the large size BaWO 4 crystal (usually takes more than 5cm) has not yet reported. Therefore, this thesis BaWO 4 crystal growth, structure, defects and their basic properties of the system, and to explore its application in the Raman laser, including the following aspects of work : First, the crystal growth using 99.99% purity the BaCO 3 and WO 3 BaWO 4 polycrystalline material synthesized by the solid phase reaction, the use of melt by Czochralski method along the a-axis and c-axis successfully grown large size (Φ22mm × 80mm), no cracking, high optical quality BaWO 4 single crystal. Because the crystal growth is a complex physical - chemical processes, we combine the thermodynamics and kinetics of crystal growth system to discuss the main factors to affect the crystal growth and crystal quality. Including the preparation of the high-quality polycrystalline material and the establishment of reasonable design of the temperature field; control the growth process parameters; made of high quality seed, eliminating external factors. The causes and impact characteristics of the different factors at the same time, the corresponding solutions. Crystal components, structure and defects using X-ray fluorescence analysis were used to measure the concentration of the the Ba element and W elements in the the growth BaWO 4 single crystal in different parts of. The measurement results show that BaWO 4 , the grown single crystal is very close to the stoichiometric ratio BaWO 4 , and having good compositional uniformity.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser materials and substances
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