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首页> 外文会议>Advanced Lassers and Systems; Proceedings of SPIE-The International Society for Optical Engineering; vol.6731 >Cr~(3+) doped NaAl(WO_4)_2 crystal as a new broadband laser material
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Cr~(3+) doped NaAl(WO_4)_2 crystal as a new broadband laser material

机译：Cr〜（3+）掺杂NaAl（WO_4）_2晶体作为新型宽带激光材料

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摘要

The growth conditions of single crystals of the new double tungstate of sodium and aluminum, NaAl(WO_4)_2 have been investigated. Data have been obtained on the concentration and temperature regions of crystallization of this compound in the system Na_2O-Al_2O_3-WO_3. Nontsoichiometric high-temperature solutions with very low crystallization temperatures, low viscosity and absence of volatility have been found and used for growing pure and differently Cr~(3+)-doped single crystals of NaAl(WO_4)_2 by the top seeded solution growth (TSSG) slow cooling. technique. The main defects of the crystals obtained have been established, the reasons for their appearance analysed and single crystals free from inclusions were grown. Measurements of the optical characteristics of samples with chromium concentrations in the range 1.4× 10~(19)-1.3× 10~(20) atoms/cm~3 were carried out. Absorption and luminescence spectra of Cr~(3+): NaAl(WO_4)_2 were obtained at temperatures between 6 and 300 K and the temperature dependence of the Cr~(3+) luminescence lifetime was established. The Dq/B value found indicates that Cr~(3+):NaAl(WO_4)_2 belongs to the intermediate field site crystals. The results show that the new crystal is a good candidate for broadband laser applications.
机译：研究了钠和铝的新型双钨酸钠NaAl（WO_4）_2的单晶生长条件。已获得有关该化合物在Na_2O-Al_2O_3-WO_3系统中结晶的浓度和温度区域的数据。已发现具有低结晶温度，低粘度和无挥发性的非化学计量高温溶液，并用于通过顶部晶种溶液生长来生长纯净的和不同Cr〜（3+）掺杂的NaAl（WO_4）_2单晶（ TSSG）缓慢冷却。技术。确定了获得的晶体的主要缺陷，分析了其外观的原因，并生长了无夹杂物的单晶。测定铬浓度在1.4×10〜（19）-1.3×10〜（20）原子/ cm〜3范围内的样品的光学特性。在6〜300 K之间获得了Cr〜（3+）：NaAl（WO_4）_2的吸收光谱和发光光谱，建立了Cr〜（3+）发光寿命的温度依赖性。发现的Dq / B值表明Cr〜（3 +）：NaAl（WO_4）_2属于中间场位晶体。结果表明，这种新晶体是宽带激光器应用的良好选择。

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