Preparation of Cu^+ tunable glass laser

为了研制基于Cu2+离子近450 mm蓝光发射的固体可调谐激光器，建立了在CuProus状态下制备只含Cu2+离子的钙磷玻璃的条件。在常压下熔炼的含铜玻璃，在真空下与硅粉一起被粉碎并密封在石英玻璃瓶中，然后在1100oC下重新熔化72h。获得均匀的含铜离子玻璃的最佳硅铜比约为0.25。过多的硅引入会导致CuO胶体的形成，而Si/Cu=0.25以下的少量硅不足以减少常压熔炼过程中生成的铜离子。分别以Nd-YAG激光的FHG发射为泵浦光，以Ar-离子激光为探头，在3 mm宽、3 mm高、15 mm长的矩形玻璃样品上，对制备的含铜玻璃的受激辐射增益进行了检测。实验结果表明，用高倍频辐射的强紫外光照射玻璃，在玻璃中形成缺陷，阻碍了铜离子氧化成铜态发射的增益。通过用铝取代部分钙离子来减少玻璃中非桥氧的形成，可以减少这种缺陷的形成，从而得出结论：制备没有非桥氧的玻璃是利用铜离子制作固体可调谐激光器的关键。符合这一条件的玻璃建议是在硼磷酸盐和铝磷酸盐混合体系中。

In orter to develop a solid state tunable laser based on the blue emission of the wavelength near 450mm from Cu+ions, the conditions for the preparation of calcium phosphate glass containing copper ions only in the cuprous state has been established. A copper containing glass melted in an ambient atmosphere was pulverized and sealed in a silica glass ampule under vacuum together with silicon powder, and then re-melted at 1100oC for 72h. The optimum Si/Cu ratio to obtain a homogeneous glass with Cu+ions was in the vicinity of 0.25. The introduction of too much amount of silicon resulted in the formation of colloid of CuO, while small amount of silicon below Si/Cu=0.25 was not sufficient to reduce cupric ions formed during the melting under ambient atmosphere. The examination of the gain by the stimulated emission from the prepared Cu+-containing glass was carried out on a rectangular glass sample of 3mm wide, 3mm hihg and 15mm in length having three surfaces finished in the optical flat using FHG emission of Nd-YAG laser as pumping light and Ar-Ion laser beam as a probe, respectively. It turned out by the test that the irradiation of a strong UV light of FHG emission of Nd-YAG laser leads to the formation of defects in the glass, which resulted in the hindrance of the gain of the emission due to oxidation of cuprous ions into cupric state. The formation of such defects could be reduced by reducing non-bridging oxygen in the glass by replacing a part of calcium by aluminum, which lead to conclusion that the preparation of a glass without non-bridging oxygen is essential to the fabrication of a solid state tunable laser using Cu+. The suggested glass to meet this condition is in the mixed system of boro-phosphate and alumino-phosphate.