Huang K Y, Hsu K Y, Jheng D Y, Zhuo W J, Chen P Y, Yeh P S, Huang S L
Institute of Electro-Optical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan 804, R.O.C.
Opt Express. 2008 Aug 4;16(16):12264-71. doi: 10.1364/oe.16.012264.
Cr4+:YAG double-clad crystal fiber with an uniform 10-microm core was fabricated by using a sapphire tube as a heat capacitor to stabilize the power fluctuation of the CO2 laser in the co-drawing laser-heated pedestal growth system. The uniformity of the fiber core showed a factor of 3 improvement compared to that without the use of sapphire tube. The variation of the core diameter is within the +/-1.35-degree adiabatic criterion and has a autocorrelation length of 1.7 mm. The measured propagation loss is only 0.02 dB/cm. The sapphire tube also reduces the vertical temperature gradient during the crystal fiber growth process so the 10-microm crystal core exhibits a smooth perimeter. The sapphire tube assisted system can be applied to the growth of many other optical crystal materials.
采用蓝宝石管作为热电容器，在共拉式激光加热基座生长系统中制备了具有均匀10微米纤芯的Cr4+:YAG双包层晶体光纤，以稳定CO2激光的功率波动。与不使用蓝宝石管相比，光纤纤芯的均匀性提高了3倍。纤芯直径的变化在+/-1.35度绝热标准范围内，自相关长度为1.7毫米。测得的传输损耗仅为0.02 dB/cm。蓝宝石管还降低了晶体光纤生长过程中的垂直温度梯度，因此10微米的晶体纤芯呈现出光滑的周长。蓝宝石管辅助系统可应用于许多其他光学晶体材料的生长。
