2006-11-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/665539摘要：Zinc Germanium Phosphide (ZnGeP2簡稱ZGP)是在中紅外區段(3-5)最佳的非線性光學相匹配晶體，除了高的非線性係數(d36 = 75pm/V)，寬的相匹配範圍外，更具有寬廣的紅外線透明區(630nm~13μ)，強的機械性質，及高的抗光阻值。在紅外光固態雷射的應用，例如OPO(optical parametric oscillators) 、DFG(different frequency generation)、混頻、倍頻等，相當有潛力。其它的應用，更包括分子光譜、大氣偵測及固態物理研究等。 雖然目前ZGP已經可以由傳統的長晶方法來製備，但因其具有大的非均相膨漲係數及本質缺陷，尤其在950℃處的α / β相轉換，要得到大且無劈裂，具高穿透係數及光阻能力的ZGP單晶，卻不是容易的工作。最近幾年，在合成方法的進步及利用透明爐的水平式溫梯法，已使得ZGP生長的品質及良率已大幅提升，但要合成與生長高品質的ZGP單晶仍然十分不易。在過去研究文獻中，對合成反應動力、生長觀察、及界面控制的資訊仍然十分欠缺。因此，我們將自行設計一套三段可程式化溫度控制之透明高溫爐，具<br> Abstract: Zinc germanium phosphide (ZnGeP2-ZGP) with a pseudodirect band gap of 2.1eV at room temperature has been known as one of the most promising nonlinear optical materials. This has the attractive transparency range from 630nm to 13mm. In view of its substantial positive birefringence of 0.36%, ZGP as a suitable material for non-linear optical applications in the infrared, e.g., the fabrication of optical parametric oscillators (OPO)、DFG (different frequency generation)and harmonic generation based on powerful infrared laser sources. Because of these attractive appltcaions, growing high-quality ZPG single crystals are important. Because of the high expansion coefficient, it is not easy to grow a crack-free ZGP single crystal having high transparency and optical damage threshold. In recent years, some successes have been reported using the horizontal gradient freeze technique. However, there are still many problems in both synthesis and crystal growth. On ther other hand, very few information about its synthetic kinetics and the control of the interface, which is crucial to the crystal quality, during crystal growth has been reported. In this proposal, we plan to set up a transparent furnace with three heating zones. The length of the heating zones is designed long enough for both synthesis and crystal growth. The middle zone is designed as a booster used for the interface control during crystal growth. In addition to the system design and setup, optimal conditions for the synthesis and crystal growth will be investigated through the control of stoichiometry and the growth interface, as well as the crcible materials. The synthesis and crystal growth will be onducted in the sample ampoule, so that the production of single crystals could be greatly simplified. The grown crystal will be cut and publised for further characterizations. They include the measurements of absorption spectrum, refractive indices, and the damage threshold. Finally the effect of annealing on the crystal quality will be further investigated.單晶生長紅外線非線性光學透明高溫爐Single crystal growthinfraredNLOtransparent firbace