Grow Of Mg-Doped Lithium Neonate Crystal And Study Of Related Quasi-Phase Matching Devices

The concept of quasi-phase matching has been proposed for over half of a century, but in practical applications, in particular the commercialization of products, it doesn't progress significantly, which is mainly limited to quasi-phase-matched materials. In the past, preparation of this kind of materials was focused on the structure of the material in the same ingredients: Lithium tantalite, lithium neonate (CLN), potassium titanic phosphate (KTP) and other materials, but the main problems of these materials are the coercive field is higher, and the optical damage threshold is lower. In recent years, the main work has been focused on improving the shortcomings of these materials themselves, such as the growth of near-stoichiometric lithium tantalite and lithium neonate (SLT, SLN) is to improve key aspects of material performance, Crystal damage threshold raised l-2.coercive field is decreased by an order of magnitude. This paper looks for a relatively simple and practical way to grow Mg-doped lithium neonate crystal with a lower cost and the same composition, and produces a quasi-phase-matching device.This experiment in the appropriate temperature field and temperature gradient conditions, applying a better crystal Czochralski growth process parameters, better composition Mg-doped lithium neonate crystals (CLN) with no macro-defects and well optical homogeneity were prepared and their performance were tested, and the crystals were treated by single-domain processing. In the field of the quasi-phase matching devices, this paper carried out the following works: First of all, the strengths and weaknesses of the phase matching and quasi-phase matching were expounded in theory, combined with the actual characteristic indicators of CLN crystal, laser periodic structure with output of 3-5μm and the corresponding tuning methods were designed; the process of CLN crystal such as nucleation of domain structure, expansion and so on were analyzed, periodically poled devices were prepared, and the corresponding multiplier tests were carried out.