Novel non-toxic nonlinear optical crystals for deep-ultraviolet laser generation

深紫外（DUV）非线性光学（NLO）晶体在先进科学仪器的发展中起着至关重要的作用。该项目的目的是生长新型无毒DUV NLO晶体，以满足光电子领域日益增长的需求。最近开发的一种独特的高压移动溶剂浮区（TSFZ）炉将首次用于通过高压TSFZ方法生长NLO单晶，p高达150 bar。该项目将侧重于与晶体生长，器件和DUV激光器应用相关的关键问题的基础和实验研究。特别是，该项目旨在合成LiBaPO 4、LiSrPO 4、LiSr0.1Ba0.9PO4、LiSrVO 4、LiBaVO 4、Ba 4 B11 O20 F、Cs2 B4 SiO 9、Li 3Cs 2B 5 O 10等无毒晶体。将详细研究生长的单晶的结构和化学质量。将详细研究与应用相关的单晶的热性质以及它们的线性和非线性光学性质。特别强调的将是特定的缺陷和光学性能之间的相关性，这将被解决以受控的方式创建缺陷，即O和Li不足，间隙O，或质子照射。与应用的相关性将通过DUV二极管泵浦固态激光器的原型和通过获得具有6.2-7.8 eV光子能量的相干输出的DUV激光器来证明。此外，预期的结果将提供一个更好的理解结构和深紫外性能之间的关系和新的深紫外非线性光学晶体的发展。

Deep-ultraviolet (DUV) nonlinear optical (NLO) crystals play a crucial role in the development of advanced scientific instruments. The aim of the project is to grow novel non-toxic DUV NLO crystals for fulfilling the increasing demands of the optoelectronics field. A unique high-pressure travelling-solvent floating-zone (TSFZ) furnace which has been developed very recently will be utilized to grow NLO single crystals for the first time by means of the high-pressure TSFZ-method with p up to 150 bar. The project will focus on fundamental and experimental studies related to the critical issues associated with the growth of crystals, devices, and applications of DUV lasers. In particular, the project aims at non-toxic crystals of the compositions LiBaPO4, LiSrPO4, LiSr0.1Ba0.9PO4, LiSrVO4, LiBaVO4, Ba4B11O20F, Cs2B4SiO9, Li3Cs2B5O10, etc. The grown single crystals will be studied in detail regarding their structural and chemical quality. The thermal properties of the single crystals relevant for applications as well as of their linear and nonlinear optical properties will be studied in great detail. Particular emphasis will be given to the correlation between specific defects and the optical properties which will be addressed creating defects in a controlled way, i.e. O and Li deficiency, interstitial O, or proton irradiation. The relevance to application will be demonstrated by a prototype of a DUV diode-pumped solid-state laser and by obtaining a DUV laser with coherent output in photon energy of 6.2-7.8 eV. In addition, the expected results will provide a better understanding of the relationship between structure and DUV properties and of the development of new DUV NLO crystals.