SOCRATES; Solid state optical cooling with rare earth and quantum doT dopEd glasses and crystals and in semiconductors

苏格拉底：稀土和量子点掺杂玻璃和晶体以及In的固态光学冷却 半导体 该研究计划的目标是研究和实施固体材料激光诱导冷却的新技术。激光诱导固体冷却是一种通过将声子能量添加到低能泵浦波长并以高能反斯托克斯(AS)辐射的形式发射出去来去除声子能量的技术。我们之前的工作提出了几种有效去除能量的理论技术，例如通过优化样品的几何结构，使用两个波长通过结合激发态吸收和As发射来提高热量去除的效率，以及通过使用选择性掺杂光纤的芯和包层区域来冷却激光器等。我们已经开始对通过与美国海军研究实验室和比萨大学合作获得的样品进行初步的光谱研究，以作为冷却的基准。有了这些材料，我们还将尝试通过最近提出的一种新的超辐射方案来提高冷却速度。使用这项技术，我们相信我们将克服固体激光冷却的一个主要缺点，即仅使用低声子材料的限制，以及首次使用半导体的限制，通过将冷却速度提高100倍。除了各种稀土掺杂晶体和玻璃外，有了这一突破，我们将能够探索出效率更高的新材料，例如玻璃基质材料中的量子点和纳米粒子。这项研究将对HQP的培训以及加拿大的商业产生非常强大的多学科影响，因为它允许新的设备用于冷却应用，例如，在极其重要的高功率LED照明行业中的散热。

SOCRATES: Solid state Optical Cooling in RAre earth and quantum doT dopEd glasses and crystals and in Semiconductors The objectives of the research proposal are to study and implement novel techniques for laser induced cooling of solid-state materials. Laser induced cooling of solids is a technique to remove phonon energy by adding it to a low energy pump wavelength, and emitting it as higher energy anti-Stokes (AS) radiation. Our previous work proposed several theoretical techniques for the efficient removal of energy, for example by optimising the geometry of the sample, using two wavelengths to increase the efficiency of heat removal by combining excited state absorption and AS emission, and cooling of lasers by the use of selective doping of the core and cladding regions of an optical fibre, amongst others. We have begun preliminary spectroscopic studies of samples acquired through collaboration with Naval Research Laboratories, USA, and the University of Pisa to bench-mark cooling. With these materials, we will also attempt to enhance the cooling rate by a new scheme of superradiance, which we have proposed recently. Using this technique, we believe we will overcome a major shortcoming in laser cooling of solids, i.e. the restriction for using only low phonon materials, and also semiconductors for the first time, by enhancing the rate of cooling a hundred fold. In addition to a variety of rare-earth doped crystals and glasses, with this breakthrough, we will be able to explore new materials for better efficiency, such as quantum dots and nano-particles in glassy host materials. The research will have a very strong, multidisciplinary impact on the training of HQP and also commercially in Canada by allowing new devices for cooling applications, for example, for the heat removal in extremely important industry of high power LED lighting.