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中的固态光学冷却， 半导体 该研究提案的目标是研究和实施固态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量泵浦波长并将其作为较高能量的反斯托克斯（AS）辐射发射来去除声子能量的技术。我们以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形状，使用两种波长通过结合激发态吸收和AS发射来提高除热效率，以及通过使用光纤的芯和包层区域的选择性掺杂来冷却激光器等。我们已经开始了初步的光谱研究，通过与海军研究实验室，美国，和比萨大学的基准冷却合作获得的样品。有了这些材料，我们还将尝试通过我们最近提出的一种新的超辐射方案来提高冷却速率。利用这种技术，我们相信我们将克服激光冷却固体的一个主要缺点，即仅使用低声子材料的限制，并且通过将冷却速率提高一百倍，首次使用半导体。除了各种稀土掺杂的晶体和玻璃，有了这一突破，我们将能够探索新的材料，以获得更好的效率，例如量子点和纳米颗粒在玻璃质基质材料。该研究将对HQP的培训产生非常强大的多学科影响，并通过允许用于冷却应用的新设备在加拿大进行商业化，例如，用于高功率LED照明的极端重要行业的散热。

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.