在1550 nm处,的温度依赖的光弹性系数
Johannes Dickmann1,2, Jan Meyer3,4, Mika Gaedtke3,4
1Institute for Semiconductor Technology, Technical University of Braunschweig, Hans-Sommer-Str. 66, 38106, Brunswick, Germany. j.dickmann@tu-braunschweig.de.
Scientific reports
|November 9, 2023
概括
单晶中的光弹性系数随温度和晶体方向而变化. 随着温度降至5K,它的绝对值增加了40%,这对光学机械至关重要.
科学领域:
- 固态物理 固态物理
- 视觉机械学 视觉机械学
- 材料科学是一种材料科学.
背景情况:
- 光弹性效应描述了材料的折射率在机械应力下如何变化.
- 了解中这种效应对于开发先进的光机械设备至关重要.
研究的目的:
- 为了研究单晶中光弹性系数的温度依赖性.
- 为了比较 (100) 和 (110) 方向的光弹性特性.
- 为制冷光学机械应用提供相关数据.
主要方法:
- 用于确定光弹性系数的极度测量方案.
- 在1550 nm波长的广泛温度范围 (5300 K) 上进行的测量.
- 采用了高灵敏度技术,并自动校正光束路径以提高精度.
主要成果:
- 测量了具有 (100) 和 (110) 方向的的光弹性系数.
- 结果与室温数据非常一致 ([公式:参见文本] 1/Pa 为 (100) 方向).
- 在方位之间观察到光弹性 (~[公式:见文本]) 的显著差异.
- 随着温度降至5K,绝对光弹性系数增加了40%左右.
结论:
- 的光弹性属性强烈依赖温度和特定于方向.
- 这些发现对于设计在冷温度下运行的精密光机械系统至关重要.
- 数据支持引力波探测器和量子传感器中的应用.
相关概念视频
02:26Photoelectric Effect
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
01:20Types of Semiconductors
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...