超窄线宽固态发射器的异常subkelvin热频偏移
X Lin1, M T Hartman1, B Pointard1
1<a href="https://ror.org/03tdef037">LNE-SYRTE</a>, Observatoire de Paris, Université PSL, CNRS, <a href="https://ror.org/02en5vm52">Sorbonne Université</a>, 75014 Paris, France.
Physical review letters
|November 15, 2024
概括
研究人员在接近290mK的化晶体中发现了一种独特的温度独立的频率转移. 这一发现为高度稳定的激光器提供了潜力,可以实现低至2×10−22.22的分数频率不稳定性.
科学领域:
- 固态物理 固态物理
- 量子光学就是一个量子光学.
背景情况:
- 兴奋剂结晶中的狭窄光谱孔对温度敏感.
- 双声波拉曼散射理论预测了一个特定的频率响应.
研究的目的:
- 研究1K以下的光谱孔的温度依赖的频率响应.
- 识别与已建立的散射理论的偏差.
- 探索频率稳定中的潜在应用.
主要方法:
- 在化晶体中测量光谱孔的频率响应.
- 温度控制在1克尔文以下.
- 分析频率变化作为温度的函数.
主要成果:
- 观察到290mK附近的两声波拉曼散射理论的显著偏差.
- 在这个系统中,我们发现了一种温度依赖的零到一级的频率转移.
- 证明了高频稳定性的潜力.
结论:
- 特定的温度调节 (约290mK) 提供了独特的光谱孔特性.
- 这种现象可以导致高频率稳定的激光.
- 在1秒内可实现~2×10−22的潜在分数频率不稳定.
相关概念视频
01:27Atomic Spectroscopy: Effects of Temperature
305
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
305
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
950
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
950