华中师范大学 物理科学与技术学院, 湖北 武汉 430079
精确测量温度的变化在现代科技中有重要的意义。极其微小的温度变化通常难以直接测量。依据波片的温度变化引起o光和e光之间相位差改变这一原理, 文章搭建了基于偏振的弱值放大系统, 将这一温度变化引起的微小的相位差变化量加以放大, 并转换为易于测量的光功率的变化量, 从而间接测量出多级石英波片的温度变化量, 测量精度达到了0.0042℃, 与平衡零差探测法相比, 精度提高了9倍。
弱值 波片 温度变化 weak value wave plate temperature changes
Author Affiliations
Abstract
1 College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
2 College of Physics, Huazhong Normal University, Wuhan 430079, China
A DC current sensor based on an optically pumped atomic magnetometer is proposed. It has a high linearity in a wide operation range, since the magnetometer measures the absolute magnitude of the magnetic field produced by the current to be measured. The current sensor exhibits a high accuracy with a non-moment solenoid and magnetic shielding to suppress the influence from the environment. The absolute error of the measured current is below 0.08 mA when the range is from 7.5 mA to 750 mA. The relative error is 5.54 × 10?5 at 750 mA.
current sensor atomic magnetometer high accuracy Chinese Optics Letters
2020, 18(3): 031202
1 江汉大学物理与信息工程学院, 武汉 430056
2 华中师范大学物理系, 武汉 430079
研究了Tavis-Cummings模型中光场存在相位损耗时,原子光场系统线性熵、原子线性熵和光场线性熵的时间演化特性,讨论了光场的不同量子统计性质、不同的衰变常数和两原子的初始状态对各线性熵的影响。结果表明:光场的不同量子统计性质使得系统线性熵、原子线性熵和光场线性熵均发生明显改变。系统线性熵的演化与原子的初始状态无关,而原子线性熵的演化较强地依赖于原子的初始状态,但与腔场的相位损耗无关。
量子光学 Tavis-Cummings模型 相位损耗 线性熵 压缩真空场
1 Department of Physics, Huazhong Normal University, Wuhan 430070
2 CCAST (World Laboratary), Beijing 100080
3 Department of Physics, Hubei Colloge of Education, Wuhan 430060
system of two atoms interacting with a single-mode atomic coherent trapping phase properties of the field Chinese Journal of Lasers B
1992, 1(3): 221