Light Shift of Coherent Population Trapping Resonances in Cesium Vapor under the Laser Field with Dual Frequency–Amplitude Modulation

IF 1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
V. I. Vishnyakov, D. V. Brazhnikov, M. N. Skvortsov
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引用次数: 0

Abstract

In this study, the light shift of coherent population trapping (CPT) resonances is studied in a miniature glass cell (~0.1 cm3) filled with 133Cs vapor. The atoms exposed to the radiation from a vertical-cavity surface-emitting laser (VCSEL). The laser current is modulated at a microwave frequency (≈4.6 GHz), which leads to the frequency modulation (FM) of output radiation. In addition, the light beam is transmitted through an electro-optic modulator (EOM), which is assembled as a Mach–Zehnder interferometer, acquiring amplitude modulation (AM). This dual (FM–AM) modulation leads to essentially nonlinear behavior of the function describing the light shift of the CPT resonance versus the total optical power in the cell. In particular, this function has an extremum that can be used to suppress the influence of small optical power variations in the cell on the stability of the CPT-based quantum frequency standard (QFS). The proposed scheme is characterized by a number of parameters such as the phase difference between the FM and AM signals as well as the bias voltage at EOM, which are additional degrees of freedom for controlling the behavior of the light shift of the CPT resonance. This can be used for the optimization of the QFS operation regime.

双频幅调制激光场下铯蒸气中相干居群俘获共振的光移
本研究在充满133Cs蒸汽的微型玻璃池(~0.1 cm3)中研究了相干居群俘获(CPT)共振的光移。暴露在垂直腔面发射激光器(VCSEL)辐射下的原子。激光电流被调制为微波频率(≈4.6 GHz),从而导致输出辐射的调频(FM)。此外,光束通过电光调制器(EOM)传输,该调制器组装成马赫-曾德尔干涉仪,获得调幅(AM)。这种双(FM-AM)调制导致描述CPT共振的光移相对于电池中的总光功率的函数本质上的非线性行为。特别是,该函数具有一个极值,可用于抑制电池中小的光功率变化对基于cpt的量子频率标准(QFS)稳定性的影响。所提出的方案的特点是许多参数,如调频和调幅信号之间的相位差以及EOM处的偏置电压,这些都是控制CPT谐振光移行为的额外自由度。这可以用于优化QFS的运行机制。
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来源期刊
CiteScore
1.90
自引率
9.10%
发文量
130
审稿时长
3-6 weeks
期刊介绍: Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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