Magneto-optical polarization rotation in a ladder-type atomic system for tunable offset locking

驱动啁啾振荡器中的量子与经典锁相跃迁

Quantum versus classical phase-locking transition in a driven-chirped oscillator

讨论了啁啾频率微扰驱动下非线性振子的经典和量子锁相跃迁。根据无量纲参数$% P_{1}=ε/\sqrt{2m\hbar ω_{0}α}$和$P_{2}=(3\hbar β)/(4m\sqrtα)$（$ε,$、$α,$、$β$和$ω_{0}$是驱动幅度、频率啁啾率、非线性参数和振荡器的线性频率）分析了不同的极限。结果表明，对于$P_{2}\ll P_{1}+1$，通过线性共振$P_{1}$以上的阈值产生经典的自共振（AR）的系统中，即使在量子基态开始。相反，对于$% P_{2}\gg P_{1}+1$，跃迁涉及量子-机械能爬梯（LC）。计算了在AR和LC极限下$P_{1}$的锁相跃迁阈值及其宽度。通过求解能量基中的薛定谔方程和相空间中的维格纳函数对理论结果进行了验证。

Locking Multi-laser Frequencies to a Precision Wavelength Meter: Application to Cold Atoms

We herein report a simultaneous frequency stabilization of two 780-nm external cavity diode lasers using a precision wavelength meter (WLM). The laser lock performance is characterized by the Allan deviation measurement in which we find $σ_{y}=10^{-12}$ at an averaging time of 1000 s. We also obtain spectral profiles through a heterodyne spectroscopy, identifying the contribution of white and flicker noises to the laser linewidth. The frequency drift of the WLM is measured to be about 2.0(4) MHz over 36 hours. Utilizing the two lasers as a cooling and repumping field, we demonstrate a magneto-…

A tunable Doppler-free dichroic lock for laser frequency stabilization

We propose and demonstrate a laser frequency stabilization scheme which generates a dispersion-like tunable Doppler-free dichroic lock (TDFDL) signal. This signal offers a wide tuning range for lock point (i.e. zero-crossing) without compromising on the slope of the locking signal. The method involves measurement of magnetically induced dichroism in an atomic vapour for a weak probe laser beam in presence of a counter propagating strong pump laser beam. A simple model is presented to explain the basic principles of this method to generate the TDFDL signal. The spectral shift in the locking sig…

Nanotesla-level, shield-less, field-compensation-free, wave-mixing-enhanced body-temperature atomic magnetometry for biomagnetism

We report an optical inelastic-wave-mixing-enhanced atomic magnetometry technique that results in nT-level magnetic field detection at temperatures compatible with the human body without magnetic shielding, zero-field compensation, or high-frequency modulated phase-locking spectroscopy. Using Gaussian magnetic pulses that mimic the transient magnetic field produced by an action potential on a frog's nerve, we demonstrate more than 300,000-fold (550-fold) enhancement of magneto-optical rotation signal power spectral-density (power amplitude) over the conventional single-beam $Λ-$scheme atomic m…

A single-laser alternating-frequency magneto-optical trap

In this paper, we present a technique for magneto-optical cooling and trapping of neutral atoms using a single laser. The alternating-frequency magneto-optical trap (AF-MOT) uses an agile light source that sequentially switches between cooling and repumping transition frequencies by tuning the injection current of the laser diode. We report on the experimental demonstration of such a system for 87Rb and 85Rb based on a micro-integrated extended cavity diode laser (ECDL) performing laser frequency jumps of up to 6.6 GHz with a tuning time in the microsecond regime and a repetition rate of up to…

Suppression of nonlinear Zeeman effect and heading error in earth-field-range alkali-vapor magnetometers

The nonlinear Zeeman effect can induce splitting and asymmetries of magnetic-resonance lines in the geophysical magnetic field range. This is a major source of "heading error" for scalar atomic magnetometers. We demonstrate a method to suppress the nonlinear Zeeman effect and heading error based on spin locking. In an all-optical synchronously pumped magnetometer with separate pump and probe beams, we apply a radio-frequency field which is in-phase with the precessing magnetization. In an earth-range field, a multi-component asymmetric magnetic-resonance line with ? 60 Hz width collapses into …

光注入二极管激光器周期一振荡原子物理学实验的微波边带

Microwave sidebands for atomic physics experiments by period one oscillation in optically injected diode lasers

我们发现，在光注入的二极管激光器的非线性动力学导致频率可调谐的微波边带，适用于原子物理学实验。我们证明了边带的适用性，在实验中，铷原子的磁光捕获的陷阱和再泵浦光频率来自一个光注入激光器。我们发现，在注入频率和边带频率的注入激光的光谱线宽变窄。强光注入导致频率锁定，我们发现一个完整的线宽转移从主从。进一步的应用进行了讨论。

利用磁光陷阱实现连续云位置光谱学

Continuous cloud position spectroscopy using a magneto-optical trap

该研究提出一种连续光谱技术，实现低于自然跃迁线宽的频率灵敏度，同时保持数百倍更大的锁定范围，通过优化频率梳实现高精度频率参考。

一种Mz型光学泵磁强计的优化与向量化

Optimization and vectorization of a Mz-type optically-pumped Rubidium magnetometer

本文提出一种Mz型光学泵铷磁强计，通过优化泵光强度和射频磁场，提升灵敏度至22.9 pT/Hz^{1/2}，并利用三轴调制和频域解调实现矢量磁场检测。