Transverse drag of slow light in moving atomic vapor

Wide-bandwidth, tunable, multiple-pulse-width optical delays using slow light in cesium vapor

We demonstrate an all-optical delay line in hot cesium vapor that tunably delays 275 ps input pulses up to 6.8 ns and 740 input ps pulses up to 59 ns (group index of approximately 200) with little pulse distortion. The delay is made tunable with a fast reconfiguration time (hundreds of ns) by optically pumping out of the atomic ground states.

基于慢光和腔增强光子拖拽的桌面型高灵敏度陀螺仪

A table-top high-sensitivity gyroscope based on slow light and cavity enhanced photon drag

本文提出一种基于慢光和腔增强光子拖拽的桌面型高灵敏度陀螺仪，通过Er3+掺杂玻璃棒与Fabry-Pérot腔结合实现26 frad/s/√Hz的转动灵敏度，为精确探测地球自转微小变化及测试广义相对论效应提供了新途径。

Slow and fast light enhanced light drag in a moving microcavity

Fizeau experiment, inspiring Einstein's special theory of relativity, reveals a small dragging effect of light inside a moving medium. Dispersion can enhance such light drag according to Lorentz's predication. Here we experimentally demonstrate slow and fast light enhanced light drag in a moving optical microcavity through stimulated Brillouin scattering induced transparency and absorption. The strong dispersion provides an enhancement factor up to ~10^4, greatly reducing the system size down to the micrometer range. These results may offer a unique platform for a compact, integrated solution …

Slow Light Propagation in a Linear-Response Three-Level Atomic Vapor

We observe pulse delays of up to twenty times the input pulse duration when 200-ps laser pulses pass through a hot Rb 85 vapor cell. The pulse peak travels with a velocity equal to c/20, and the energy transmission is 5%. For pulses with linewidth greater than typical features in the atomic dispersion, pulse delay is predicted and observed for all center frequencies near resonance. Pulse advance is never observed. The measurements are in good agreement with a three-level linear-dispersion calculation. We are able to control the amount of delay by using a steady-state laser beam for optical pum…

Sub-natural width of transparency window in 85Rb vapor with D2 transition,

We study 85Rb atomic vapor for electromagnetically induced transparency (EIT) and obtain sub-natural EIT spectra at optical power higher than saturation intensity. It is shown that spectral width of transmission and intensity of EIT signal increases with intensity of optical field, which is one of the desirable features for slow light and quantum information processing. A details analysis has been done on such an atomic system.

Slow light with integrated gain and large pulse delay

We demonstrate slow and stored light in Rb vapor with a combination of desirable features: minimal loss and distortion of the pulse shape, and large fractional delay (> 10). This behavior is enabled by: (i) a group index that can be controllably varied during light pulse propagation; and (ii) controllable gain integrated into the medium to compensate for pulse loss. Any medium with the above two characteristics should be able to realize similarly high-performance slow light.

Paraxial fluid of light in hot atomic vapors

Quantum fluids of light are the photonic counterpart of Bose gases. They currently attract increasing interest since they are versatile and highly tunable systems for probing many-body physics quantum phenomena, such as superfluidity. Superfluid flow of light has already been reported in microcavity exciton-polariton condensates but clear observation of this phenomenon in cavityless systems, that is, for propagating photon fluids, remains elusive. In this thesis, we study the hydrodynamical properties of light propagating close to resonance in hot rubidium vapors. Whereas photons in air are no…

磁诱导透明-吸收及正常-异常色散特性研究：${}^{87}\text{Rb}$介质或任何J型配置原子蒸气在矢量磁场和弱共振泵作用下的表现

Magnetically Induced Transparency-Absorption and Normal-Anomalous Dispersion Characteristics of ${}^{87}\text{Rb}$ Medium or Any J-Type Configuration Atomic Vapors Subject to a Vector Magnetic Field and a Weak Resonant Pump

本研究通过分析${}^{87}\text{Rb}$介质或J型原子蒸气在矢量磁场和弱共振泵作用下的MITA/MINAD特性，揭示了频率依赖的透明吸收与正常异常色散现象，为高精度磁力计和光子功能优化提供理论支持。

Sagnac Interferometry in a Slow-Light Medium

We use a Sagnac interferometer to measure the dispersive and absorptive properties of room temperature Rubidium vapor on the D_2 line at 780.2 nm. We apply a pump beam such that the resulting Lambda system exhibits Electromagnetically Induced Transparency. Using a "biased alignment" technique we demonstrate a direct and robust method of measuring the rapid variation in the refractive index. Such a "slow-light" Sagnac interferometer is ideally suited to precision measurement applications such as magnetometry and inertial sensing.

All-Optical Delay of Images using Slow Light

Two-dimensional images carried by optical pulses (2 ns) are delayed by up to 10 ns in a 10 cm cesium vapor cell. By interfering the delayed images with a local oscillator, the transverse phase and amplitude profiles of the images are shown to be preserved. It is further shown that delayed images can be well preserved even at very low light levels, where each pulse contains on average less than one photon.

Enhanced light-vapor interactions and all optical switching in a chip scale micro-ring resonator coupled with atomic vapor

The coupling of atomic and photonic resonances serves as an important tool for enhancing light-matter interactions and enables the observation of multitude of fascinating and fundamental phenomena. Here, by exploiting the platform of atomic-cladding wave guides, we experimentally demonstrate the resonant coupling of rubidium vapor and an atomic cladding micro ring resonator. Specifically, we observed cavity-atom coupling in the form of Fano resonances having a distinct dependency on the relative frequency detuning between the photonic and the atomic resonances. Moreover, we were able to signif…

在近共振热原子蒸气中测量群速度色散

Measuring the group velocity dispersion in near resonant hot atomic vapors

该研究提出了一种通过连续波激光和慢光电探测器测量热原子蒸气中群速度色散的新方法，并在不同温度下观察到GVD的强频率依赖性。

腔磁力力学中的光拖曳效应

Light Drag in a Cavity Magnomechanics

本文首次在磁力力学系统中提出光拖曳效应，揭示非线性偶极与磁致伸缩相互作用对折射率谱的影响，并展示通过调节失谐实现光传播在超光速与亚光速之间切换，为微观尺度新型器件设计提供新思路。

Causality and information transfer in simultaneously slow- and fast-light media

We demonstrate the simultaneous propagation of slow- and fast-light optical pulses in a four-wave mixing scheme using warm potassium vapor. We show that when the system is tuned such that the input probe pulses exhibit slow-light group velocities and the generated pulses propagate with negative group velocities, the information velocity in the medium is nonetheless constrained to propagate at, or less than, c. These results demonstrate that the transfer and copying of information on optical pulses to those with negative group velocities obeys information causality, in a manner that is reminisc…