Article
Physics, Multidisciplinary
Michael Peper, Johannes Deiglmayr
Summary: In this study, homonuclear Cs-2, K-2, and heteronuclear CsK long-range Rydberg molecules were formed in a dual-species magneto-optical trap for K-39 and Cs-133 by one-photon UV photoassociation. The different ground-state-density dependence of homo- and heteronuclear photoassociation rates and the detection of stable molecular ions provided clarification. Bound-bound millimeter-wave spectroscopy of long-range Rydberg molecules was utilized to access molecular states not accessible by one-photon photoassociation, serving as a benchmark for the development of theoretical models.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Joshua P. Rogers, Liam A. P. Gallagher, Danielle Pizzey, Jon D. Pritchett, Charles S. Adams, Matthew P. A. Jones, Chris Hodges, Wolfgang Langbein, Stephen A. Lynch
Summary: In this study, even-parity Rydberg exciton states in cuprous oxide were investigated using second harmonic generation (SHG) spectroscopy. The coherently generated second harmonic was successfully isolated from lower-lying free and bound excitonic states, and the quantum defects of the S and D excitonic states associated with crystal symmetries were determined. Odd-parity P and F excitonic states were also observed. The SHG spectrum was found to be cut off at a lower principal quantum number compared to conventional one-photon spectroscopy measurements.
Article
Optics
Eduardo Granados, Georgios Stoikos, Cyril Bernerd, Katerina Chrysalidis, Daniel T. Echarri, Valentin N. Fedosseev, Reinhard Heinke, Bruce A. Marsh
Summary: Tunable single-frequency lasers are important tools for studying and utilizing the electronic structure of atoms. This study demonstrates the suitability of integrated diamond Raman lasers as a high-resolution spectroscopy tool. The device can produce tunable nanosecond pulses and efficiently funnel the broad spectrum of input lasers to hard-to-access wavelength ranges.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Rosario Gonzalez-Ferez, Janine Shertzer, H. R. Sadeghpour
Summary: It is predicted that ultralong-range Rydberg bimolecules will form in collisions between polar molecules in cold and ultracold settings, with high energy and permanent electric dipole moments. The Rydberg bimolecules have rotational constants in the MHz range, allowing for microwave spectroscopy and achieving considerable orientation. These molecules hold promise for studying a special class of long-range bimolecular interactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Daniel E. Rivas, Svitozar Serkez, Thomas M. Baumann, Rebecca Boll, Marie Kristin Czwalinna, Simon Dold, Alberto de Fanis, Natalia Gerasimova, Patrik Grychtol, Bjoern Lautenschlager, Maximilian Lederer, Tomasz Jezynksi, Daniel Kane, Tommaso Mazza, Joachim Meier, Jost Mueller, Florent Pallas, Dimitrios Rompotis, Philipp Schmidt, Sebastian Schulz, Sergey Usenko, Sandhya Venkatesan, Jinxiong Wang, Michael Meyer
Summary: In this study, we demonstrate ultrafast X-ray spectroscopies for pump/probe experiments with high temporal and spectral resolution, without the need for additional photon arrival-time monitors.
Article
Optics
Zhao Fei Yun, L. Yan, Tang Zhi Ting, Ren Ao Bo, Wu Jiang
Summary: This study reports high-power multi-junction vertical-cavity surface-emitting lasers (VCSELs) that effectively suppress carrier leakage under high injection current and temperature. By optimizing the energy band structure of quaternary AlGaAsSb, a 12-nm-thick AlGaAsSb electron-blocking layer (EBL) was achieved with improved performance. The proposed EBL demonstrated enhanced output power and power conversion efficiency during room-temperature operation, while also exhibiting advantages over the original device during high-temperature operation.
Article
Physics, Applied
Hu Ge, Jin Hu, Rui Wang, Gang Zhao, Weiguang Ma, Weigen Chen, Fu Wan
Summary: This paper presents a robust approach for phase-locking, which utilizes the shape and intensity of cavity transmission profiles to identify phase deviations. The outstanding performance of this approach under severe airflow shocks demonstrates its feasibility for real-time gas detection in harsh environments.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
M. Archimi, M. Ceccanti, M. Distefano, L. Di Virgilio, R. Franco, A. Greco, C. Simonelli, E. Arimondo, D. Ciampini, O. Morsch
Summary: Experimental measurements of blackbody-radiation-induced transitions between high-lying S, P, and D Rydberg levels of rubidium atoms showed significant deviations from theory, possibly due to a modified blackbody spectrum. Installing additional microwave cavities around the cell can be used to control and suppress these transitions.
Article
Optics
Steven Ruder, Tom Earles, Christian Galstad, Michael Klaus, Don Olson, Luke J. Mawst
Summary: This study compares three types of GaAsP metamorphic buffer layers for virtual substrates in red laser diode heterostructures. The results show that using tensile-strained quantum wells on standard GaAs substrates and compressively strained quantum wells on metamorphic superlattices achieve TM-polarized and TE-polarized emission, respectively.
Article
Instruments & Instrumentation
Xingbin Wei, Zhengyi Liu, Song Zhang, Xianlin Ye, Huaijin Ren, Weimin Wang, Yingchen Wu, Mi Li
Summary: A high-efficiency and actively Q-switched Tm:YLF laser was presented in this paper, achieving a slope efficiency of 74.7% and an output power of 12.41 W in continuous-wave operation. By using a volume Bragg grating (VBG) as the output coupler and wavelength selector, the laser produced an output power of 10.65 W and a slope efficiency of 67.3% at 1.908 μm. The laser demonstrated high stability with a power fluctuation of 0.45% and central wavelength variation of 0.23 nm during continuous testing. In pulsed operation at 10 kHz, the laser achieved an average power of 10.07 W and a slope efficiency of 66.0%. This actively Q-switched Tm:YLF laser of 10-W level will serve as an ideal pump source for practical applications of compact and high-efficiency mid-infrared optical parametrical oscillators.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Wenpeng Du, Yan Gao, Brian Stankus, Xuan Xu, Haiwang Yong, Peter M. Weber
Summary: The ultrafast conformational dynamics of electronically excited N-methyl piperidine (NMP) was studied using time-resolved Rydberg fingerprint spectroscopy. The study found that intramolecular vibrational energy redistribution on a picosecond time scale leads to an equilibrium between two conformeric structures and identified the conformers as the chair and twist structures of NMP. Thermodynamic parameters for the conformeric transformation were extracted, including an enthalpy of 62 meV and an entropy of 19.70 J mol(-1) K-1 for the chair to twist reaction in the 3s excited state.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Qianying Hu, Zhen Zhan, Huiying Cui, Yalei Zhang, Feng Jin, Xuan Zhao, Mingjie Zhang, Zhichuan Wang, Qingming Zhang, Kenji Watanabe, Takashi Taniguchi, Xuewei Cao, Wu-Ming Liu, Fengcheng Wu, Shengjun Yuan, Yang Xu
Summary: Researchers demonstrate the spatial confinement and manipulation of Rydberg moire excitons through two-dimensional moire superlattices, indicating their potential for quantum technologies.
Article
Optics
Elias R. Koch, Thomas G. Seidel, Svetlana V. Gurevich, Julien Javaloyes
Summary: We theoretically study the mechanisms of square-wave formation in vertical external-cavity Kerr-Gires-Tournois interferometers in the presence of anti-resonant injection. We provide simple analytical approximations for their plateau intensities and for the conditions of their emergence. We demonstrate that square waves may appear via a homoclinic snaking scenario, leading to the formation of complex-shaped multistable square wave solutions that can host localized structures and robust bound states.
Article
Multidisciplinary Sciences
Anna Soter, Hossein Aghai-Khozani, Daniel Barna, Andreas Dax, Luca Venturelli, Masaki Hori
Summary: When atoms are placed into liquids, their optical spectral lines become broadened, making it difficult to perform high-resolution spectroscopy. However, researchers have discovered that when an exotic helium atom with an antiproton is embedded into superfluid helium, its visible-wavelength spectral line retains a sub-gigahertz linewidth. This opens up possibilities for studying other helium atoms containing antinuclei, as well as mesons and hyperons formed in superfluid helium, and determining the masses of particles.
Article
Physics, Multidisciplinary
Valentin Walther, Anders S. Sorensen
Summary: In this research, it was discovered that semiconductor Rydberg excitons, which are weakly coupled to free-space light mode, can produce strongly antibunched fields, known as quantum light. This effect is driven by a micron-scale excitation blockade between Rydberg excitons that induces pair-wise polariton scattering events. Photons incident on an exciton resonance are scattered into blue- and red-detuned pairs, which are relatively protected from absorption and dominate the transmitted light. The results show that this effect persists even in the presence of additional phonon coupling, strong nonradiative decay, and across a wide range of experimental parameters. Our findings pave the way for studying quantum statistics from weakly coupled semiconductor excitons.
PHYSICAL REVIEW LETTERS
(2023)
