Article
Instruments & Instrumentation
Yige Lin, Qiang Wang, Fei Meng, Shiying Cao, Yuzhuo Wang, Ye Li, Zhen Sun, Bingkun Lu, Tao Yang, Baike Lin, Aimin Zhang, Fang Fang, Zhanjun Fang
Summary: The Sr-87 optical lattice clock at NIM was reported with various improvements made since its first evaluation in 2015. By carefully evaluating systematic frequency shifts, a total relative uncertainty of 2.9 x 10(-17) was achieved, with an absolute frequency measurement of 429, 228, 004, 229, 873.07(0.13) Hz and a relative uncertainty of 3.1 x 10(-16) referenced to primary and secondary frequency standards by BIPM.
Article
Instruments & Instrumentation
Huidong Kim, Myoung-Sun Heo, Chang Yong Park, Dai-Hyuk Yu, Won-Kyu Lee
Summary: This study reports a 14-month measurement of the absolute frequency of the S-1(0)-P-3(0) transition in the Yb-171 optical lattice clock at KRISS, with high accuracy and good agreement with other reports. The determined absolute frequency is expected to contribute to the future update of the CIPM recommendation frequency of the secondary frequency standards.
Article
Instruments & Instrumentation
Bin Jian, John Bernard, Marina Gertsvolf, Pierre Dube
Summary: We have improved the absolute frequency measurement of a single trapped strontium ion's 5s2S1/2-4d2D5/2 optical transition using a Global Positioning System (GPS) link to the SI second. The systematic uncertainty of the optical clock has been reduced from 1.5 x 10(-17) to 1.2 x 10(-17) compared to previous measurements. The traceability to the SI second through International Atomic Time was achieved using a GPS link and the Precise Point Positioning method. The measured frequency of the 88Sr+ ion 5s2S1/2-4d2D5/2 transition is 444779044095485.49(19) Hz, with the uncertainty reduced by almost a factor of four compared to previous measurements.
Article
Instruments & Instrumentation
Wei Wei, Alonso Castro
Summary: In this study, cavity ring-down spectroscopy (CRDS) was successfully applied to study the Er-166 isotope in an atomic beam. By using a tuned diode laser and a high-finesse ring-down optical cavity, absorbance measurements of erbium atoms were conducted with high precision. This work demonstrates the ability to study dilute atomic beams of refractory materials accurately using CRDS.
APPLIED SPECTROSCOPY
(2023)
Article
Engineering, Electrical & Electronic
Wen Xiao, Chunfu Cheng, Yiwen Ou, Yuanchang Zhu, Jie He, Zuozhun Xie
Summary: A fiber cavity ring-down (FCRD) displacement sensor with picometer resolution was developed using frequency-shifted interferometry (FSI). By combining FCRD with FSI, the proposed sensor achieves space-domain measurement and reduces the requirements of the laser source and detector, resulting in low cost and high sensitivity.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Matteo Barbiero, Davide Calonico, Filippo Levi, Marco G. Tarallo
Summary: We report on the realization of a new compact strontium optical clock using a 2-D magneto-optical-trap (2D-MOT) as cold atomic source and a multi-wavelength cavity as the frequency stabilization system. The clock operation is performed without atomic signal normalization, enabling low-noise operation. Stability tests and preliminary accuracy budget demonstrate the feasibility of the system.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Optics
Zhongan Zhao, Zhenxu Bai, Duo Jin, Yaoyao Qi, Jie Ding, Bingzheng Yan, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: In this paper, a calculation method for processing the output of a delayed self-heterodyne setup using a short length of delay fiber is presented to determine laser linewidth. The method avoids the introduction of 1/f noise and demonstrates high calculation accuracy and flexibility based on experimental results.
Article
Physics, Multidisciplinary
Daniel Benedicto Orenes, Robert J. Sewell, Jerome Lodewyck, Morgan W. Mitchell
Summary: This study proposes a multimeasurement estimation protocol for quantum nondemolition measurements in optical lattice clocks. The protocol utilizes correlations between multiple nondestructive measurements to improve clock stability and optimize experimental parameters.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Analytical
Coralie Elmaleh, Fabien Simon, Jean Decker, Julien Dumont, Fabrice Cazier, Marc Fourmentin, Robin Bocquet, Arnaud Cuisset, Gael Mouret, Francis Hindle
Summary: The development of cavity based infrared spectroscopy techniques, particularly cavity ring-down spectroscopy, has been successful for sensitive measurements. However, the construction difficulty of high finesse cavities has limited its application for THz frequencies. By using a corrugated waveguide and photonic mirrors, we have achieved finesse values of 3500. This has allowed us to measure the absorption of various gases and samples, demonstrating good agreement with a certified gas analyser for industrial samples.
Article
Environmental Sciences
Emily Rose Rees, Andrew R. Wade, Andrew J. Sutton, Kirk McKenzie
Summary: Future space-based geodesy missions are expected to rely on laser ranging as their primary instrument, requiring the development of a technique that provides long-term frequency stability. This paper presents a technique to track frequency changes using measurements of the optical cavity's free spectral range, calibrated to absolute frequency using an atomic reference. An on-ground calibration approach has also been validated to determine the absolute frequency in orbit.
Article
Chemistry, Analytical
Shuaichen Li, Chong Li, Jianfeng Wu, Haibo Cui
Summary: This paper compares and analyzes the frequency stability changes of hydrogen atomic and cesium atomic clocks in stationary and moving states, tests and analyzes the frequency stability of atomic clocks at the beginning of their transition from moving state to stationary state, analyzes the influence of the three main noises of atomic clocks on frequency stability, and analyzes the difference in the predictability of atomic clocks in moving and stationary states.
Article
Optics
Chunfu Cheng, Wen Xiao, Yiwen Ou, Yuanchang Zhu, Jie He, Zuozhun Xie, Wei Liu
Summary: A sub-nanometer resolution displacement sensor was developed using space-domain active fiber cavity ring-down (FCRD) technology. By combining active FCRD with frequency-shifted interferometry technology, a high sensitivity and stability were achieved, aided by the use of low-noise Bi-EDFA and differential detection method to reduce noise.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Qiang Liu, Zhenguo Jing, Yueying Liu, Ang Li, Zhenjie Xia, Wei Peng
Summary: A novel laser frequency modulated phase-shifting white-light interferometry (PS-WLI) is proposed to absolutely demodulate the cavity length of dynamic low-finesse Fabry-Perot sensor. By combining the advantages of frequency-switched two-step phase shifting interferometry and scanning WLI, the method can achieve absolute measurement with high sampling rate, effectively demodulating vibration signals between 0.5 to 20 kHz.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Sheng Feng, Songqing You, Peng Yang, Fenglei Zhang, Yunlong Sun, Boya Xie
Summary: We investigate optical cavity locking for laser stabilization using spatial modulation of the phase front of a light beam. A theoretical description is developed, demonstrating the creation of an error signal similar to the Pound-Drever-Hall technique for cavity locking with this method. Experimental imperfections can cause residual amplitude modulation (RAM), and strategies to suppress RAM noise are discussed. Although there are technical challenges to overcome before practical implementation, this method has great potential for compact laser stabilization systems, particularly in space-based research missions such as gravitational wave detection and inter-spacecraft laser ranging.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Optics
Chunhui Wang, Weixiong Zhao, Bo Fang, Nana Yang, Feihu Cheng, Xiao Hu, Yang Chen, Weijun Zhang, Christa Fittschen, Weidong Chen
Summary: This paper reports the development of a portable cavity ring-down spectrometer for direct and absolute measurement of HO2 radical concentration. The use of a narrow linewidth fiber laser instead of a laser diode improves the sensitivity and reduces noise interference.
Article
Optics
Marcin Witkowski, Slawomir Bilicki, Marcin Bober, Domagoj Kovacic, Vijay Singh, Ara Tonoyan, Michal Zawada
Summary: We present measurements of the photoionization cross sections of the excited P-1(1) and S-3(1) states of ultracold Sr-88 atoms at a wavelength of 389.889 nm. The photoionization cross section of the P-1(1) state is determined from ionization rates, while the photoionization cross section of the S-3(1) state is inferred from the reduction in the number of atoms transferred through this state in an optical lattice clock. The limitations of using a blue-detuned magic wavelength optical lattice in strontium optical lattice clocks are also evaluated.
Article
Chemistry, Physical
Aleksandr A. Balashov, Katarzyna Bielska, Gang Li, Aleksandra A. Kyuberis, Szymon Wojtewicz, Jolanta Domyslawska, Roman Ciurylo, Nikolay F. Zobov, Daniel Lisak, Jonathan Tennyson, Oleg L. Polyansky
Summary: The intensities of 14 lines in the sixth overtone (7-0) band of 12CO are measured using a frequency-stabilized cavity ring-down spectrometer in the visible range. This is the first observation of such a high and weak overtone spectrum of the CO molecule. A theoretical model is constructed and tested based on accurate ab initio dipole moment and semi-empirical potential energy curves. Although the high overtone transitions present a challenge due to their weak lines, agreement between theory and experiment is achieved within a few percent of experimental uncertainty, after addressing issues with the stability of the Davidson correction to the multi-reference configuration interaction calculations.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Multidisciplinary
Piotr Morzynski, Slawomir Bilicki, Marcin Bober, Adam Ledzinski, Marcin Witkowski, Mehrdad Zarei, Michal Zawada
Summary: We offer an open-source hardware and software ecosystem for optical atomic clocks, providing PCB schematics, fabrication files, and required software. These boards are designed for a bad-cavity superradiant strontium clock and an optical lattice strontium clock, but can be easily adapted for other atomic species' optical atomic clocks or ultra-cold atoms' systems like magneto-optical traps or Bose-Einstein condensate setups.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
H. Abe, M. Amano, K. Hashiguchi, D. Lisak, S. Honda, T. Miyake
Summary: We improved the spectral resolution of a miniaturized trace-moisture sensor by using cavity ring-down spectroscopy (mini-CRDS sensor) and achieving high resolution through cavity-length modulation. This technique allowed real-time measurement of trace moisture, even at low levels, and was evaluated against a metrologically traceable standard. The measurement accuracy was significantly improved using Peltier devices and the systematic error was reduced using a Voigt profile instead of a Lorentzian profile.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Physics, Multidisciplinary
Marco Lamperti, Lucile Rutkowski, Daniele Ronchetti, Davide Gatti, Riccardo Gotti, Giulio Cerullo, Franck Thibault, Hubert Jozwiak, Szymon Wojtewicz, Piotr Maslowski, Piotr Wcislo, Dario Polli, Marco Marangoni
Summary: By introducing stimulated Raman scattering metrology, a frequency comb is used to calibrate the frequency detuning between the pump and Stokes excitation lasers, overcoming the weak cross-sections of infrared-inactive transitions. The authors applied this method to investigate molecular hydrogen and achieved an unprecedented parts-per-billion accuracy in measuring the transition frequency of its Q(1) fundamental line. This comb-calibrated stimulated Raman scattering spectrometer extends the range of optical frequency metrology and can be easily adapted to measure other infrared-inactive transitions.
COMMUNICATIONS PHYSICS
(2023)
Article
Optics
Koji Hashiguchi, Minami Amano, Agata Cygan, Daniel Lisak, Roman Ciurylo, Hisashi Abe
Summary: In this study, the absorption spectra of trace water vapor in N2 gas were obtained using wavelength-meter-controlled cavity ring-down spectroscopy. The spectra were analyzed using a multispectrum fitting technique.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Article
Spectroscopy
Katarzyna Bielska, Duc Dung Tran, Aleksandr A. Balashov, Jolanta Domyslawska, Szymon Wojtewicz, Marcin Bober, Slawomir Bilicki, Roman Ciurylo, Daniel Lisak
Summary: The air-broadened lines from the oxygen B band were measured for the first time using frequency-stabilized cavity ring-down spectroscopy, and the spectra were analyzed with an advanced line-shape model. The study found temperature dependence in collisional broadening and shift, but no significant temperature dependence in speed-dependent parameters and Dicke narrowing. Additionally, it was shown that reasonable estimation of temperature dependence for pressure broadening is possible even from measurements done in single temperature.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Optics
Jianbao Zhao, Brant E. Billinghurst, Paul L. Raston
Summary: The far-infrared spectrum of room temperature formic acid labeled with 13C has been recorded and analyzed, leading to the determination of accurate line positions and predictions relevant to Earth's atmosphere and interstellar sources.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Semen Vasilchenko, Alexander Solodov, Oleg Egorov, Vladimir Tyuterev
Summary: Ozone plays a crucial role in atmospheric chemistry and radiative processes, and it may serve as a potential biosignature species in exoplanetary observations. This study utilized a continuous-wave cavity-ring-down spectrometer to accurately measure the absorption cross-sections of ozone in the near-infrared range. The results provide more precise data and have potential applications in atmospheric research.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Baorui Huang, Bo Peng, Qifeng Ren, Sheng Liao
Summary: This study utilizes the polarization bidirectional reflectance distribution function (p-BRDF) model derived from the microfacet theory to analyze the spectral p-BRDF of a brass surface. The results show that factors such as polarization state, wavelength, surface roughness, and permittivity have a significant impact on the distribution of BRDF on the object surface.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Qingwei Duan, Jiajie Wang, Qiwei Li, Xiang'e Han, Kuan Fang Ren
Summary: This paper introduces the applications of the generalized Lorenz-Mie theory (GLMT) and the vectorial complex ray model (VCRM) in the interaction between beams and particles. By comparing the experimental results, it is found that VCRM performs well in Gaussian beam scattering problems, providing a new method for studying the scattering of shaped beams by large particles/objects of any shape.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Yuefan Du, Xiaoping Li, Lei Shi, Fangyan Li, Shurong Yuan
Summary: This study proposes a physics-constrained model that utilizes the distribution characteristics of gas spectral parameters to predict spectral parameters for unknown wavelengths. Experimental results show that the model improves prediction accuracy and increases the data volume of gas spectral parameters by 4-5 times.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Laurentius Windholz, Imran Siddiqui, Shamim Khan, Syed Tanweer Iqbal
Summary: In this study, we report the discovery of two energy levels of the Pr atom that exhibit strong J-mixing, as well as the observed hyperfine structure patterns. The composition of wave functions, in addition to J-values, plays a crucial role in determining the appearance of these patterns.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Matthias Germann, Adrian Hjalten, Jonathan Tennyson, Sergei N. Yurchenko, Iouli E. Gordon, Christian Pett, Isak Silander, Karol Krzempek, Arkadiusz Hudzikowski, Aleksander Gluszek, Grzegorz Sobon, Aleksandra Foltynowicz
Summary: In this study, optical frequency comb Fourier transform spectroscopy was used to record the spectroscopic data of formaldehyde in a specific frequency range. The line positions and intensities of rovibrational transitions were obtained through line-by-line fitting. By incorporating these accurate line positions into the analysis, more energy levels and rovibrational transitions were predicted with reduced uncertainties in the H2CO spectrum.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Leonardo A. Ambrosio, Jhonas O. de Sarro, Gerard Gouesbet
Summary: This study derives a polychromatic version of the generalized Lorenz-Mie theory stricto sensu (GLMT) by expanding arbitrary time-dependent fields into partial waves using Bromwich scalar potentials. The new formalism introduces field shape spectra (FSSs) which are intrinsically frequency-dependent, modifying and redefining the physical quantities expressed in the monochromatic GLMT.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Patrick C. Chaumet
Summary: The paper proposes two new methods (IDR(s) and GPBiCGstab(L)) for computing the electromagnetic diffraction of objects larger than the wavelength. It is found that IDR(s) can reduce computation time but may not converge in some cases, while GPBiCGstab(L) always converges and also reduces computation time compared to QMR, GPBiCG, and BiCGstab.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Antigoni Kleanthous, Anthony J. Baran, Timo Betcke, David P. Hewett, Christopher D. Westbrook
Summary: To improve weather and climate models, it is important to accurately calculate the single-scattering properties of randomly oriented complex atmospheric ice crystals. This study applies Boundary Element Method (BEM) to calculate these properties in the microwave and sub-millimeter region of the electromagnetic spectrum for all-sky data assimilation. The results show that BEM can accurately compute the scattering properties of complex ice aggregates, which is crucial for weather and climate models.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Ben Niu, Yanting Li, Gang Xiong, Jihui Chen, Zhimin Hu, Yunqing Fu, Yaming Zou, Chongyang Chen, Ke Yao
Summary: This study presents both experimental and theoretical analysis of the 4d 2D5/2 -> 2D3/2 magnetic dipole transition in Rb-like ions. The correlation between the theoretical and experimental findings is observed, and it is illustrated that the contribution of the core-valence correlation is pivotal for the fine structure splittings.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
James A. Lock, Gunther P. Konnen, Philip Laven
Summary: Researchers have derived an analytical generalization of Airy theory that provides a more accurate approximation for the primary rainbow, but still has limitations for the second-order rainbow and beyond.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Shixiong Wu, Xuebang Gao, Xuqiang Dou, Li Xie
Summary: In this paper, an indoor experimental study was conducted to investigate the optical attenuation caused by sand/dust storms at different relative humidity levels. It was found that the hygroscopic growth of sand/dust particles has a significant effect on optical attenuation when the relative humidity is above 60%. Based on the double-parameter Kasten model, a proposed optical attenuation model takes into account visibility, particle size, relative humidity, and optical wavelength. Numerical calculations considering the hygroscopicity effect were also performed, and the results were in agreement with the experimental data.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Zhimin Yang, Jaeman Song, Bong Jae Lee
Summary: In this study, we analyze TPX cells operating in the self-sustaining circuit and examine the effects of different bandgaps on their performance. The results show that the bandgap energy of the LED must exceed that of the PV cell for the TPX cell to function in a self-sustaining parallel circuit. Additionally, a narrower bandgap energy for the PV cell and a wider bandgap energy for the LED can improve the performance of the TPX cell in the self-sustaining circuit.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
