A5022528467- Spectroscopy and Laser Applications
- Advanced Fiber Laser Technologies
- Analytical Chemistry and Sensors
- Atmospheric Ozone and Climate
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Spectroscopy and Chemometric Analyses
- Photonic and Optical Devices
- Atmospheric and Environmental Gas Dynamics
- Scientific Measurement and Uncertainty Evaluation
- Advanced Chemical Sensor Technologies
- Laser Design and Applications
- Atmospheric chemistry and aerosols
- Plasma Diagnostics and Applications
- Advanced Semiconductor Detectors and Materials
- Cancer Treatment and Pharmacology
- Gas Sensing Nanomaterials and Sensors
- GaN-based semiconductor devices and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
- Spectroscopy Techniques in Biomedical and Chemical Research
University of Science and Technology of China
2017-2024
V.E. Zuev Institute of Atmospheric Optics
2021
Hefei National Center for Physical Sciences at Nanoscale
2017-2021
National Institute of Metrology
2017
We proposed and demonstrated a method for observing the structure of phosphor-converted white light-emitting diodes (pcW-LEDs) while operating. By incorporating infrared (IR) filters placed in front camera, unclear phenomena pcW-LEDs image have been improved significantly compared to that without using IR filters. The NIR is good selection observation device during its working process glare effect. In addition, thermal camera was utilized capture temperature behavior LEDs type phosphor...
We present a new method of comb-locked cavity ring-down spectroscopy for the Lamb-dip measurement molecular ro-vibrational transitions. By locking both probe laser frequency and temperature-stabilized high-finesse to an optical comb, we realize saturation molecules with kilohertz accuracy. The technique is demonstrated by recording R(9) line in υ = 3 − 0 overtone band CO near 1567 nm. spectrum such weak (transition rate 0.0075 s−1) obtained using input power only mW, position determined be...
Precision measurement of ro-vibrational transitions in the electronic ground state hydrogen molecule can be used to test quantum electrodynamics and also determine dimensionless proton-to-electron mass ratio. Saturation spectroscopy 2-0 overtone deuterium (HD) were measured with three cavity-enhanced methods. With a sensitivity at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mn>10</mml:mn> <mml:mo>−</mml:mo>...
Selective pumping and probing of highly excited states molecules are essential in various studies but also challenging because high density states, weak transition moments, lack precise spectroscopy data. We develop a comb-locked cavity-assisted double-resonance (COCA-DR) method for precision measurements using low-power continuous-wave lasers. A high-finesse cavity locked with an optical frequency comb is used to enhance both the power sensitivity. As demonstration, Doppler-free stepwise...
Narrow optical resonances of atoms or molecules have immense significance in various precision measurements, such as testing fundamental physics and the generation primary frequency standards. In these studies, accurate transition centers derived from fitting measured spectra are demanded, which critically rely on knowledge spectral line profiles. Here, we propose a new mechanism Fano-like resonance induced by distant discrete levels experimentally verify it with Doppler-free spectroscopy...
The (30012) ← (00001) band of 12C16O2 in the 1.6 μm region is used for satellite observation carbon dioxide Earth's atmosphere. Here, we report a Doppler-free spectroscopy study this with comb-locked wavelength-modulated cavity-enhanced absorption spectroscopy. Frequencies 18 transitions rotational quantum numbers up to 42 were determined sub-kHz accuracy, corresponding fractional uncertainty at 10-12 level. With precision, revealed an anomalous decrease line shift and increase broadening...
Compact, low-noise microwave oscillators are required throughout a wide range of applications such as radar systems, wireless networks, and frequency metrology. Optical division via an optical comb provides powerful tool for signal generation. Here, we experimentally demonstrate reference down to 26 GHz based on the dissipative Kerr soliton comb, which is generated CMOS-compatible, high-index doped silica glass platform. The through two continuous wave lasers locked ultralow expansion...
Noise-immune cavity enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is extremely sensitive in detecting weak absorption. However, the use of NICE-OHMS for metrology study was also hindered by its sensitivity to influence from various experimental conditions such as residual amplitude modulation. Here we demonstrate precision measurements Lamb-dip spectra molecules. After a dedicated investigation systematic uncertainties measurement, transition frequency ro-vibrational line...
Saturation spectroscopy is frequently used to obtain sub-Doppler measurement of atomic and molecular transitions. Optical resonant cavities can be enhance the effective absorption path length, laser power inside cavity as well saturate very weak ro-vibrational transitions molecules. Three different cavity-enhanced methods, enhanced spectroscopy, ring-down noise-immune optical heterodyne (NICE-OHMS), were compared by measuring Lamb dip a C2H2 line at 1.4 µm using with finesse 120000. The...
Abstract Sub-Doppler saturated absorption spectroscopy of rovibrational transitions carbon monoxide broadened by nitrogen was recorded at low pressures (1-24 Pa) near 1.56 µ m with comb-locked cavity ring-down saturation spectroscopy. We found a nonlinear pressure dependence the Lamb-dip width CO transition induced elastic scattering. Analysis results allows us to characterize parameters elastic- and nonelastic- scattering under collisions. The angle for nitrogen-induced collisions (CO-N 2 )...
Interactions between a molecule and two or more laser fields are of great interest in various studies, but weak highly overlapping transitions hinder precision measurements. We present the method comb-locked cavity-assisted double resonance spectroscopy based on narrow-linewidth continuous-wave lasers, which allows for state-selective pumping probing molecules. By locking near-infrared diode lasers to one cavity with finesse at order 105, we measured all three types resonances. Carbon...
Temperature dependence of molecular absorption line shape is important information for spectroscopic studies and applications. In this work, we report a comb-locked cavity ring-down spectrometer employing cryogenic cooler to perform spectroscopy measurements at temperatures between 40 K 300 K. As demonstration, recorded the spectrum R(0) in (2-0) band HD 46 The temperature was also confirmed by Doppler width line. Spectra CH4 near 1.394 μm were wide range 70-300 Lower-state energies methane...
For the applications of frequency comb in microresonators, it is essential to obtain a fully frequency-stabilized microcomb laser source. Here, we demonstrate an atom-referenced stabilized soliton generation system based on integrated microring resonator. The pump light around $1560.48\,\mathrm{nm}$ locked ultra-low-expansion (ULE) cavity, frequency-doubled and referenced atomic transition $^{87}\mathrm{Rb}$. repetition rate injection-locked atomic-clock-stabilized radio (RF) source, leading...
Accurate parameters of the N 2 O transitions in 1.5µm region are needed for monitoring global concentration atmosphere.The strongest band this is 0003-0000 band.In HITRAN database, some given by calculation, others experiments but they obtained Voigt profile, which now well known can lead to significant deviations.The ro-vibrational with line intensities order 10 -24 -23 cm -1 /(molecule•cm -2 ) have been recorded using a laser-locked cavity ring-down spectrometer high sensitivity as...