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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Dynamically stabilized high vacuum inside MEMS optical cells for atomic spectroscopy
摘要： Self-pumping high-vacuum MEMS optical cell for Cs/Rb atomic spectroscopy is presented for the first time ever. The MEMS alkali vapor cell and ion sorption micropump have been integrated forming unique, probably first in the World solution allows to generate high vacuum and introduce alkali atoms on chip. The vacuum level on 10-6 Torr has been dynamically stabilized in the presence of rubidium vapors continuously introduced from solid-state dispenser. Achieved results opens a new possibility to fabricate new class of optical cells for atomic spectroscopy.
关键词： high vacuum MEMS,atomic spectroscopy,alkali cell
更新于2025-09-23 15:21:21
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Investigation of minor elemental species within tablets using in situ depth profiling via laser-induced breakdown spectroscopy hyperspectral imaging
摘要： Laser-induced breakdown spectroscopy (LIBS) hyperspectral imaging allows for the determination of two-dimensional and three-dimensional spatial distributions of elemental species throughout complex samples. In this work, LIBS hyperspectral imaging was utilized to investigate minor elemental species within tablets. Representative LIBS spectra were initially collected on four complex, heterogeneous tablets, showing high concentrations of Ti in the tablet coating, with low and variable abundance of Na, Mg, and K. Principal component analysis revealed distinct resolution of the four tablets due to differences in Na, Mg, and K. Using two-dimensional LIBS hyperspectral imaging, spatial distributions of Na, Mg, and K within defined x and y regions of the tablet coating were generated. Subsequent three-dimensional LIBS hyperspectral imaging further elucidated the full x, y, and z spatial distributions of these minor elemental species within the tablet surface, tablet coating, and tablet core. As such, in situ depth profiling of the minor elemental species within each tablet was accomplished. Quantification of the homogeneity and uniformity of each tablet was determined. To our knowledge, this is the first report of multivariate analysis, LIBS, and LIBS hyperspectral imaging being utilized for the determination of both 2D and 3D spatial distributions of minor elemental species, along with quantification of tablet homogeneity, within tablets.
关键词： Chemical imaging,Laser-induced breakdown spectroscopy,Chemometrics,Pharmaceutical analysis,Atomic spectroscopy
更新于2025-09-23 15:19:57
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Stabilizing diode laser to 1?Hz-level Allan deviation with atomic spectroscopy for Rb four-level active optical frequency standard
摘要： We achieve a compact ultra-stable 420 nm blue diode laser system by immediately stabilizing the laser on the hyperfine transition line of Rb atom. The Allan deviation of the residual error signal reaches 1 Hz-level Allan deviation within 1 s averaging time, and the fractional frequency Allan deviation is 1.4 × 10?15∕√?? , which shows the best result of frequency-stabilized lasers based on the atomic spectroscopy without Pound–Drever–Hall (PDH) system. The signal-to-noise ratio of the atomic spectroscopy is evaluated to be 3,000,000 from the Allan deviation formula, which is the highest record, to the best of our knowledge. The frequency noise suppression characterization is demonstrated and the maximal noise suppression can be near 40 dB at 6 Hz. As a good candidate of pumping source, the ultra-stable 420 nm diode laser is successfully used in our Rb four-level active optical frequency standard system. The method can be easily extended to other wavelengths ultra-stable lasers with a Allan deviation of 10?15 level retaining an atomic reference with low cost and low complexity while in the absence of an expensive and complicated PDH system.
关键词： ultra-stable laser,Rb four-level active optical frequency standard,atomic spectroscopy,Allan deviation,frequency noise suppression
更新于2025-09-19 17:13:59