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Isotope shifts in the spectrum of the neutral titanium atom
摘要： An investigation of 53 saturated absorption lines of titanium at wavelengths ranging from 695 to 1005 nm is performed. In addition, transitions 3d34s a5FJ → 3d34p y5FJ (J = 3, 4, 5) in the ultraviolet range are measured. The isotope lines of 46Ti, 48Ti, and 50Ti are clearly observed for 53 transitions. A facing target sputtering system containing a magnetic field is used as a sample cell of titanium in this experiment. The Zeeman effect in a hyperfine structure is calculated for the condition of an intermediate field approximation to determine the unperturbed line positions in the odd mass isotopes 47Ti and 49Ti. For all observed transitions, the King plot analysis is performed to determine the electronic factors of the field shift and specific mass shift.
关键词： Isotope Shift,Saturated absorption spectroscopy
更新于2025-09-19 17:15:36
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Contaminant Free End-Capped Acetylene PMC for Sub-Doppler Spectroscopy
摘要： Gas-filled Hollow Core Photonic Cristal Fibres (HCPCF) or Photonic MicroCell (PMC) has proven to offer an outstanding gas-cell for laser metrology and spectroscopy applications. Sub-Doppler spectral features, generated via electromagnetically induced transparency (EIT) or saturated absorption (SA), have been generated in molecular gases despite the weak strength of their optical transitions, and an optical frequency reference with excellent accuracy has been demonstrated. Here, we report on fabrication and spectroscopic (EIT and SA spectroscopy) characterisation of contaminant free acetylene PMC where no He or glue is required. The assembly process of this PMC is based on end-capping both ends of a HCPCF by collapsing a sleeve capillary while the system is still connected to the vacuum preventing any air pollution. The end-cap is then polished and mounted onto FC/APC connectors for easy system integration.
关键词： saturated absorption,Hollow Core Photonic Cristal Fibres,Photonic MicroCell,electromagnetically induced transparency,sub-Doppler spectroscopy
更新于2025-09-12 10:27:22
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Laser diagnostics for the electron density of helium low temperature plasmas using saturated absorption spectroscopy
摘要： Helium (He) low temperature plasma with an electron density higher than 10^11 cm^-3 was produced using an inductively coupled plasma source, and the electron density of this plasma was determined using a high-resolution laser spectroscopic technique. To remove the Doppler broadening which is the most dominant line broadening in low temperature plasmas, a saturated absorption spectroscopy system was configured. The Lamb dip was successfully separated from the Doppler broadening for the 2^1S - 4^1P transition of the He plasma using a high-resolution laser beam with a narrow spectral line width (below 1 MHz) at 396.5 nm. The estimated spectral line widths of natural broadening, van der Waals broadening, resonance broadening, and Stark broadening were 40.14 MHz, 0.93 MHz, 0.15 MHz, and 12.60 MHz, respectively, when the He gas pressure was 30 mTorr and 1 kW RF power was applied. The electron density of the He plasmas was determined to be ~3 x 10^11 cm^-3, which was comparable with those determined by a Langmuir probe and optical emission spectroscopy combined with a collisional-radiative model.
关键词： Low temperature plasma,Spectral line broadening,Saturated absorption spectroscopy,Helium
更新于2025-09-11 14:15:04