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Laser optical frequency combs and their applications in optical fibre communication systems and astrophysics
摘要： This paper examines the generation and applications of laser optical frequency combs (LOFCs). The unique properties of LOFCs are widely used in spectroscopy and metrology, in particular for making ultra-accurate optical clocks. The use of LOFCs contributes to advances in optical fibre communication systems and studies pertaining to fundamental problems of astrophysics, such as the search for and investigation of exoplanets and verification of the hypothesis that physical constants vary with time.
关键词： exoplanets,optical frequency comb,calibration of astronomical spectrographs,multiplexing,Doppler spectroscopy
更新于2025-09-23 15:19:57
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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