We present our state-of-the-art version of a frequency comb for calibration of astronomical spectrographs. The mode spacing of the frequency comb can be designed to match the resolution of a spectrograph. Combined wit...We present our state-of-the-art version of a frequency comb for calibration of astronomical spectrographs. The mode spacing of the frequency comb can be designed to match the resolution of a spectrograph. Combined with its excellent accuracy and stability, the spectral coverage of more than 70% of the whole visible spectrum range makes the frequency comb an ideal calibration source. In addition, the new version introduces the automatic start-up function that brings convenience to the astronomers.展开更多
Integrated photonic spectrographs could provide a new generation of low-cost,highly integrated,high-performance optical terminal instruments for astronomical observations.However,these spectrographs still face the cha...Integrated photonic spectrographs could provide a new generation of low-cost,highly integrated,high-performance optical terminal instruments for astronomical observations.However,these spectrographs still face the challenge of high spectral resolution.In this Letter,we demonstrate a cascaded phase-modulated waveguide array(CPMWA)spectrograph,with designed and measured spectral resolutions of 100,000 and 68,000,respectively.A spectral reconstruction method is proposed to minimize the influence of the phase error induced during the chip fabrication process and increase the spectral contrast to 20 dB.This type of spectrograph demonstrates promising potential for high-resolution spectrum observations in astronomy.展开更多
文摘We present our state-of-the-art version of a frequency comb for calibration of astronomical spectrographs. The mode spacing of the frequency comb can be designed to match the resolution of a spectrograph. Combined with its excellent accuracy and stability, the spectral coverage of more than 70% of the whole visible spectrum range makes the frequency comb an ideal calibration source. In addition, the new version introduces the automatic start-up function that brings convenience to the astronomers.
基金supported by the National Natural Science Foundation of China(Nos.11973009,11933005,U23A20381,11904232,11774235,and 61705130)the Jiangsu Provincial Key Research and Development Program(No.BE2023080)+3 种基金the Chinese Academy of Sciences(No.KGFZD-145-23-04-03)the National Key Research and Development Program of China(No.2022YFE0107400)the Science and Technology Commission of Shanghai Municipality(Nos.23010503600 and 23530730500)the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning(No.GZ2020015).
文摘Integrated photonic spectrographs could provide a new generation of low-cost,highly integrated,high-performance optical terminal instruments for astronomical observations.However,these spectrographs still face the challenge of high spectral resolution.In this Letter,we demonstrate a cascaded phase-modulated waveguide array(CPMWA)spectrograph,with designed and measured spectral resolutions of 100,000 and 68,000,respectively.A spectral reconstruction method is proposed to minimize the influence of the phase error induced during the chip fabrication process and increase the spectral contrast to 20 dB.This type of spectrograph demonstrates promising potential for high-resolution spectrum observations in astronomy.
