中国科学院南京天文光学技术研究所机构知识库

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 pro posed 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.