Abstract
To observe fine structures on the Sun and study the thermodynamic properties of the solar atmosphere with different height distributions, a diffraction-limited imaging grating spectrometer with high spectral resolution is an essential tool. However, its imaging performance will be limited by wavefront aberration caused by atmospheric turbulence and static wavefront aberration. In order to compensate the aberrations and lower the manufacturing precision of the optical element, an aberration correction method for a diffraction-limited Littrow imaging grating spectrometer (DLIGS) based on adaptive optics is proposed. To correctly detect the static aberration, the calibration system is adopted. To validate the method, a prototype for the New Vacuum Solar Telescope is developed. The results demonstrate that the proposed method is feasible, and near diffraction-limited imaging performance is achieved after the adaptive optics correction. The real spectral resolution of the prototype is roughly 6 pm, which is close to the numerical result (5.6 pm).
© 2019 Optical Society of America
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription