Advances in Research on Detection and Correction of Aberrations in Grating Spectrometers for Optoelectronics

【Chinese Instrument Network Instrument Development】 Recently, the Institute of Optics and Electronics of the Chinese Academy of Sciences theoretically analyzed the influence of wavefront aberration on spectral broadening and energy efficiency of grating spectrometers, and proposed a dual-wavefront sensor based adaptive optics technology. Solar grating measurement method.

Analysis of Influence of Aberration on Spectral Resolution of Grating Spectrometer

Grating spectrometer is an important tool to study the basic physical reaction process of the solar atmosphere outburst. It can be used to determine the thermodynamic parameters in the physical reaction process, such as magnetic field, temperature, pressure, and element abundance. As one of the important instruments in the back end of the solar telescope, it is an effective means for scientific research and applied research on solar activity scientific observation and space weather forecast and prediction.

Experimental Study on Influence of Kolmogorov Turbulence Phase Screen on Spectral Profile of Grating Spectrometer

However, the spectral imaging performance of the grating spectrometer based on the ground-based solar telescope is severely restricted by the dynamic wavefront aberration caused by atmospheric turbulence and the static aberration in the optical system. Its spectral resolution and energy utilization are limited, and the large-diameter foundation cannot be fully utilized. The solar telescope should have high spatial resolution, high spectral resolution, and high light collection capabilities. However, the traditional adaptive optics system is integrated in the telescope system, which can only correct the dynamic wavefront aberration of the beam before entering the grating spectrometer, and cannot achieve system-wide aberration detection and correction.

Based on the current development of the ground-based solar telescope grating spectrometer and the advantages of the Opto-electronics adaptive optics technology, the research team of the Institute of Optoelectronics theoretically analyzed the influence of wavefront aberration on spectral broadening and energy efficiency of the grating spectrometer, and proposed a method based on it. Solar grating spectroscopy measurement method using dual wavefront sensor adaptive optics technology: A Hartmann wavefront sensor is introduced through the conjugate position in the focal plane of the spectrometer, and a dual wave front sensor is used to measure the wavefront aberrations in multiple steps and two The data detected by the wavefront detectors are fused to generate a corresponding correction control signal, thereby realizing the correction of the dynamic wavefront aberration and the system static aberration in the entire optical system, and improving the spectral imaging performance of the grating spectrometer. Simulation and experimental results verify the feasibility and effectiveness of the proposed spectrometer.

(Original title: Research progress in the research on the adaptive optical detection and correction of the aberrations of the solar grating spectrometer in the photoelectric field)