The solar grating spectrometer is an essential tool to study the thermodynamics properties of the\nsolar atmosphere with different height distributions, but its imaging performance will be degraded\nby the wavefront aberration generalized by the atmospheric turbulence. On the other hand,\nthe narrow slit of the grating spectrometer will filter the wavefront aberration to some extent. The\ninfluence of the filter slit on the wavefront aberration and the correction requirement of the adaptive\noptics are analyzed theoretically and experimentally. We demonstrate that the influence of\nfilter slit on the different types and magnitudes of wavefront aberration is different, and the RMS\nvalue of the wavefront aberration less than 0.3 is down to below almost 60% after the filter slit,\nand it can lower the correction range requirement of the adaptive optics. The numerical simulation\nand experiment results show that: after the adaptive optics correction, the influence of the\nwavefront aberration on the spectral resolution is neglected, and the energy utilization is considerably\nimproved; both numerical simulation and experiment results are in good agreement.
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