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Abstract
The emission lines of 140–180 nm are auroral bands of ${{\rm N}_2}$ Lyman–Birge–Hopfield, and they have been imaging targets of many satellites that need reflective mirrors. To obtain good imaging quality, the mirrors also should have excellent out-of-band reflection suppression as well as high reflectance at working wavelengths. We designed and fabricated non-periodic multilayer ${{\rm LaF}_3}/{{\rm MgF}_2}$ mirrors with working wave bands of 140–160 nm and 160–180 nm, respectively. We used a match design method and deep search method to design the multilayer. Our work has been utilized in the new wide-field auroral imager of China, and the application of these notch mirrors with excellent out-of-band suppression reduces the utilization of corresponding transmissive filters in the optical system of space payload. Furthermore, our work provides new routes for the design of other reflective mirrors in the far ultraviolet region.
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