NIR reflectance spectra of the Fe-rich olivine before and after laser irradiation in this study. The left column presents the NIR spectra of four types of Fe-rich olivine, and the right column presents the spectra but normalized at 1500 nm for comparison. Images (a) and (e) Fa₂₉; (b) and (f) Fa₅₀; (c) and (g) Fa₇₁; and (d) and (h) Fa₁₀₀. In each subfigure, the black solid line represents the spectra of the initial olivine; colored solid lines represent irradiated olivine simulating Phobos conditions, P5mJ (teal), P25mJ (red), and P75mJ (brown); colored dashed lines represent irradiated olivine simulating lunar conditions, M75mJ (blue) and M150mJ (purple). In general, most irradiated olivine samples demonstrate a decrease in reflectance (i.e., darkening) compared to the initial olivine and an increase in the R₂₄₀₀/R₁₉₀₀ spectral slope (i.e., reddening). Exceptions occur in Fa₅₀ and Fa₁₀₀ under M75mJ and M150mJ conditions. Fa₅₀ shows no further reddening under the M150mJ condition compared to that under the M75mJ condition. Fa₁₀₀ shows an inversed pattern, with an increase in reflectance (i.e., brightening) and a lower extent of reddening under M75mJ and M150mJ conditions compared to those under P5mJ to P75mJ conditions. Attenuation of absorption occurred in all the irradiated samples.