IR to visible light
A natural sulfide mineral that up-converts geothermal infrared radiation into photosynthetically usable visible light via nonlinear frequency doubling.
Li, Yan · Jiaqi, Zhu · Qi-Qi, Li · Hong, Hao · Li, Tao · Jia, Haoning · Hou, Bingxu · Li, Yanzhang · Xie, Jin · Wang, Fuchen · Ye, Huan · Liu, Kaihui · Lu, Anhuai · Zhao, Jin Dong
National Science Review 2025
400–700 nm photon flux three orders of magnitude greater than blackbody emission
Second harmonic generation further amplified under high pressure
Similar up-conversion observed in other sulfide minerals, emitting wavelengths covering the entire visible spectrum