Temperature characteristics of a photoinduced blackbody in intense light fields

A “whitebody” can transform into a “blackbody” under intense light exposure, and the temperature of photoinduced blackbodies deviates significantly from Planck's law. This discovery necessitates the consideration of light excitation's impact on the radiation spectrum of a blackbody when applying Planck's formula. Under the adiabatic approximation, this paper theoretically derives the relationship between the temperature of photoinduced blackbodies and the intensity of excitation light field. The actual temperature of a photoinduced blackbody is directly proportional to the fourth root of the excitation light power. Experimental data demonstrate that this relationship can more accurately describe the temperature characteristics of a photoinduced blackbody in intense light fields. These results provide a theoretical foundation for further investigation into photoinduced blackbody radiation, contribute to an enhanced comprehension of the underlying physical mechanism behind this phenomenon, and may have significant implications for celestial temperature measurements based on Planck's law.