Temperature characteristics of a photoinduced blackbody in intense light fields.

This article focuses on the phenomenon of photoinduced blackbody radiation (PBR), where intense light irradiation transforms a whitebody material into a photoinduced blackbody exhibiting strong broadband absorption and emission that deviates from traditional blackbody behavior described by Planck's law. The study theoretically derives and experimentally validates a relationship showing that the actual temperature of a photoinduced blackbody is proportional to the fourth root of the excitation light power, contrasting with spectral color temperatures obtained via Planck’s formula, which significantly overestimate the temperature. The authors attribute these deviations to the generation of novel photoinduced blackbody radiation (PBR) energy states under intense light, which disrupt the original Boltzmann distribution of energy levels and create an "optical population" effect. These findings challenge the conventional application of Planck’s law for temperature measurement in strongly irradiated materials and have implications for fields such as industrial production and astronomy that rely on blackbody radiation for temperature determination.