Abstract
Although in 1946 Purcell pointed out that the spontaneous emission rate of an excited system is not unaltered (it can be changed with changes in the environment), people regard spontaneous emission as a basic characteristic of matter according to classical radiation theory. They consider the alteration or elimination of spontaneous emission to be impossible. There has recently been much interest in the use of microcavity or dielectric structures to modify the rate or spatial pattern of spontaneous emission. It has been suggested that controlling spontaneous emission can reduce the laser threshold to very low (near-zero) levels. The relation between thermal radiation and spontaneous emission is close; it can provide information about the spontaneous emission of matter. Inhibited thermal radiation is of interest in laser theory. Thermal radiation measurement is also important in space technology, solar energy, and infrared technology. The measuring method for the emission spectrum of opaque matter has been reported by Ford and Spragg, but it has not been reported for partially transparent reflecting bodies until now. In this paper, we put forward a sample model of partially transparent reflecting bodies to analyze the sample emissivity and give a simple method for measuring the emission spectrum for partially transparent reflecting bodies.
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