Abstract
A number of definitions of entropy in optics have both advantages and disadvantages. The major features of different entropy definitions are briefly characterized. The principal distinction between the statictics entropy definition and the thermodynamics one is indicated. The diffraction-caused radiation entropy is calculated.
Highlights
A number of problems in quantum and statistical optics requires the concept of radiation entropy, but at the moment there are a lot of different entropy definitions
Besides fundamental importance of Planck’s radiation entropy for the solution of blackbody radiation problem, that has led to occurrence of quantum physics, it is possible to note only some particular results: The general thermodynamic restrictions on efficiencies of the Stokes and anti-Stokes luminescence have been established [3]; the general conditions on radiation temperature rising in passive optical systems have been received, that, in particular, has allowed interpreting the features of nature of astrophysical masers. [4,5]
The main feature of all entropy definitions, which were considered in this short paper, is that it is impossible to state that any of them adequately satisfy the condition of thermodynamic irreversibility
Summary
A number of problems in quantum and statistical optics requires the concept of radiation entropy, but at the moment there are a lot of different entropy definitions. 1) Planck’s entropy of radiation [2] is based on the concept of radiation brightness B and on the distribution function of a system of noninteracting bosons: SPL= Besides fundamental importance of Planck’s radiation entropy for the solution of blackbody radiation problem, that has led to occurrence of quantum physics, it is possible to note only some particular results: The general thermodynamic restrictions on efficiencies of the Stokes and anti-Stokes luminescence have been established [3]; the general conditions on radiation temperature rising in passive optical systems have been received, that, in particular, has allowed interpreting the features of nature of astrophysical masers.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
