Application of the concept of the thermal time "constant" for a description of the transient thermal behavior of diode lasers is examined in the present paper. This concept rests on the assumption that the lumped-heat-capacity method is applicable in this case what turns out not to be true. The thermal time "constant" appears to change nearly linearly with time, therefore the above approach seems to give inaccurate results.
"Is The Thermal Time "Constant" Of A Diode Laser Really Constant?", Proc. SPIE 1085, Optical Fibres and Their Applications V, (30 January 1990); doi: 10.1117/12.952970; https://doi.org/10.1117/12.952970