Threshold current densities and wavelengths of gain maximum and longit
udinal modes have been determined as a function of temperature for var
ious laser structures. The onset of intrapulse heating has been studie
d and interpreted. In Zn0.92Mg0.08S0.12Se0.88/ZnS0.06Se0.94/Zn0.8Cd0.2
Se lasers, thermal resistances have been measured, using substrate-up
and substrate-down mounting. From these, continuous-wave lasing regime
s have been determined.