We have found that the output spectra of cleaved GaAs lasers are broadened when they are optically pumped with a high-energy pulsed laser. We believe the effect is due to transient heating. A one-dimensional heat-flow equation is solved and the results predict the observed broadening. Ways of improving the mode spectra by reducing the broadening are discussed.
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Figueroa et al. (1977) studied this question.
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