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When pulse operated, all injection lasers show a laser line shift which is linear with time during the pulse length. This is evident for time-resolved spectra obtained by a scanning technique. The data present time-resolved spectra for pulse-operated gallium arsenide laser diodes. At high peak current values, joule heating results and the time-resolved laser spectra are seen to shift to longer wavelengths. A line-shift coefficient is defined for which the units are angstroms per (ampere)2per microsecond. For high peak current and long pulse length, the laser lines may shift one hundred angstroms or more.