This paper presents the study of the spectral linewidth of a vertical-cavity surface-emitting lasers in the 89X nm spectral range. The devices demonstrate single-mode lasing with a pronounced stable direction of linear polarization in a  wide temperature range and at all operating currents. The minimum recorded spectral linewidth for the devices under study was 43 MHz at room temperature. It was shown that an increase in external temperature by one hundred  degrees leads to an increase in the minimum spectral line width of the laser by more than four times. At the same time, the spectral linewidth of the vertical-cavity emitting lasers under study is less than 100 MHz at temperatures up to 80°C with an output optical power of more than 150 μW, which demonstrates the promise of using the developed vertical-cavity emitting lasers in compact atomic sensors.