The effect of the cavity length on the output optical power of semiconductor laser-thyristors based on AlGaAs/GaAs/InGaAs heterostructures

The effect of laser-thyristor cavity length on the characteristics of the generated laser pulses has been studied. Results show that for pulse durations of approximately $\sim$20–30 ns, achieved with a nominal discharge capacitor of 22 nF, increasing the cavity length from 480 to 980 $\mu$m enables a rise in maximum peak power from 16.6 W to 25.4 W. A further extension of the cavity length to 1950 $\mu$m causes an insignificant decrease in the maximum peak power to 23.7 W due to lower external differential efficiency of the samples at the initial linear region of the light-current curve. However, this extension provides a reduction of optical pulse duration compared to samples of other lengths over the entire supply voltage range.