Abstract
An investigation was made of the threshold characteristics of a laser pumped transversely by an electron beam accelerated by voltages below 25 kV. The target was a three-layer heterostructure with a thin active region between two wide-gap layers. The lowest threshold energy of the electron beam was 10 keV at T≈90 °K (the corresponding threshold value of the current density was jth = 0.45 A/cm2) and 12 keV at T≈300 °K (jth≈0.9A/cm2).
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