The properties of cooled Alx Ga1−x As heterojunction laser diodes operating at wavelengths below 7000 Å are described. At 77 K, the shortest wavelength at which pulsed laser operation is obtained is 6280 Å, while convenient cw operation has been obtained to 6570 Å. Pulsed laser diode operation to 6770 Å was obtained up to 223 K.
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Kressel et al. (1973) studied this question.
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