Broad band p-Ge optical amplifier of terahertz radiation
نویسندگان
چکیده
A solid state broad band amplifier of terahertz radiation ~1.5–4 THz!, based on intersubband transitions of hot holes in p-Ge is demonstrated. The gain is investigated as a function of applied magnetic and electric fields by transmission measurements using a laser system with two p-Ge active crystals, when one operates as an oscillator and one as an amplifier. A peak gain higher than usually reported for p-Ge lasers has been achieved using time separated excitation of the oscillator and amplifier. Distinct differences in gain dependence on applied fields are noted between lowand high-frequency modes of p-Ge laser operation. © 1999 American Institute of Physics. @S0021-8979~99!04718-0#
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