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Spectral Characteristics of the Injection Quantum‐Amplifier
Author(s) -
Oraevskii I. N.,
Popov Yu. M.,
Strakhovskii G. M.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690320107
Subject(s) - amplifier , diode , signal (programming language) , materials science , optics , optoelectronics , current (fluid) , physics , cmos , computer science , thermodynamics , programming language
Experimental investigations and a theoretical analysis were made of the spectral characteristics of an injection quantum‐amplifier based on GaAs diodes. The feedback in a Fabry‐Perot cavity was attenuated by using an antireflective coating. For a sample whose characteristics were investigated in detail the threshold current after the coating was 7.8 times higher. That permitted to amplify a signal by a factor 10 3 without noticeable regeneration. For sufficiently small input signals the gain dependences on frequency and pumping current were measured when the amplifier operated in a linear regime. The results are discussed in terms of energy states (“tails”) formed near the conduction band by the impurities. Possible reasons of the discrepancy between the theoretical and experimental results at high frequencies and high currents are discussed.