Abstract
A modulation and detection scheme for applying derivative techniques to the investigation of stripe geometry (Al, Ga)As double-heterostructure lasers is described. Modulating at constant modulation index allows the quantities I(dV/dI) and I <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (d <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> V /dI <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) to be directly obtained in the same apparatus at the first and second harmonic of the modulation frequency, respectively. Particularly strong indications of laser action and other optical interactions in the laser are contained in the second harmonic voltage response. The same apparatus may be used to obtain derivatives of the light-current relation. These are found to sensitively reveal light-current nonlinearities that are believed caused by filaments and other spatial inhomogeneities and instabilities.
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