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7 February 2007 Analysis of power harmonic content and relaxation resonant frequency of a diode laser
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We have performed an analysis of harmonic contents of the optical output power for a diode laser and described the results in details. In the first step the absolute value of power for each harmonic is obtained in terms of various diode laser parameters, and the variations of external parameters such as modulation current, bias current and frequency are discussed. The analysis is done by direct solution of rate equations of an arbitrary diode laser for carrier and photon densities. We conclude that the maximum power occurs at isolated peaks and their loci have been investigated and shown to be predictable by theory. It is known that the optical power has a nonlinear dependence on frequency, and the maximum optical power of each harmonic attained in its resonance frequency. The resonant frequency is shown to be tunable by bias current; thus in the next step we obtain the transfer function for different harmonic contents and have achieved exact expression for each, allowing better optimization to gain improved results. We extend the approach to higher harmonics and numerically calculate the THD (Total Harmonic Distortion) versus related parameters such as frequency, bias current and modulation current. Furthermore we found an effective approach to reduce SHD (Second Harmonic Distortion). The sequence for every arbitrary laser structure is also possible to be developed by the approach presented in this work.
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Hesam Zandi, Meysam Bavafa, Maysamreza Chamanzar, and Sina Khorasani "Analysis of power harmonic content and relaxation resonant frequency of a diode laser", Proc. SPIE 6468, Physics and Simulation of Optoelectronic Devices XV, 64680J (7 February 2007);

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