Jacques Arnaud, M. B. El Mashade

IEEE Journal of Quantum Electronics, vol QE-22, n°4, avril 1986

ABSTRACT

Petermann has proposed that the classical formula for the linewidth of a laser be multiplied by a factor K ≥≥ 1 in the case of gain-guided semiconductor lasers (1). The concept of power in the mode used by that author, however, is not well defined in a waveguide with gain, and his theory is therefore opened to question. The analysis given here avoids this difficulty ans nevertheless agrees with Petermann’s result. This is because spatial mode filtering is strong in oscillating lasers.

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