Role of Petermann's K -factor in semiconductor laser oscillators—a further note
- 23 April 1987
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 23 (9) , 450-451
- https://doi.org/10.1049/el:19870324
Abstract
The classical Schawlow–Townes formula for the linewidth of a laser should be multiplied by a factor K' = (1+αA2)K/2. In this formula, αA, is the ratio of changes in the real and imaginary parts of the compl resonant frequency resulting from a change in carrier density, and K is Petermann's factor. It is shown here that this factor is identical to a result reported in 1971 by other authors in connection with impact oscillators.Keywords
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