Theoretical analysis of the longitudinal mode static properties in semiconductor lasers

What is it about?

Semiconductor lasers have an optical resonator structure and output laser light of multiple wavelengths in which the light is a standing wave within the resonator. These wavelengths of light are called longitudinal modes. Typical phenomena that appear in the static characteristics of longitudinal modes were recognized as not being fully understood even in the early 1990s, and this situation continued for a long time. We have clarified for the first time the relationship between the main causes of those phenomena and the structural parameters of semiconductor lasers, which greatly influence them. The analysis covered various types of semiconductor lasers made of GaAs and InGaAsP as materials and wide-stripe and narrow-stripe as structures.

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Photo by Artem Bryzgalov on Unsplash

Photo by Artem Bryzgalov on Unsplash

Why is it important?

Is it necessary to create a new physical model to elucidate the static characteristics of longitudinal modes? The author proposed a new analysis method for longitudinal mode characteristics from the standpoint that the physical model established around 1980 was sufficiently accurate and that there was a problem with its analysis method. Semiconductor lasers have been designed and created with a focus on transverse mode characteristics, but this analysis method opens the way for designing longitudinal mode characteristics as well.