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1 Semiconductor Lasers and VCSEL History
Kenichi Iga
1.1 History and Basics of Semiconductor Lasers
The vertical‐cavity surface‐emitting laser (VCSEL, pronounced “vic‐cell”) is a special class of semiconductor laser that emits coherent, or laser, light orthogonally to the semiconductor substrate as shown in the schematic in Figure 1.1. The VCSEL device and its applications are the core subject of this book. This VCSEL structure generates a host of industrial applications that will be introduced comprehensively throughout this book. Before starting with a history of VCSELs, let us begin with some basic concepts of semiconductor lasers to aid in the understanding of the following chapters for general readers.
Figure 1.1 Schematic of a vertical‐cavity surface‐emitting laser (VCSEL).
Source: Figure by K. Iga [copyright reserved by author].
