Chapter 5
Broadly Tunable External-Cavity Semiconductor Lasers
F. J. Duarte
5.1 Introduction
Tunable semiconductor lasers have become widely used in a plethora of applications, including communications, imaging, interferometry, medicine, metrology, remote sensing, and spectroscopy. The advantages of tunable semiconductor lasers include direct electrical excitation, compactness, low cost, and simplicity.
The approximate spectral coverage available from tunable semiconductor lasers is outlined in Table 5.1. The most widely used tunable external-cavity semiconductor (ECS) lasers belong to the III–V classification and employ GaAlInP, GaAlAs, and InGaAsP semiconductors. The single-device continuous-wave (CW) power levels offered by these lasers, ...
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