Abstract
It is often beneficial to operate laser diodes with optical feedback, as provided, for example, by an external mirror according to Fig. 9.1. This external mirror may serve, for example, for the selection of a distinct longitudinal mode of Fabry—Perot-type lasers in order to get a better side-mode suppression [1–6]. If the longitudinal mode selection is provided by other means, e.g. a grating reflector or by using a DFB-laser diode, the external feedback may be used for tuning the laser emission frequency [7] or for a considerable linewidth narrowing [8–18]. An external cavity may also be useful for reducing the laser chirp, as has already been discussed in Chapter 5.
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