Abstract
Long-external-cavity structure is the main means to obtain the narrow linewidth semiconductor laser output necessary for such applications as coherent optical communications. The conventional external cavity lasers comprise three mirrors: the two facets of a laser diode and an external reflector, a two-segment cavity structure.1,2 However, for this structure, the single-mode suppression ratio is not very high, and it is liable to incur an oscillation of the long-cavity longitudinal-mode cluster.3 These defects can be overcome by using more mirrors or F.-P. etalons instead of a single reflector forming a multisegment cavity system.
© 1986 Optical Society of America
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