Abstract
Under certain operating conditions, the maximum output power from an external cavity diode laser is obtained for non-axial alignments of the external plane mirror. This is explained in terms of a spatially dependent coupling coefficient. It is found that there are different systematic sequences between the spectral content of the output and the axial alignment of the external reflector for two different laser diodes that have been used. These results give new insight into choosing the most appropriate diodes for obtaining robust single frequency operation of external cavity diode lasers, and have significant implications for reassessing the standard methodology for optimising these systems.
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