Abstract
The mode stability of the external cavity diode laser (ECDL) is an increasingly important characteristic for applications in experiments. We derive the optimal initial external-cavity length to obtain the maximum dynamic mode stability range in the situation that the grating surface and pivot arm are not on the same plane. We also analyze the effect of the structure parameters on the ECDL continuous tuning range. In this paper, it can readily achieve a 9.37 nm mode-hop free tuning range at 780 nm using the given parameters. It is also found that decreasing the distance between the grating surface and pivot arm Lg and increasing the distance between the pivot point and the grating L0 simultaneously can not only expand the tuning range but also narrow the linewidth availably.
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