Mode-hop-free tuning over 135 GHz of external cavity diode lasers without antireflection coating
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We report an external cavity diode laser (ECDL), using a diode whose front facet is not anti-reflection (AR) coated that has a mode-hop-free (MHF) tuning range greater than 135 GHz. We achieved this using a short external cavity and by simultaneously tuning the internal and external modes of the laser. We find that the precise location of the pivot point of the grating in our laser is less critical than commonly believed. The general applicability of the method, combined with the compact portable mechanical and electronic design, makes it well suited for both research and industrial applications.
KeywordsTuning Range Pivot Point External Cavity Free Spectral Range External Cavity Diode Laser
This work is partially supported by the National Science Foundation (Grant number CCF0829918). S.D. acknowledges Adeel Altaf and Dionysios Antypas for helpful discussions.