We present a hybrid-integrated extended cavity diode laser tunable around 637 mn, with a total tuning range of 8 nm, allowing to address the zero-phonon line of nitrogen vacancy centers. The laser provides wide mode-hop free tuning over 43.6 GHz and a narrow intrinsic linewidth below 10 kHz. The maximum output power is 2.5 mW in a single-mode fiber, corresponding to an on-chip power of 4.0 mW. The laser is assembled in a standard laser housing and fiber-pigtailed.
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