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arXiv · 2202.07762

Design of a Littrow-type diode laser with independent control of cavity length and grating rotation

Lucia Duca·Elia Perego·Federico Berto·Carlo Sias
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Abstract

We present a novel extended-cavity diode laser (ECDL) based on a modified Littrow configuration. The coarse wavelength adjustment via the rotation of a diffraction grating is decoupled from the fine tuning of the external cavity modes by positioning a piezo transducer behind the diode laser, making the laser robust against misalignment and hysteresis even with long external cavities. Two laser prototypes with external cavities of different lengths were tested with a 780 nm laser diode, and locked to an atomic reference. We observe a mode-hop-free frequency tunability broader than the free spectral range of the external cavity upon changes of its length. The design is well suited to atomic and molecular experiments demanding a high level of stability over time.

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Lucia Duca, Elia Perego, Federico Berto, Carlo Sias. 2022-02-10. Design of a Littrow-type diode laser with independent control of cavity length and grating rotation. https://doi.org/10.1364/ol.423813

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