Duca Lucia, Perego Elia, Berto Federico, Sias Carlo
Opt Lett. 2021 Jun 15;46(12):2840-2843. doi: 10.1364/OL.423813.
We present a novel, to the best of our knowledge, extended-cavity diode laser 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 observed a mode-hop-free frequency tunability broader than the free spectral range of the external cavity upon changes in its length. The design is well suited to atomic and molecular experiments demanding a high level of stability over time.
据我们所知，我们提出了一种基于改进型利特罗结构的新型外腔二极管激光器。通过旋转衍射光栅进行的粗波长调节与通过将压电换能器放置在二极管激光器后面来对外部腔模进行的微调解耦，使得即使对于长外腔，该激光器也能抗失调和滞后。使用780 nm激光二极管对两个具有不同长度外腔的激光原型进行了测试，并锁定到原子参考。我们观察到，随着外腔长度的变化，无模式跳变的频率可调谐范围比外腔的自由光谱范围更宽。该设计非常适合对时间稳定性要求较高的原子和分子实验。
