论文标题
来自新近二氧化氢锂微孔子的电气可调的单频激光
Electro-optically tunable single-frequency lasing from neodymium-doped lithium niobate microresonators
论文作者
论文摘要
可调光源是许多应用程序的关键促进技术，例如范围，光谱，光学相干断层扫描，数字成像和干涉法。对于微型激光器设备，耳语画廊谐振器激光器是一个非常合适的平台，提供低阈值和小线宽，但是，许多实现都缺乏可靠的调整。稀土离子掺杂的烯橙锂提供了一种解决此问题的方法。在这里，我们提出了一种基于尼多山掺杂的硝酸锂低语画廊模式谐振器的单频激光器，该谐振器通过线性电磁效应调节。使用特殊的几何形状，我们抑制高阶横向模式，因此确保单模操作。凭借仅$ 68 \，$ V的施加电压，我们的调整范围为$ 3.5 \，$ GHz。激光频率也可以通过三角控制信号调节。自由运行的系统提供的频率和功率稳定性分别超过$Δν= 20 \，$ MHz和6％的频率和功率稳定性在30分钟内。该概念适合与基于氯锂锂的现有光子平台的完全集成。
Tunable light sources are a key enabling technology for many applications such as ranging, spectroscopy, optical coherence tomography, digital imaging and interferometry. For miniaturized laser devices, whispering gallery resonator lasers are a well-suited platform, offering low thresholds and small linewidths, however, many realizations suffer from the lack of reliable tuning. Rare-earth ion-doped lithium niobate offers a way to solve this issue. Here we present a single-frequency laser based on a neodymium-doped lithium niobate whispering gallery mode resonator that is tuned via the linear electro-optic effect. Using a special geometry, we suppress higher-order transverse modes and hence ensure single-mode operation. With an applied voltage of just $68\,$V, we achieve a tuning range of $3.5\,$GHz. The lasing frequency can also be modulated with a triangular control signal. The freely running system provides a frequency and power stability of better than $Δν=20\,$MHz and 6%, respectively, for a 30 minute period. This concept is suitable for full integration with existing photonic platforms based on lithium niobate.
