Kalchmair Stefan, Blanchard Romain, Mansuripur Tobias S, de Naurois Guy-Mael, Pfluegl Christian, Witinski Mark F, Diehl Laurent, Capasso Federico, Loncar Marko
Opt Express. 2015 Jun 15;23(12):15734-47. doi: 10.1364/OE.23.015734.
Predictable tuning behavior and stable laser operation are both crucial for laser spectroscopy measurements. We report a sampled grating quantum cascade laser (QCL) with high spectral tuning stability over the entire tuning range. We have determined the minimum loss margin required to suppress undesired lasing modes in order to ensure predictable tuning behavior. We have quantified power fluctuations and drift of our devices by measuring the Allan deviation. To demonstrate the feasibility of sampled grating QCLs for high-precision molecular spectroscopy, we have built a simple transmission spectroscopy setup. Our results prove that sampled grating QCLs are suitable light sources for highly sensitive spectroscopy measurements.
可预测的调谐行为和稳定的激光运行对于激光光谱测量都至关重要。我们报道了一种在整个调谐范围内具有高光谱调谐稳定性的采样光栅量子级联激光器（QCL）。我们已经确定了抑制不期望的激光模式以确保可预测调谐行为所需的最小损耗裕度。我们通过测量阿伦偏差来量化我们器件的功率波动和漂移。为了证明采样光栅QCL用于高精度分子光谱的可行性，我们构建了一个简单的透射光谱装置。我们的结果证明，采样光栅QCL是用于高灵敏度光谱测量的合适光源。
