We have constructed and characterized an affordable medium-finesse optical cavity \(({\mathcal {F}}\sim {1500})\) for the stabilization of tunable diode lasers at two different wavelengths (780, and \({960\,\textrm{nm}}\), respectively). Its main element is an ultra-low expansion glass spacer, whose temperature was stabilized using thermoelectric cooler elements inside a vacuum chamber. By combining the dual sideband technique and the classical Pound–Drever–Hall technique, we were able to lock the lasers at any frequency within the cavity free spectral range. The cavity presents a long-term drift of resonant frequency of \({1.2\,\mathrm{MHz/day}}\), which can be compensated for by temperature variation. Finally, we demonstrate the cavity use in an electromagnetically induced transparency microwave spectrum experiment in a thermal atomic sample.

我们构建并表征了一种经济实惠的中等精度光学腔\(({\mathcal {F}}\sim {1500})\)，用于稳定两个不同波长（780 和\({960\ ,\textrm{nm}}\)分别）。其主要元件是超低膨胀玻璃间隔件，其温度通过真空室内的热电冷却器元件来稳定。通过结合双边带技术和经典的庞德-德雷弗-霍尔技术，我们能够将激光器锁定在无腔光谱范围内的任何频率。腔体的谐振频率存在长期漂移\({1.2\,\mathrm{MHz/day}}\)，可以通过温度变化进行补偿。最后，我们演示了热原子样品中电磁感应透明微波光谱实验中腔体的使用。