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Toward Stand-Alone Alkali-Based Mid-Infrared Frequency References
ACS Photonics ( IF 6.5 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsphotonics.0c00308 Yoel Sebbag 1 , Roy Zektzer 1 , Yefim Barash 1 , Uriel Levy 1
ACS Photonics ( IF 6.5 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsphotonics.0c00308 Yoel Sebbag 1 , Roy Zektzer 1 , Yefim Barash 1 , Uriel Levy 1
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Highly accurate and precise spectroscopy in the mid-infrared (MIR) spectral region is a versatile tool that finds great interest in fundamental scientific research as well as in mitigating myriad applications in diverse fields. A major driving force for the rapidly increasing interest in MIR spectroscopy is the emergence of quantum cascade lasers (QCLs). Yet, as of today, such QCLs are still experiencing significant free-running frequency fluctuations which makes their frequency stabilization challenging. Here, we propose and experimentally demonstrate a method enabling development of frequency standards in the MIR, based on high excited stats of alkali vapors. The technique is based on the generation of a Doppler-free gain spectrum in the MIR by copropagating two stabilized pump near-infrared (NIR) lasers. Using this technique, the frequency of a distributed feedback (DFB) QCL at 5.23 μm is stabilized to the corresponding 62P3/2–52D5/2 transition of rubidium (Rb) vapors, showing a substantial stability improvement compared to the free-running operation. Stabilization to an atomic MIR transition can be implemented in a rather simple scheme, with diverse applications. For example, the approach may enable the development of highly accurate self-calibrated optical spectrometers and can also be used for direct stabilization of MIR frequency combs.
中文翻译：
迈向基于独立碱的中红外频率参考
中红外（MIR）光谱区域中的高精度光谱仪是一种多功能工具，在基础科学研究以及减轻不同领域的众多应用中引起了极大的兴趣。对MIR光谱学迅速增长的兴趣的主要驱动力是量子级联激光器（QCL）的出现。然而，截至今天，此类QCL仍在经历明显的自由运行频率波动，这使其频率稳定度具有挑战性。在这里，我们提出并实验证明了一种方法，该方法能够基于碱蒸汽的高激发态在MIR中开发频率标准。该技术基于通过使两个稳定的泵浦近红外（NIR）激光器共同传播而在MIR中生成无多普勒增益谱的基础。使用这项技术2 P 3/2 –5 2 D 5/2（（Rb）蒸气的转变，与自由运行相比，显示出明显的稳定性提高。稳定到原子MIR跃迁可以用相当简单的方案来实现，并具有多种应用。例如，该方法可以实现高度精确的自校准光谱仪的开发，也可以用于直接稳定MIR频率梳。
更新日期：2020-05-19
中文翻译：
迈向基于独立碱的中红外频率参考
中红外（MIR）光谱区域中的高精度光谱仪是一种多功能工具，在基础科学研究以及减轻不同领域的众多应用中引起了极大的兴趣。对MIR光谱学迅速增长的兴趣的主要驱动力是量子级联激光器（QCL）的出现。然而，截至今天，此类QCL仍在经历明显的自由运行频率波动，这使其频率稳定度具有挑战性。在这里，我们提出并实验证明了一种方法，该方法能够基于碱蒸汽的高激发态在MIR中开发频率标准。该技术基于通过使两个稳定的泵浦近红外（NIR）激光器共同传播而在MIR中生成无多普勒增益谱的基础。使用这项技术2 P 3/2 –5 2 D 5/2（（Rb）蒸气的转变，与自由运行相比，显示出明显的稳定性提高。稳定到原子MIR跃迁可以用相当简单的方案来实现，并具有多种应用。例如，该方法可以实现高度精确的自校准光谱仪的开发，也可以用于直接稳定MIR频率梳。
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