Simply-integrated dual-comb spectrometer via tunable repetition rates and avoiding self-referencing.
Simply-integrated dual-comb spectrometer via tunable repetition rates and avoiding self-referencing.
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DOI：
10.1364/oe.25.008063
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发表时间：
2017-04
期刊：
影响因子：
3.8
通讯作者：
Honglei Yang;Haoyun Wei;Kun Chen;Shengkang Zhang;Yan Li
中科院分区：
文献类型：
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作者：
Honglei Yang;Haoyun Wei;Kun Chen;Shengkang Zhang;Yan Li
简化集成的双梳状系统在下一阶段的现场部署应用中起着至关重要的作用。在这里，我们展示了一个自制的双梳光谱仪，满足这一要求的基础上，光稳定的铒光纤频率梳。嵌入式大运动跨度自动光学延迟线突出了简化的集成和可操作性，从而实现了1.7 MHz的连续重复率调谐范围，并避免了多次光纤削减。这就放宽了第二次同频梳状重复，从而简化了双梳状系统的集成。通过泵浦电流调制，实现了对普通窄线宽参考激光的光锁相，提高了互相干性。在1.5 μm波段获得了乙炔12 C2 H2分子的吸收特性，变迹线宽为0.076 cm-1。当吸收路径为7.5 cm，气压为100 Torr时，在90 cm-1的光谱带宽内，平均信噪比达到280，相应的噪声等效吸收系数为3.7 × 10-6 cm-1·Hz-1/2。通过与HITRAN数据库的对比，进一步证实了反演光谱的准确性。
Dual-comb system with simplified integration acts a crucial role in the next stage of field-deployable application. Here we demonstrate a home-made dual-comb spectrometer that meets this requirement based on optically stabilized erbium-fiber frequency combs. The simplified integration and operability are highlighted by the embedded large motion-span automatic optical delay line that resulted in 1.7 MHz of continuous repetition rate tuning range and avoid multiple fiber cutbacks. This relaxes the second similar frequency comb duplication, therefore simplifies dual-comb system integration. The mutual coherence was enhanced by optical phase lock to a common narrow-linewidth reference laser via pump current modulation. We acquired the absorption feature of acetylene 12C2H2 molecule in 1.5 μm region with an apodized instrument linewidth of 0.076 cm-1. The mean signal-to-noise ratio within a spectral bandwidth of 90 cm-1 achieved 280, and the corresponding noise equivalent absorption coefficient was 3.7 × 10-6 cm-1·Hz-1/2 for an absorption path of 7.5 cm and a pressure of 100 Torr. The accuracy of the retrieved spectrum was further confirmed by comparing with HITRAN database.