在目标分子吸收波长上产生片上中红外色散波

IF 5.4 1区 物理与天体物理 Q1 OPTICS APL Photonics Pub Date : 2024-08-22 DOI:10.1063/5.0221176
Seong Cheol Lee, Soobong Park, Daewon Suk, Joonhyuk Hwang, Kiyoung Ko, Won Bae Cho, Duk-Yong Choi, Kwang-Hoon Ko, Fabian Rotermund, Hansuek Lee
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引用次数: 0

摘要

中红外波段是分子监测和控制领域最重要的光谱范围之一,这是因为许多分子都有很强的特征吸收模式。在各种中红外光源中,片上超连续光源因其空间相干性高、光谱带宽宽、体积小和色散可控性强而备受关注。然而,要产生延伸到分子指纹区域的超连续,通常需要复杂光学系统提供高能量的中红外泵浦脉冲。相比之下,使用 1550 nm 泵浦源产生的超连续波通常更为紧凑,但进入分子指纹区的机会有限。在这项研究中,我们开发了一种片上超连续光源,它使用约 25 pJ 的耦合泵浦能量在高达 4800 nm 的目标波长上产生色散波。波长为 2340 nm 的泵浦脉冲由一个相对紧凑的 Cr:ZnS 激光振荡器产生。生成的色散波波长与数值预测波长非常吻合。为了证明所产生的色散波在光谱学上的适用性,对 12CO2、13CO2 和 N2O 的基本振动模式进行了分子吸收光谱分析。此外,通过对测量到的吸收光谱进行倒频谱分析,对它们的压力进行了定量估算。测得压力的不确定性接近于根据 HITRAN 数据库中吸收线形状参数的不确定性确定的理论极限,这证明了这种中红外光源在高级光谱应用方面的潜力。
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On-chip mid-infrared dispersive wave generation at targeted molecular absorption wavelengths
The mid-infrared wavelength region is one of the most important spectral ranges for a variety of applications in monitoring and controlling molecules due to the presence of strong characteristic absorption modes of many molecules. Among various mid-infrared light sources, on-chip supercontinuum sources have garnered significant attention for their high spatial coherence, broad spectral bandwidth, compact size, and dispersion controllability. However, generating a supercontinuum that extends into the molecular fingerprint region typically requires high-energy mid-infrared pump pulses from complex optical systems. In contrast, supercontinuum generated with 1550 nm pump sources, which are generally more compact, has shown limited access to the molecular fingerprint region. In this study, we developed an on-chip supercontinuum source with a dispersive wave generated at a targeted wavelength of up to 4800 nm using a coupled pump energy of about 25 pJ. The pump pulses at a wavelength of 2340 nm were generated from a relatively compact Cr:ZnS laser oscillator. The wavelengths of the generated dispersive waves closely matched the numerically predicted wavelengths. To demonstrate the applicability of the generated dispersive waves for spectroscopic purposes, molecular absorption spectroscopy was performed on the fundamental vibrational modes of 12CO2, 13CO2, and N2O. In addition, their pressures were quantitatively estimated using cepstrum analysis on the measured absorption spectra. The uncertainty in the measured pressure was close to the theoretical limit determined by the uncertainties in the absorption line shape parameters in the HITRAN database, demonstrating the potential of this mid-infrared light source for advanced spectroscopic applications.
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来源期刊
APL Photonics
APL Photonics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍: APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.
期刊最新文献
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