Rapid-scan Fourier-transform coherent anti-Stokes Raman scattering spectroscopy with heterodyne detection.
Rapid-scan Fourier-transform coherent anti-Stokes Raman scattering spectroscopy with heterodyne detection.
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具有外差检测功能的快速扫描傅立叶变换相干反斯托克斯拉曼散射光谱。
DOI：
10.1364/ol.42.004335
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发表时间：
2017
期刊：
影响因子：
3.6
通讯作者：
K. Goda
中科院分区：
文献类型：
--
作者：
K. Hiramatsu;Yizhi Luo;T. Ideguchi;K. Goda
高速拉曼光谱在实时分析化学动力学方面变得越来越重要。为了满足这一需求，快速扫描傅里叶变换相干反斯托克斯拉曼散射(FT-CARS)光谱被开发出来，以实现超过20,000微秒扫描的宽带CARS测量/S。然而，由于每次扫描中检测到的光子数量有限，FT-CARS光谱的检测灵敏度固有地较低。在这封信中，我们展示了我们通过外差检测来增强快速扫描FT-CARS光谱灵敏度的实验证明。具体地说，我们通过将CARS电场与外部本地振荡器(LO)的干扰叠加来实现外差检测。通过简单地增加LO的功率来放大CARS信号，而不需要增加对样品的入射功率。因此，与零差检测的FT-CARS光谱相比，我们实现了信号强度和信噪比分别提高了39倍和5倍。灵敏度改进的快速扫描FT-CARS光谱有望在内燃机和活生物细胞等广泛的环境中实现对化学动力学的灵敏实时观察。
High-speed Raman spectroscopy has become increasingly important for analyzing chemical dynamics in real time. To address the need, rapid-scan Fourier-transform coherent anti-Stokes Raman scattering (FT-CARS) spectroscopy has been developed to realize broadband CARS measurements at a scan rate of more than 20,000 scans/s. However, the detection sensitivity of FT-CARS spectroscopy is inherently low due to the limited number of photons detected during each scan. In this Letter, we show our experimental demonstration of enhanced sensitivity in rapid-scan FT-CARS spectroscopy by heterodyne detection. Specifically, we implemented heterodyne detection by superposing the CARS electric field with an external local oscillator (LO) for their interference. The CARS signal was amplified by simply increasing the power of the LO without the need for increasing the incident power onto the sample. Consequently, we achieved enhancement in signal intensity and the signal-to-noise ratio by factors of 39 and 5, respectively, compared to FT-CARS spectroscopy with homodyne detection. The sensitivity-improved rapid-scan FT-CARS spectroscopy is expected to enable the sensitive real-time observation of chemical dynamics in a broad range of settings, such as combustion engines and live biological cells.
影响因子：
64.8
作者：
Ideguchi, Takuro;Holzner, Simon;Haensch, Theodor W.
通讯作者：
Haensch, Theodor W.