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首页> 外文期刊>Optics Letters >Noise-immune cavity-enhanced optical heterodyne molecular spectrometry on N2O 1.283 mu m transition based on a quantum-dot external-cavity diode laser
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Noise-immune cavity-enhanced optical heterodyne molecular spectrometry on N2O 1.283 mu m transition based on a quantum-dot external-cavity diode laser

机译：基于量子点外腔二极管激光器的N2O 1.283μm跃迁的抗噪声腔增强光学外差分子光谱

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摘要

To access the wavelength within the 1.1 - 1.3 mu m region, we have developed a quantum-dot (QD) laser with an external-cavity configuration and a linewidth of kilohertz at a 1 ms integration time. The residual electroluminescence, due to the inhomogeneous broadening of the QD gain medium, was observed and filtered out using a grating. While a fiber-coupled electro-optical modulator was employed, this laser system was locked to a high-finesse (F similar to 18,500) optical cavity, and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy was used to observe weak transitions. The Doppler-broadened spectra of a weak N2O transition at 1.283 mu m are obtained with a signal-to-noise ratio of 30 for a gas pressure of 54 mTorr. The minimum noise-equivalent absorption coefficient is 5.3 x 10(-10) cm(-1) Hz(-1/2). This system can be a powerful and stable light source for atomic parity nonconservation measurements using thallium, ytterbium, lead, and iodine. (C) 2015 Optical Society of America
机译：为了获得1.1-1.3μm范围内的波长，我们开发了一种量子点（QD）激光器，该激光器具有一个外腔配置，并且在1 ms的积分时间内线宽为千赫兹。观察到残留的电致发光，这是由于QD增益介质的不均匀扩展所致，并使用光栅将其滤除。当使用光纤耦合的电光调制器时，该激光系统被锁定在高精细（F类似于18,500）光学腔上，并且使用了抗噪声腔增强光学外差分子光谱技术来观察弱跃迁。在54 mTorr的气压下，获得的N2O弱跃迁在1.283μm处的多普勒增宽光谱具有30的信噪比。最小等效噪声吸收系数为5.3 x 10（-10）cm（-1）Hz（-1/2）。该系统可以成为使用using，，铅和碘进行原子级不保守测量的强大而稳定的光源。 （C）2015年美国眼镜学会

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