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Sub-Doppler resolution mid-infrared spectroscopy using a difference-frequency-generation source spectrally narrowed by laser linewidth transfer

机译:亚多普勒分辨率中红外光谱法,使用通过激光线宽转移在光谱上变窄的差频产生源

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The spectral linewidth of a 3.28 mu m difference-frequency-generation source has been reduced to 3.5 kHz using a laser linewidth transfer technique [Opt. Express 21, 7891 (2013)]. We use an optical frequency comb with a broad servo bandwidth to transfer a narrow linewidth of a pump laser, a 1.06 mu m Nd:YAG laser, to a signal laser, a 1.57 mu m external-cavity laser diode. This source enables us to record the Lamb dip of the nu(3) band R(2) E transition of methane with a molecular spectral linewidth of 21 kHz while the frequency axis is absolutely calibrated. (C) 2015 Optical Society of America
机译:使用激光线宽传输技术,将3.28μm差分频率产生源的光谱线宽减小到3.5 kHz。 Express 21,7891(2013)。我们使用具有宽伺服带宽的光频率梳来将泵浦激光器(1.06微米Nd:YAG激光器)的窄线宽传输到信号激光器(1.57微米外腔激光二极管)。此源使我们能够记录甲烷的nu(3)谱带R(2)E跃迁的Lamb倾角,其分子光谱线宽为21 kHz,而频率轴是经过绝对校准的。 (C)2015年美国眼镜学会

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