Abstract
Highly stable and spectrally pure laser sources are crucial for a wide range of demanding applications, including frequency metrology, precision tests of fundamental physics, and high-resolution spectroscopy in the mid-infrared region of the electromagnetic spectrum, where intense ro-vibrational transitions of many molecules are present. Among the mid-infrared sources, OPOs combine in the same device unique features, such as high power, single mode emission, tunability and wide spectral coverage, thus proving their suitability for high-sensitivity spectroscopy [1,2]. A large number of visible and near infrared lasers have been narrowed down to sub-Hertz-linewidth and their frequency absolutely stabilized up to the level of the best optical frequency standards, while sub-kHz narrowing of mid-infrared sources is limited to a couple of gas lasers and more recently to quantum cascade lasers.
© 2015 IEEE
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