https://www.euro-online.org/enog/inoc2007/Papers/mac-slots.html https://www.euro-online.org/enog/inoc2007/Papers/m https://www.euro-online.org/enog/inoc2007/Papers/mac-slots.html

Frequency-agile laser frequency combs enable real-time NIR spectroscopy

A team of scientists from the Max Planck Institute of Quantum Optics and Ludwig-Maximilians-Universität Munich (Germany), the Laboratoire Interdisciplinaire Carnot de Bourgogne (France) and the Institut des Sciences Moléculaires d’Orsay (France) report a promising new technique for high-speed and accurate near infrared spectroscopy in Nature Photonics. They use modulators and a non-linear optical fibre to produce two frequency combs, each with more than a thousand evenly spaced infrared spectral lines with a remarkably flat intensity distribution. Line spacing and spectral position can be selected quickly and freely by simply dialling a knob. Such frequency-agile optical combs offer unprecedented freedom when interrogating a molecular spectrum via a powerful technique called multiplexed dual-comb spectroscopy. Two mutually coherent combs are combined in an interferometer. High refresh rates (80 kHz) and tuning speeds (10 nm s–1) at high signal-to-noise ratio are achieved. Such a unique combination holds much promise for trace gas sensing. “Furthermore, the frequency-agile frequency comb generator might also become an enabling tool for applications beyond spectroscopy, like for arbitrary waveform generation, radio-frequency photonics, optical coherence tomography or microscopy”, concludes Dr Ming Yan, a post-doc working at the experiment.

Techniques: 

News Blog Archive

Latest NIR Events

7 May 2019 to 9 May 2019
Beijing, China
8 July 2019 to 12 July 2019
Auckland, New Zealand
15 September 2019 to 20 September 2019
Gold Coast, Australia