Markku Vainio
University of Helsinki
104 Papers
318 Citations
Markku Vainio is an academic researcher from University of Helsinki. The author has contributed to research in topics: Frequency comb & Optical parametric oscillator. The author has an hindex of 21, co-authored 97 publications. Previous affiliations of Markku Vainio include VTT Technical Research Centre of Finland & Helsinki University of Technology.
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Papers
Mid-infrared optical parametric oscillators and frequency combs for molecular spectroscopy
TL;DR: The progress of the most significant nonlinear optics instruments for widely tunable, high-resolution mid-infrared spectroscopy: continuous-wave optical parametric oscillators and difference frequency generators are reviewed.
166
Sub-parts-per-trillion level sensitivity in trace gas detection by cantilever-enhanced photo-acoustic spectroscopy
TL;DR: The ability of cantilever-enhanced photo-acoustic spectroscopy to reach sub-parts-per-trillion level sensitivity in trace gas detection is demonstrated by combining a particularly stable high-power narrow-linewidth mid-infrared continuous-wave optical parametric oscillator and a strong absorption cross-section of hydrogen fluoride.
Frequency comb generation by a continuous-wave-pumped optical parametric oscillator based on cascading quadratic nonlinearities
TL;DR: Optical frequency comb generation by a continuous-wave pumped optical parametric oscillator (OPO) without any active modulation is reported, leading to spectral broadening of the OPO signal beam via self-phase modulation.
106
Adsorption of ammonia on treated stainless steel and polymer surfaces
TL;DR: In this paper, Cavity ring-down spectroscopy with an external cavity diode laser operating in the near-infrared wavelength range was used to monitor the adsorption process in real time in continuous-flow conditions to obtain quantitative assessment of the studied surfaces.
84
Radiocarbon Dioxide detection based on Cavity Ring-Down Spectroscopy and a Quantum Cascade Laser
TL;DR: In this article, the authors used a cavity ring-down spectroscopy and a quantum cascade laser for the measurement of carbon dioxide in carbon dioxide using a standardised sample containing elevated levels of radiocarbon.
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