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By using free-running femtosecond OPOs with a repetition-rate difference of ∼500 Hz we demonstrate methane absorption spectroscopy at a resolution < 0.08 cm−1, fully calibrated in the optical domain from repetition-rate and carrier-envelope-offset frequency measurements.
Dual-comb spectroscopy (DCS) [1] uses asynchronous broadband coherent sources to achieve Fourier-transform-like spectroscopy but with no moving parts and near-kHz acquisition rates [2]. Here we demonstrate dual-comb mid-infrared spectroscopy of methane gas using two free-running optical parametric oscillators (OPOs) with a repetition-rate difference of 500 Hz and complete optical calibration from...
By using free-running femtosecond optical parametric oscillators with a repetition-rate difference > 200 Hz we demonstrate methane absorption spectroscopy at a resolution < 0.2 cm−1 and simultaneously covering the P, Q and R branches.
Despite the prevalence of fiber frequency combs around 1.5 μm, few fully stabilized frequency combs have been demonstrated around 1.0 μm, despite the generally superior performance of Yb-fiber lasers compared to Er-fiber lasers [1]. Short pulses are to generate coherent supercontinuum using anomalous dispersion regime of microstructured fibers [2]. Near-zero cavity dispersion is highly desirable for...
In this paper, we introduce a natural way of how to find preimages on a hash function by using a rainbow table even if the hash function utilizes the Merkle-Daringmgard (MD) strengthening as a padding procedure. To overcome the MD strengthening, we identify the column functions as representatives of certain set of preimages, unlike conventional usage of rainbow tables or Hellman tables to invert one-way...
This paper presents a method for removing electroocular (EOG) artifacts in the electroencephalogram (EEG). The procedure is based on blind source separation (BSS) and, in contrast to methods already available in the literature, it is completely automated and does not require the availability of peri-ocular EOG electrodes. The proposed approach removed most EOG artifacts in 6 long-term EEG recordings...
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