Dual-comb interferometry is a measurement technique that uses two laser frequency combs to retrieve complex spectra in a line-by-line basis. This technique can be implemented with electro-optic frequency combs, offering intrinsic mutual coherence, high acquisition speed and flexible repetition-rate operation. A challenge with the operation of this kind of frequency comb in dual-comb interferome...

We report a fully stabilized 1030-nm Yb-fiber frequency comb operating at a pulse repetition frequency of 375 MHz. The comb spacing was referenced to a Rb-stabilized microwave synthesizer and the comb offset was stabilized by generating a super-continuum containing a coherent component at 780.2 nm which was heterodyned with a (87)Rb-stabilized external cavity diode laser to produce a radio-freq...

Cavity-enhanced direct frequency comb spectroscopy combines broad bandwidth, high spectral resolution, and ultrahigh detection sensitivity in one experimental platform based on an optical frequency comb efficiently coupled to a high-finesse cavity. The effective interaction length between light and matter is increased by the cavity, massively enhancing the sensitivity for measurement of optical...

A revision of the Alticini genera from the Afrotropical region is reported. The paper includes the following for the flea beetle fauna occurring in Sub-Saharan Africa and Madagascar: a key to their identification; habitus photos of all the genera; microscope and scanning electron micrographs of many diagnostic morphological characters; and an updated annotated catalogue with biogeographical not...

In southern zone of cotton growing with insufficient moisture, one the leading places is occupied by develop tools which simultaneously execute technology trial forming ridges and prepare them to display cotton. The purpose research confirms design width gripper roller elastic stems. Constructive scheme comb-maker roller-comb-makers given. proposed machine includes sequentially installed comb-m...

We pump a degenerate frequency-divide-by-two optical parametric oscillator (OPO) based on orientation-patterned GaAs with a stable Tm frequency comb at 2 micrometer wavelength and measure the OPO comb offset frequency and linewidth. We show frequency division by two with sub-Hz relative linewidth of the comb teeth. The OPO thermally self-stabilizes and oscillates for nearly an hour without any ...

Two new species, Cryptophleps namibica sp. nov., from Namibia and C. buttikeri sp. nov., from Saudi Arabia are described. The following new combinations are proposed: Cryptophleps izia (Negrobov, 1973) (Asyndetus), comb. nov. (Central Asia), Cryptophleps minuta (Negrobov & Shamshev, 1986) (Asyndetus), comb. nov. (Far Eastern Asia) and Cryptophleps vivida (Negrobov & Shamshev, 1986) (Asyndetus),...

This paper describes an algorithm for real-time beat tracking with a visual interface. Multiple tempo and phase hypotheses are represented by a comb filter matrix. The user can interact by specifying the tempo and phase to be tracked by the algorithm, which will seek to find a continuous path through the space. We present results from evaluating the algorithm on the Hainsworth database and offe...

Let P be a simple polygon with n vertices. We say that P is k-guardable if it is possible to find a set of points Q consisting of interior points of edges of P such that every point of P is visible from at least k elements in Q and no edge of P has more than one element in Q. The following question was asked by A. Lubiw at the open problem session of the Fourth Canadian Conference in Computatio...

A replacement name is proposed for genus Dayus Gerken, 2001 (Crustacea: Peracarida: Cumacea), preoccupied by Dayus Mahmood, 1967 (Insecta: Hemiptera: Cicadellidae). The following changes are proposed: Jennidayus new replacement name = Dayus Gerken, 2001 (nec Mahmood 1967); Jennidayus pharocheradus (Gerken, 2001), comb. n. = Dayus pharocheradus Gerken, 2001; Jennidayus acanthus (Gerken, 2001), c...