Multi-gas dual-comb spectroscopy with tunable gain-switched laser diodes.

This study presents a tunable multi-gas spectroscopic scheme using a dual-comb architecture operating within the near-infrared domain. The dual-comb signal is generated by two gain-switched Fabry-Perot laser diodes at low repetition rates and externally injected by a tunable laser source. A systematic study on the injection wavelength, line spacing and optical span performed over the system, ensures the generation of stable optical frequency combs with a 40 GHz bandwidth, and more than 400 lines at a low repetition rate (100 MHz).

Complete chloroplast genome of the marine eelgrass (Zosteraceae, Plantae) from Monterey, California.

We present the complete chloroplast genome of the eelgrass from Monterey, California. The genome is circular and 144,675  bp in length. It consists of 82 protein-coding, 31 transfer RNA, and 8 ribosomal RNA genes and is 99.

Comparison of direct and indirect models of early induced acute lung injury.

Background: The animal experimental counterpart of human acute respiratory distress syndrome (ARDS) is acute lung injury (ALI). Most models of ALI involve reproducing the clinical risk factors associated with human ARDS, such as sepsis or acid aspiration; however, none of these models fully replicates human ARDS.

Aim: To compare different experimental animal models of ALI, based on direct or indirect mechanisms of lung injury, to characterize a model which more closely could reproduce the acute phase of human ARDS.

Gain-switched semiconductor lasers with pulsed excitation and optical injection for dual-comb spectroscopy.

In this work we demonstrate the capability of two gain-switched optically injected semiconductor lasers to perform high-resolution dual-comb spectroscopy. The use of low duty cycle pulse trains to gain switch the lasers, combined with optical injection, allows us to obtain flat-topped optical frequency combs with 350 optical lines (within 10 dB) spaced by 100 MHz. These frequency combs significantly improve the spectral resolution reported so far on dual-comb spectroscopy with gain-switched laser diodes.

Enhanced optical frequency comb generation by pulsed gain-switching of optically injected semiconductor lasers.

We report on the experimental generation of broad and flat optical frequency combs (OFC) in a 1550 nm laser diode using gain switching with pulsed electrical excitation together with optical injection. The combination of both techniques allows the generation of high-quality OFCs at a repetition frequency of 500 MHz, showing a low-noise optical spectrum with unprecedent features in terms of width (108 tones within 10 dB) and flatness (56 tones within 3 dB) in comparison with those previously reported for this modulation frequency. The influence of the injection conditions on the OFC quality is studied.