We are reporting on easily-made, flexible, wearable, and stretchable holographic gratings for tunable distributed-feedback lasers. The laser device is formed by the integration of a reflection volume phase grating in flexible substrate. recorded photopolymerizable mixture using optical holography. photopolymerizing material new compound derived from recently developed which based largely haloal...

We report the development of a differential absorption lidar instrument (DIAL) designed and built specifically for the measurement of anthropogenic greenhouse gases in the atmosphere. The DIAL is integrated into a commercial astronomical telescope to provide high-quality receiver optics and enable automated scanning for three-dimensional lidar acquisition. The instrument is portable and can be ...

BACKGROUND: Before December 2019, white lung patients with symptoms similar to COVID-19 pneumonia were found in the United States and some European countries. After was diagnosed Wuhan, China, almost all countries or regions world have successively reported cases of pneumonia. 2020 is most critical year for mankind fight against new crown epidemic. There are many prevention control measures ado...

Miniaturized laser sources with low threshold power are required for integrated photonic devices. Photostable core/shell nanocrystals well suited as gain material and their properties can be exploited by direct patterning distributed feedback (DFB) lasers. Here, the 2nd-order DFB resonators tuned to photoluminescence wavelength of QDs used. Soft lithography based on template-assisted colloidal ...

A dual fluidized bed (DFB) gasification process is proposed to produce sustainable reducing gas for the direct reduction (DR) of iron ore. This novel steelmaking route compared with established DR, which based on natural gas, and emerging DR technology using electrolysis-generated hydrogen as gas. The DFB-DR found that meets requirement reactor, existing MIDREX plants, produced an energetic eff...

Steam gasification enables the thermochemical conversion of solid fuels into a medium calorific gas that can be utilized for synthesis advanced biofuels, chemicals or heat and power production. Dual fluidized bed (DFB) is at present technology applied to realize biomass in steam environment large scale. Few large-scale DFB gasifiers exist, this work presents compilation analysis data operationa...

Exploiting the outstanding performance of optical atomic clocks for improved timekeeping, relativistic geodesy, and fundamental physics beyond standard model demands comparing distant state-of-the-art clocks. Interferometric fiber links have been demonstrated as an eminent method such frequency comparisons over distances up to thousands kilometers. However, distances, attenuation mandates signa...

We have generated picosecond opfic1 pulses with very pure spectral characteristics using semiconductor lasers with monolithic cavities. Fx repetition rates less than 10 GHz, gain-switching of DFB lasers with quantum well loss-gratings is usul. Monolithic colliding pulse mode-locked semiconductor lasers are used to generate short pulses with repetition rate up to 350GHz.