3 kW passive-gain-enabled metalized Raman fiber amplifier based on passive gain

Raman fiber lasers (RFLs) are currently promising and versatile light sources for a variety of applications. So far, operations of high power and brightness-enhanced RFLs have absorbed enormous interests along with rapid progress. Nevertheless, the stable Raman lasing at high power levels remains challenged by the thermal effects. In an effort to realize more effective thermal management in high power RFLs, here we demonstrate, for the first time, an all-fiberized RFA employing metal-coated passive fiber enabling high power lasing. By employing aluminum to the cladding of graded-index (GRIN) passive fiber, the thermal abstraction of the laser devices is more sufficient to support low-temperature operation. The maximum output power reaches 3.083 kW at 1130 nm with a conversion efficiency of 78.7%. To the best of our knowledge, this is the first Raman laser generation based on metal-coated passive fiber. Meanwhile, it is also the highest power attained in the fields of all kinds of Raman lasers based on merely nonlinear gain

Comparative characterization of putative chitin deacetylases from <i>Tetranychus cinnabarinus</i>

Considering the challenges of controlling carmine spider mite and protecting pollinators, chitin deacetylase genes (TecCDA1 and TecCDA2) of spider mite were characterized as group I, and were expressed in stage-specific pattern, which imply their role during development. The differences in sequences and structures between T. cinnabarinus and honeybee CDAs offer possibilities to design new selective pesticides protecting pollinator honeybees.</p

Pure passive fiber enabled highly efficient Raman fiber amplifier with record kilowatt power

Kilowatt-level high efficiency all-fiberized Raman fiber amplifier based on pure passive fiber is proposed for the first time in this paper. The laser system is established on master oscillator power amplification configuration while a piece of graded-index passive fiber is utilized as stokes shifting as well as gain medium, which is entirely irrelevant to rare-earth-doped gain mechanism. When the pump power is 1368.8 W, we obtained 1002.3 W continuous-wave laser power at 1060 nm with the corresponding optical-to-optical efficiency of 84%. The beam parameter M2 improves from 9.17 of the pump laser to 5.11 of the signal laser through the amplification process, and the brightness enhancement is about 2.57 at maximum output power as a consequence of the beam clean-up process in the graded-index fiber. To the best of our knowledge, we have demonstrated the first kilowatt-level high efficiency Raman fiber amplifier based on pure passive fiber with brightness enhancement

Correlations between IC and MVD from different components and types of HAE lesions.

Correlations between IC and MVD from different components and types of HAE lesions.</p

Example of image set of a patient with an AE on the right lober of liver.

<p>Two modes of images obtained by DECT: (a) conventional contrast enhanced CT images shows hypoattenuating lesion with center scattered hyperattenuating calcifications in the portal venous phase and faint enhancement of fibroinflammatory components surrounding the parasitic; (b) while this faint enhancement is more directly and strikingly on DECT contrast enhanced mixed iodine overlay images (arrowheads).</p

High power highly stable passively Q-switched fiber laser based on monolayer graphene

We demonstrate a monolayer graphene based passively Q-switched fiber laser with three-stage amplifiers that can deliver over 80 W average power at 1064 nm. The highest average power achieved is 84.1 W, with pulse energy of 1.67 mJ. To the best of our knowledge, this is the first time for a high power passively Q-switched fiber laser in the 1 um range reported so far. More importantly, the Q-switched fiber laser operates stably during a week few-hours-per-a-day tests, which proves the stability and practical application value of graphene in high power pulsed fiber lasers

Visualization 1: Kilowatt-level fiber amplifier with spectral-broadening-free property, seeded by a random fiber laser

The change of beam profile recorded when the output power gradually increases from 350 W to 630 W Originally published in Optics Letters on 15 November 2015 (ol-40-22-5311

Relevant data underlying the findings described in manuscript.

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Quantitative assessment of IC parameters for types of HAE lesions^*.

<p>Quantitative assessment of IC parameters for types of HAE lesions^{<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0149440#t002fn002" target="_blank">*</a>}.</p

DECT image of HAE in right lober of a 42-year-old man.

<p>Iodine overlay image shows iodine distribution superimposed on virtually non-enhanced dataset. Region of interest (1) is on HAE lesion. Display includes mean attenuation measurement on virtually non-enhanced and iodine image, SD of these attenuation measurements, and iodine concentration in milligrams per milliliter. In this solid component of HAE lesion iodine concentration is 0 mg/ml.</p