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Fiber Gas Amplifier in CO2-Filled Hollow-Core Fiber and its Self-Absorption Phenomenon

Abstract

Fiber gas laser based on hollow-core fiber is a novel and potential method to emit mid-infrared output. Here, we firstly demonstrate the fiber gas amplifier in CO2-filled hollow-core fiber. Through the research of the fiber gas amplifier, self-absorption phenomenon is observed. 4.3 mu m locates near the strong absorption wavelength band of CO2. As the increase of gas pressure and the injected pump power, 4.3 mu m laser generated by four absorption lines from 00001-20012 can be absorbed. The strength of the absorption depends on the wavelength difference between the output wavelength and the absorption wavelength. This research proves the way for improving the conversion efficiency of fiber gas lasers filled with CO2 by avoiding the self-absorption effect of CO2.

article Article

date_range 2024

language English

link Link of the paper

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Wang Zefeng

Cui Yulong

Huang Wei

Zhou Zhiyue

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Featured Keywords

Optical fiber amplifiers

Gas lasers

Fiber lasers

Absorption

Pump lasers

Semiconductor lasers

Laser excitation

Fiber gas lasers

hollow-core fiber

amplifier

self-absorption

carbon dioxide

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

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