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- W2077726099 abstract "Cavity mirrors of high power lasers are easily damaged by heat absorption of laser beam, so there is an urgent need to detect the absorption coefficient of the coating layers on them. High power combustion drived lasers, which operate with large size cavity mirrors, high gas consumption and short running time, cannot offer a convenient source of radiation for studies of absorption coefficient. Other kinds of lasers cannot achieve the high power density required easily. To solve this problem, in this paper, a small-scale and cost-effective laser source is described to detect the absorption coefficient under high power density with a Quasi-Closed Cavity. This laser source is rebuilt on the basis of a 1000W-class Direct Current (DC)-discharge drived continuous-wave (CW) HF/DF chemical laser. At first, the structure of the laser source is introduced. Then, some performance parameters are measured and the experiment results are analyzed. The laser operated with a (He+NF<sub>3</sub>)+D<sub>2</sub> gas mixture, and output of about 126W with a transmission of 3% was achieved through the experiment, corresponding to an electrical efficiency of about 3%. Power density on the surfaces of mirrors under test reached 3.74 kW/cm<sup>2</sup> . It satisfies the requirement of the Quasi-Closed Cavity test well. Experimental results show that this improved DC-discharge drived CW HF/DF chemical laser is applicable as the laser source to detect the absorption coefficient under high power density." @default.
- W2077726099 created "2016-06-24" @default.
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- W2077726099 date "2014-11-20" @default.
- W2077726099 modified "2023-10-13" @default.
- W2077726099 title "Preliminary studies of a laser source used to test mirrors under high power density with a closed cavity" @default.
- W2077726099 doi "https://doi.org/10.1117/12.2072402" @default.
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