24 October 2017 Research on temperature characteristics of laser energy meter absorber irradiated by ms magnitude long pulse laser
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Proceedings Volume 10457, AOPC 2017: Laser Components, Systems, and Applications; 104571S (2017) https://doi.org/10.1117/12.2284478
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
Abstract
The research on temperature characteristics for large-energy laser energy meter absorber is about continuous wave (CW) laser before. For the measuring requirements of millisecond magnitude long pulse laser energy, the temperature characteristics for absorber are numerically calculated and analyzed. In calculation, the temperature field distributions are described by heat conduction equations, and the metal cylinder cavity is used for absorber model. The results show that, the temperature of absorber inwall appears periodic oscillation with pulse structure, the oscillation period and amplitude respectively relate to the pulse repetition frequency and single pulse energy. With the wall deep increasing, the oscillation amplitude decreases rapidly. The temperature of absorber outerwall is without periodism, and rises gradually with time. The factors to affect the temperature rise of absorber are single pulse energy, pulse width and repetition frequency. When the laser irradiation stops, the temperature between absorber inwall and outerwall will reach agreement rapidly. After special technology processing to enhance the capacity of resisting laser damage for absorber inwall, the ms magnitude long pulse laser energy can be obtained with the method of measuring the temperature of absorber outerwall. Meanwhile, by optimization design of absorber structure, when the repetition frequency of ms magnitude pulse laser is less than 10Hz, the energy of every pulse for low repetition frequency pulse sequence can be measured. The work offers valuable references for the design of ms magnitude large-energy pulse laser energy meter.
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Nan Li, Nan Li, Chunhong Qiao, Chunhong Qiao, Chengyu Fan, Chengyu Fan, Jinghui Zhang, Jinghui Zhang, Gaochao Yang, Gaochao Yang, } "Research on temperature characteristics of laser energy meter absorber irradiated by ms magnitude long pulse laser", Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104571S (24 October 2017); doi: 10.1117/12.2284478; https://doi.org/10.1117/12.2284478
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