Volume absorption laser energy meter for high energy laser by water absorption |
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Authors: | Ji Feng Wei Li Qun Sun Kai Zhang |
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Institution: | 1. State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, 100084, Beijing, People’s Republic of China 2. Institute of Applied Electronics, China Academy of Engineering Physics, 621900, Mianyang, People’s Republic of China
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Abstract: | Since the energy density of high energy laser can be extremely high and destructive, it is difficult to directly measure the laser energy with custom methods. A volume absorption method directly using water as absorption substance is introduced. In the energy meter, water is pumped into an absorption cavity sealed by a quartz window, and energy increment of water by laser is calculated. The new energy meter has excellent power and energy linearity and is almost not affected by power, energy and flow, its relative deviation to norm middle-power energy meter is 1.9 %, which infers that the new energy meter can measure higher laser energy and maintain higher precision as well. |
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