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Method for measuring high energy laser energy parameter based on light pressure principle and apparatus thereof

A high-energy laser and principle technology, applied in the field of high-energy laser parameter measurement, can solve problems such as difficult continuous wave high-energy laser parameter measurement, achieve wide applicability, and improve the effect of cost-effectiveness

Active Publication Date: 2012-01-18
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

The device does not interrupt the beam in application, and can realize online monitoring of laser energy parameters, but the problem is that due to the twisted structure, it can only be used for the measurement of pulsed lasers, and it is difficult to be used for the measurement of continuous wave high-energy laser parameters.

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  • Method for measuring high energy laser energy parameter based on light pressure principle and apparatus thereof
  • Method for measuring high energy laser energy parameter based on light pressure principle and apparatus thereof
  • Method for measuring high energy laser energy parameter based on light pressure principle and apparatus thereof

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Embodiment Construction

[0048] The present invention proposes a high-energy laser energy parameter measurement method based on the measurement of dynamic light pressure. The high-energy laser is incident on the reflector 5 with the deformed rod 6, and the multi-point dynamics of the reflector 5 under the laser light pressure are accurately measured. Displacement, parameters such as laser energy are calculated.

[0049] According to the classical electromagnetic field equation, it can be calculated that when light is incident on a total reflection surface, the light pressure F and light power I on the reflection surface can be expressed as

[0050] F=2·I·cosθ / c (1)

[0051] Among them: c is the speed of light; θ is the angle between the incident direction of light and the normal of the reflecting surface. For a 200kW high-energy laser, the pressure brought about by the vertical incidence to the mirror reflection is about 136 mg. If the dynamic range of the measurement system is estimated to be 100 ti...

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Abstract

The invention discloses a method for measuring a high energy laser energy parameter based on a light pressure principle and an apparatus thereof. The method comprises the following steps: a reflector and a deformation rod are arranged on a high energy laser incidence optical path, a plurality of displacement sensors are provided at a back side of a reflector laser incidence direction, micrometricdisplacement of the reflector caused by light pressure in a laser light extraction process is measured in real time, a light pressure value generated by laser is solved, and parameters of the laser such as average power, energy, P-t curve, light spot center of mass change and the like are calculated. According to the method and the apparatus in the invention, light beam is not blocked in usage, an on-line measurement of undistributed transmission of high energy laser is realized, cost-effectiveness of an experiment is raised, simultaneously, a measurement system does not need to bear strong laser irradiation, and the method and the apparatus can be used for high power laser parameter measurement.

Description

technical field [0001] The invention relates to a method and device for measuring laser energy parameters, in particular to a method and device for measuring high-energy laser parameters based on the principle of light pressure. Background technique [0002] High-energy lasers refer to lasers with an average power greater than 10,000 watts, a duration of more than several seconds, and an output energy of more than tens of thousands of joules. They have important industrial and military application prospects. The output energy of a high-energy laser is an important parameter to characterize the efficacy of the laser, and the absolute measurement of the output energy of the high-energy laser is usually performed by the thermal absorption method. The principle is that after the incident laser energy is absorbed by the absorber, the light energy is converted into heat energy, and the absolute energy of the incident laser is calculated by measuring the temperature rise of the tem...

Claims

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Application Information

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IPC IPC(8): G01J1/56
Inventor 陈绍武叶锡生刘晶儒吴勇刘卫平杨鹏翎张磊
Owner NORTHWEST INST OF NUCLEAR TECH
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