Real-time monitoring method for large-size laser faculae

Abstract

The invention relates to a real-time monitoring method for large-size laser faculae. The real-time monitoring method is characterized by comprising the following steps of: based on the linear transformation on a main light beam by using a beam expanding system behind a spectroscope, carrying out a calibration experiment, calculating a calibration linear transformation factor M, and characterizing the relative distribution of power density of target surface faculae by using reference light faculae through the calibration linear transformation factor M; and meanwhile, carrying out power sampling on local regions of the target surface faculae, and carrying out conversion to obtain laser-to-target power P0 by combining the percentage of grayscale values Di of corresponding regions of reference light faculae images accounting for the grayscale sum D0 of the images. According to the real-time monitoring method for the large-size laser faculae, another beam expanding system is not required for being introduced into a reference light path; and meanwhile, the requirements on related technical indicators of a laser power meter are reduced, the experiment cost is reduced, the complexity of an experimental system is reduced, and the density distribution of power from a large-size laser to a target can be monitored in real time, so that the real-time monitoring method is simple and feasible.

Description

technical field [0001] The invention relates to a method for measuring a strong laser spot, in particular to a real-time monitoring method for the temporal and spatial distribution of a large-scale laser spot. Background technique [0002] Laser spot measurement, especially to obtain the spatiotemporal distribution characteristics of the laser-to-target power density, is very important in the study of the irradiation effect of intense laser on the target, and it may determine the main physical mechanism of the interaction between the laser and the target. The commonly used method is to separate a weak beam of reference light through the beam splitter in the main optical path, record the reference light spot in real time by the camera, and calibrate the percentage of the laser power at the target surface to the total output power of the laser to obtain the laser to Absolute spatiotemporal distribution of target power density. The application of this monitoring method obvious...

AI Technical Summary

Problems solved by technology

The current method for monitoring the temporal and spatial distribution of laser-to-target power density encounters great difficulties in realizing the above two prerequisites

(1) It is difficult to establish a conjugate surface of the target surface on the optical path of the reference light

Because of the size limitation of the beam splitter, the beam splitter is generally placed before the beam expander system of the main optical path; unless another set of the same beam expander system is used, there will be no conjugate surface of the target surface on the reference beam optical path, which is undoubtedly Will increase experimental cost and system complexity

(2) It is difficult to find a power meter with a suitable caliber to receive all the beams at the target surface to calibrate the percentage of the laser power at the target surface to the total output power of the laser

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