Square array CCD detector is widely used in image acquisition, photoelectric measurement and other fields. However, its inherent dynamic range is affected by noise and saturation crosstalk effect, which can not meet the application requirements of laser jamming effect measrement. In this paper, an image date fusion method based on linear compensation and orthogonal compensation is proposed. By controlling the jamming laser power, collecting multi-frame laser jamming effect images, and making full use of the effective measurement information in the image for compensation, the target laser energy distribution data with lager dynamic range can be obtained. In the experiment, the laser energy distribution on the target surface diffracted by circular aperture and rectangular aperture is inversed respectively, and the dynamic range is expanded by 40dB.
The beam quality factor (M2 parameter) of output laser in a three-core and seven-core conventional photonic lantern excited by incoherent sources is analyzed based on analytical and numerical method. Theoretical results show that the limitation of output laser beam quality is M2=1.75 for a three-core photonic lantern and M2=2.70 for a seven-core photonic lantern. Both the mode evolution process and beam quality factors of these two kinds of photonic lanterns are verified by numerical calculations. It is shown that good beam quality of the theoretical limitations can be realized only if the adiabatic conditions are satisfied very well. These results are very meaningful for practical application of high brightness incoherent beam combining based on conventional photonic lanterns.
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