| Because of high brightness,polarization characteristics,high-energy characteristics,Laser lighting system has been increasingly widely used in military investigation,medical tomography,holographic display and other fields.But the speckle problem caused by high coherence of laser has great influence on imaging quality.It has become a major obstacle to the application of laser lighting technology.Based on statistical optics,Analysis of laser speckle superposition and spatiotemporal coherence,the mathematical model of laser speckle suppression by liquid optical waveguide is established.The Monte Carlo method is used to simulate the process of light passing through the liquid core fiber.Analyze the influence of different liquid core fibers on speckle contrast.Speckle laser illumination system is designed based on liquid core fiber.Finally,we do experimental analysis.Comparing Monte Carlo simulation results,the effect of the core material and fiber length on the speckle was obtained.After measuring the laser transmittance of liquid core optical fiber,the optimal scheme is obtained.Speckle contrast reduced to 3.57%,reached the acceptable range of human eyes,light transmittance above 87%. |
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