| Citation: | TANG Zuo, WANG Xiao-heng, MAO Ye-fei, ZHAO Ruo-chen, ZHAO Bao-zhen, CHANG Hui-cong, YANG Chang, XIAO Lin. Intense light interference suppression technique based on regional flipping of digital micromirror device[J]. Chinese Optics. doi: 10.37188/CO.2025-0095
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To address the interference and dazzling threats posed by high-power lasers to the imaging of detectors, this paper proposes and validates a dynamic laser interference suppression method based on regional flipping of digital micromirror device (DMD). This method employs a secondary imaging optical path, placing the DMD at the primary image plane. Through real-time identification and flipping of micromirrors corresponding to the laser interference region, high-power interference energy is deflected out of the main optical path, thereby protecting the detector while retaining effective image information of most of the field of view. First, we verified the feasibility of this scheme through optical simulations, and subsequently built an experimental platform for systematic testing. Furthermore, this study quantifies the influence of the mask radius controlling DMD flipping on the suppression effect, verifying that the optimal suppression effect is achieved when the flipped region is larger than the interference spot. Experimental results demonstrate that DMD regional flipping nethod can effectively suppress laser interference across different laser powers and incident angles. Compared with the scenario without suppression, the interference power received by the detector is significantly reduced: when laser incidence is off-axis, the laser interference resistance threshold is increased by more than 28.5 dB; when laser interference occurs with incidence parallel to the optical axis, the laser interference resistance threshold can be enhanced by more than 30 dB. In comparison with traditional image processing methods, this method can retain the maximum amount of image information under strong light jamming scenarios. Technology provides an efficient and concise solution for photoelectric systems to maintain stable imaging in strong light interference environments.
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