• Optics and Precision Engineering
  • Vol. 32, Issue 13, 2081 (2024)
Saisai XUE*, Xiaoguang GUO, Yufan JIA, Shang GAO, and Renke KANG
Author Affiliations
  • State Key Laboratory of High-Performance Precision Manufacturing, Dalian University of Technology, Dalian116024, China
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    DOI: 10.37188/OPE.20243213.2081 Cite this Article
    Saisai XUE, Xiaoguang GUO, Yufan JIA, Shang GAO, Renke KANG. Double-sided lapping uniformity of LiTaO3 based on three-dimensional trajectory of particles[J]. Optics and Precision Engineering, 2024, 32(13): 2081 Copy Citation Text show less

    Abstract

    To enhance the uniformity of material removal for lithium tantalate (LiTaO3, LT) wafers, a model based on the three-dimensional micro-cutting of abrasive particles was developed. The model starts by analyzing the brittle and plastic removal mechanisms of LiTaO3 crystals, alongside the distribution of abrasive particles on the lapping pad. Using a force balance equation, it calculates the penetration depth and chip cross-section for each abrasive particle. A kinematic analysis subsequently derives the trajectory of these particles during double-sided lapping, leading to the establishment of the material removal uniformity model. Simulations were conducted to assess the effects of the speed ratios between the gear ring and the sun wheel (m) and between the gear ring and the lower plate (n) on material removal uniformity. Following this, experiments were performed on LiTaO3 wafers, measuring the Total Thickness Variation (TTV) across different speed ratios m and n to validate the model. Results indicate that the uniformity of material removal is significantly influenced by these speed ratios, achieving optimal uniformity at m=0.85 and n=1.3, resulting in a TTV of 0.83 μm. The experimental findings align with the simulation, demonstrating the model's potential to guide improvements in the double-sided lapping uniformity of LiTaO3 wafers.
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    Nz=23πr2CSωρS2D2(16)

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    Saisai XUE, Xiaoguang GUO, Yufan JIA, Shang GAO, Renke KANG. Double-sided lapping uniformity of LiTaO3 based on three-dimensional trajectory of particles[J]. Optics and Precision Engineering, 2024, 32(13): 2081
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