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Aspheric lens processing of chalcogenide glass via combined PGM-SPDT process

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Abstract

Chalcogenide glass (ChG) is widely studied due to its wide infrared transmission window, low refractive index temperature coefficient, and low dispersion coefficient. Precision glass molding (PGM) and single-point diamond turning (SPDT) are representative high-efficiency and high-precision methods for ChG processing. However, the high softening degree of ChG under high-temperature conditions leads to abnormal gas release and severe mold adhesion which deteriorate surface quality. Although SPDT typically facilitates high-precision machining, it has limited efficacy in long-term, large-area, large-depth processing; this limitation causes severe tool wear due to the high hardness and brittleness of ChG material. A new process combining the advantages of PGM and SPDT technology is proposed to fabricate aspheric lenses on ChG (IRG202) by ultra-precision and high-efficiency machining. The pre-molding of ChG by PGM reduces cutting loss during aspheric lens machining by SPDT. The machined aspheric lenses have the high quality with a form error of PV 103.5 nm and surface roughness Ra of 8.3 nm. The processing efficiency of each single lens is increased by almost 8 times over the traditional method. The proposed ChG aspheric lens fabrication process maintains high precision even under mass production conditions.

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Funding

This work was financially supported by National Natural Science Foundation of China (Nos. 51775046, 51875043, 52005040), the China Postdoctoral Science Foundation (No. 2019M660480), and the Bei**g Municipal Natural Science Foundation (JQ20014).

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Correspondence to Tianfeng Zhou.

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Zhou, T., Zhang, C., He, Y. et al. Aspheric lens processing of chalcogenide glass via combined PGM-SPDT process. Int J Adv Manuf Technol 120, 5855–5864 (2022). https://doi.org/10.1007/s00170-022-09112-4

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  • DOI: https://doi.org/10.1007/s00170-022-09112-4

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