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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2023, Vol. 42 ›› Issue (11): 4131-4135.

Special Issue: 玻璃

• Glass • Previous Articles     Next Articles

Fabrication and Properties of Infrared Gradient Refractive Index GeS2-In2S3-CsCl Chalcogenide Glass-Ceramics

LIU Hongjun1,2, LI Chengkang1,2, ZHOU Gangjie1,2, CHEN Jinjin1,2, LIN Changgui1,2   

  1. 1. The Research Institute of Advanced Technologies, Ningbo University, Ningbo 315211, China;
    2. Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo 315211, China
  • Received:2023-07-24 Revised:2023-08-22 Online:2023-11-15 Published:2023-11-22

Abstract: Gradient refractive index infrared imaging system can greatly reduce the size, weight and cost of system while maintaining imaging performance, which is expected to advance the development of infrared imaging system towards lightweight and compactness. However, currently available infrared gradient refractive index optical materials are not accessible. Based on 65GeS2-25In2S3-10CsCl chalcogenide glass, a gradient temperature field was used to thermally induce the precipitation of axially gradient-distributed β-In2S3 nanocrystals to produce a gradient refractive index transparent chalcogenide glass-ceramics. The results show that the precipitated β-In2S3 crystals are polycrystalline structures composed of nanocrystals with different crystallographic orientations, with a size of about 25 nm, and the size and number of crystals are closely related to gradient temperature field. The gradient refractive index chalcogenide glass-ceramics still maintain good transmission in long-wave infrared, and their maximum refractive index difference Δn reaches 0.047 at 10 μm.

Key words: chalcogenide glass, thermally induced crystallization, gradient refractive index, glass-ceramics, infrared transmission, optical material

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