A novel infrared nonlinear optical crystal Ag4Ge3S7 and its preparation method

CN122105631APending Publication Date: 2026-05-29UNIV OF ELECTRONICS SCI & TECH OF CHINA
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Filing Date
2026-03-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The application of existing infrared nonlinear optical crystal materials such as AgGaS2, AgGaSe2 and ZnGeP2 in the infrared band is limited by problems such as low laser damage threshold, severe two-photon absorption and thermal expansion anisotropy, making it difficult to obtain large-size, high-quality crystals and thus limiting their practical applications.

Method used

A novel infrared nonlinear optical crystal, Ag4Ge3S7, was synthesized using a high-temperature solid-state reaction method. By constructing a Ge2+/Ge4+ mixed-valence state Ge–S functional framework and Ag–S coordination network, a stable non-centrosymmetric structure was formed, providing a stable local coordination environment and charge balance. The material exhibits good thermal and chemical stability.

Benefits of technology

Ag4Ge3S7 exhibits strong nonlinear effects under 2100nm laser irradiation, with a signal intensity 1.15 times that of AgGaS2. It also possesses good thermal and chemical stability, making it suitable for infrared laser frequency conversion applications.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122105631A_ABST
    Figure CN122105631A_ABST
Patent Text Reader

Abstract

The application relates to a novel infrared nonlinear optical crystal Ag4Ge3S7 and a preparation method thereof, and belongs to the field of inorganic materials. The Ag4Ge3S7 crystal has a non-centrosymmetric structure, belongs to a monoclinic system, a space group is Cc, a cell parameter is a=11.3613(3) angstrom, b=6.8380(2) angstrom, c=15.7941(4) angstrom, alpha=gamma=90 DEG, beta=93.032(2) DEG, a cell volume V=1225.30(6) angstrom 3 , and Z=4. The Ag4Ge3S7 crystal and a pure phase are prepared by a high-temperature solid-phase reaction method. Infrared nonlinear powder frequency doubling tests show that, under the irradiation of 2100nm laser as base frequency light, the Ag4Ge3S7 has strong nonlinear optical effect, and the signal strength is 1.15 times that of a classical infrared material AgGaS2; meanwhile, the Ag4Ge3S7 has a type of phase matching characteristics. The obtained infrared nonlinear optical crystal material Ag4Ge3S7 has potential application value in the field of infrared laser frequency conversion.
Need to check novelty before this filing date? Find Prior Art