Cr掺杂YAG透明陶瓷的价态调控及光学性能研究

摘要/Abstract

摘要： Cr⁴⁺∶YAG晶体材料是一种理想的被动调Q材料。利用MgO、CaO作为价态平衡剂和烧结助剂,采用低温真空预烧结结合热等静压(HIP)烧结成功制备了高光学质量的0.25%Cr⁴⁺∶YAG(摩尔分数)透明陶瓷。探索了MgO、CaO及MgO-CaO双掺添加剂对Cr⁴⁺∶YAG陶瓷的透过率、吸收光谱和荧光性能的影响规律。研究发现,相较于CaO和MgO-CaO双掺添加剂,MgO在1 550 ℃低温真空预烧结时展现出了最好的Cr⁴⁺∶YAG助烧致密化作用。尤其当MgO添加的摩尔分数为0.25%时,陶瓷相对密度高达98%。在1 680 ℃ HIP烧结之后的Cr⁴⁺∶YAG陶瓷在1 400 nm处直线透过率达到了最高值84.4%。与此同时,在1 400 ℃退火处理20 h后,Cr⁴⁺∶YAG陶瓷尽管仍存在部分Cr³⁺,但在1 030 nm处Cr⁴⁺的吸收系数高达3.0 cm^-1。

关键词: Cr⁴⁺∶YAG陶瓷, 价态调控, 光学性能, 透明陶瓷, 烧结助剂

Abstract: Cr⁴⁺∶YAG crystal materials have been proved to be an ideal passive Q-switched material in recent years. Using MgO and CaO as sintering aid and charge compensation agent, 0.25%Cr⁴⁺∶YAG (molar concentration) transparent ceramics with high optical quality were successfully prepared by low-temperature vacuum sintering combined with hot isostatic pressing (HIP) sintering. Effect of MgO, CaO, and MgO-CaO co-added divalent oxides on the transmittance, absorption spectra, and fluorescent properties of Cr⁴⁺∶YAG ceramics were investigated. It is found that, compared with CaO and MgO-CaO series, MgO exhibits the most significant effect on the densification of Cr⁴⁺∶YAG ceramics when the vacuum-sintering temperature is 1 550 ℃. Especially when the molar concentration of MgO is 0.25%, the relative density reaches 98%. After HIP sintering at 1 680 ℃, the corresponding in-line transmittance of the densified Cr⁴⁺∶YAG ceramics reaches as high as 84.4% at the wavelength of 1 400 nm. Moreover, by annealing at 1 400 ℃ for 20 h, the absorption coefficient of Cr⁴⁺ at 1 030 nm reaches the highest value of 3.0 cm^-1, though some Cr³⁺ still remain in the Cr⁴⁺∶YAG ceramics.

Key words: Cr⁴⁺:YAG ceramics, valence regulation, optical property, transparent ceramics, sintering aid

中图分类号:

O734
O482.31

黄秋凤, 邓志强, 陈剑, 郭旺, 邓种华, 刘著光, 黄集权. Cr掺杂YAG透明陶瓷的价态调控及光学性能研究[J]. 人工晶体学报, 2024, 53(11): 1909-1917.

HUANG Qiufeng, DENG Zhiqiang, CHEN Jian, GUO Wang, DENG Zhonghua, LIU Zhuguang, HUANG Jiquan. Valence Regulation and Optical Properties of Cr-Doped YAG Transparent Ceramics[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(11): 1909-1917.

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