Precise deuterium content measurement of K(HxD1−x)2PO4 crystals based on deep-UV generation

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2025-07-29 DOI:10.1039/D5CE00610D

Yiqun Shi, Zijian Cui, Junze Xu, Mingying Sun, Xiuqing Jiang, Li Yin, Xinglong Xie, De'an Liu and Jianqiang Zhu

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Abstract

Large-diameter K(H_xD_1−x)₂PO₄ (DKDP) crystals have been widely applied for optical parametric chirped pulse amplification and broadband UV generation in superintense ultrafast lasers and inertial confinement fusion facilities. Herein, we systematically investigated the noncritical phase-matching wavelength properties of KDP-family crystals at room temperature and demonstrated a precise characterization method for the deuterium contents of large-diameter DKDP crystals based on the ∼245 and ∼215 nm deep-UV sum-frequency generation (SFG). This SFG measurement method overcomes the low accuracy disadvantage of the Raman spectroscopy, especially for the DKDP crystals with deuterium contents of >90%. Full-range (0–100%) measurement with a precision of ∼0.148% cm was achieved, which is an enhancement of more than one order of magnitude over conventional spectroscopic schemes. This work not only has the potential to be a standard method for the deuterium content characterization of DKDP crystals, but also paves the way for energy improvement and applications of tunable deep-UV radiation by fully utilizing large-diameter characteristics of KDP-family crystals.

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基于深紫外生成的K(HxD1−x)2PO4晶体氘含量的精确测量

大直径K(HxD1−x)2PO4 （DKDP）晶体在超强超快激光器和惯性约束聚变装置中广泛应用于光参量啁啾脉冲放大和宽带紫外产生。在此，我们系统地研究了室温下kdp家族晶体的非临界相匹配波长特性，并展示了基于~ 245和~ 215 nm深紫外和频率生成（SFG）的大直径DKDP晶体氘含量的精确表征方法。这种SFG测量方法克服了拉曼光谱测量精度低的缺点，特别是对于氘含量为90%的DKDP晶体。实现了全量程（0-100%）测量，精度为~ 0.148% cm，比传统的光谱方案提高了一个数量级以上。这项工作不仅有潜力成为表征DKDP晶体氘含量的标准方法，而且充分利用kdp家族晶体的大直径特性，为能量改进和可调谐深紫外辐射的应用铺平了道路。

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