Uniform Alignment of Non-π-Conjugated Species Enhances Deep Ultraviolet Optical Nonlinearity
Uniform Alignment of Non-π-Conjugated Species Enhances Deep Ultraviolet Optical Nonlinearity
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非π共轭物质的均匀排列增强了深紫外光学非线性
DOI：
10.1021/jacs.9b03858
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发表时间：
2019-05-22
影响因子：
15
通讯作者：
Wu, Li-Ming
中科院分区：
文献类型：
--
作者：
Lu, Jing;Yue, Jia-Ning;Wu, Li-Ming
激光应用阵列的精度和较小尺度上的操纵受到所谓的200 nm壁的限制，突破依赖于发现在紫外和深紫外区域具有透明性和相位匹配性的新材料。在本文中，我们发现了NaNH 4PO 3F中心点H2O中不对称非π共轭物质[PO 3F]的前所未有的排列，这允许最佳均匀的P-F键取向，其产生了产生最大双折射率（obv.：0.053），迄今为止在磷酸盐和氟磷酸盐家族中。该物质通过在尺寸为14 x 10 x 2.1 mm（3）的合成（010）晶片上与入射Yb：KGW飞秒激光直接倍频产生二次谐波产生激光。根据计算的折射率色散曲线，最短的二次谐波产生（SHG）波长估计为194 nm，最短的磷酸盐和单氟磷酸盐。这些研究成果对设计其他高性能非π共轭深紫外非线性光学材料具有一定的指导意义。
The precision of array of laser applications and manipulation on smaller scales are limited by the so-called 200 nm wall, and breakthroughs rely on the discovery of new materials with transparency and phase matchability in the ultraviolet and deep ultraviolet region. Herein, we discover an unprecedented alignment of the asymmetric non-pi-conjugated species [PO3F] in NaNH4PO3F center dot H2O, which allows the best uniform P-F bond orientation that generates a remarkable enhancement of the (010) in-plane anisotropy that yields the largest birefringence (obv.: 0.053) to date in the phosphate and fluorophosphate families. The substance produces second harmonic generation lasers through direct frequency doubling with incident Yb:KGW femtosecond lasers on an as-synthesized (010) wafer with a size of 14 x 10 x 2.1 mm(3). According to the calculated refractive index dispersion curve, the shortest second-harmonic generation (SHG) wavelength is estimated to be 194 nm, the shortest among phosphates and monofluorophosphate. These insights may help to design other high-performance non-pi-conjugated deep-UV nonlinear optical materials.