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| 1 | Integrated lithium niobate single-mode lasers by the Vernier effect显示文摘Microcavity lasers based on erbium-doped lithium niobate on insulator(LNOI),which are key devices for LNOI integrated photonics,have attracted significant attention recently.In this study,we report the realization of a C-band single-mode laser using the Vernier effect in two coupled erbium-doped LNOI microrings with different radii under the pump of a 980-nm continuous laser.The laser,operating stably over a large range of pumping power,has a pump threshold of about 200μW and a side-mode suppression ratio exceeding 26 dB.The high-performance LNOI single-mode laser will promote the development of lithium niobate integrated photonics. | Ru Zhang Chen Yang ZhenZhong Hao Di Jia Qiang Luo DaHuai Zheng HongDe Liu XuanYi Yu Feng Gao Fang Bo YongFa Kong GuoQuan Zhang JingJun Xu | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，9： | 4 |
| 2 | Low threshold random lasing in dye-doped and strongly disordered chiral liquid crystals显示文摘Random lasing was experimentally investigated in pyrromethene 597-doped strongly disordered chiral liquid crystals (CLCs) composed of the nematic liquid crystal SLC1717 and the chiral agent CB15. The concentration of the chiral agent tuned the bandgap, and disordered CLC microdomains were achieved by fast quenching of the mixture from the isotropic to the cholesteric phase. Random lasing and band edge lasing were observed synchronously, and their behavior changed with the spectral location of the bandgap. The emission band for band edge lasing shifted with the change of the bandgap, while the emission band for random lasing remained practically constant. The results show that the threshold for random lasing sharply decreases if the CLC selective reflection band overlaps with the fluorescence peak of the dye molecules and if the band edge coincides at the same time with the excitation wavelength. | SHAOHUA GAO JIAYI WANG WENHUA LI XUANYI YU XINZHENG ZHANG XIAO SONG ANDREY ILJIN IRENA DREVENSEK-OLENIK ROMANO A.RUPP JINGJUN XU | 2020 | Photonics Research2020，8，5： | 2 |
| 3 | Wavelength dependence of light propagation in a water suspension of anisotropic scatterers显示文摘We experimentally study the wavelength dependence of light propagation in a water suspension of lithium niobate microcrystalline particles.First,the ballistic transmission in the visible range of the suspension is measured.The nonlinear relationship is observed between the transport mean free path and the wavelength of the incident light.Secondly,we measure the coherent backscattering (CBS) of the sample at different wavelengths.The full width at half maximum of the CBS cone at 532 nm is about 1.24 times as large as that at 671 nm.The results indicate that the light with a long wavelength propagates further than the short wavelength light and the localization state of the short one is stronger.Finally,we investigate the light-controllable CBS experiments in the disordered materials of anisotropic scatterers,which show that the configuration of pump light with the longer wavelength and the probe light with the shorter wavelength performs better. | SHI Fan ZHANG XinZheng LI Jun WANG PiDong XU Yan YU XuanYi XU JingJun | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，11： | 2 |
| 4 | Polarization-modified Fano line shape spectrum with a single whispering gallery mode显示文摘Using the HE11Xand HE11Ymodes in a tapered fiber(TF)and the whispering gallery mode(WGM)in a microsphere resonator,Fano line-shape spectra were theoretically described and experimentally observed in this study.The line shapes of the spectra can be tuned to form a Lorentz notch,various Fano line shapes,and the Lorentz peak by controlling the polarizations at the input and output ports of the TF.The relative position or the size of the waveguide and WGM resonator do not need to be accurately controlled to produce these effects.The proposed configuration is suitable for mass production and will improve the performance of the devices in which it is applied. | PengFa Chang BoTao Cao LiGang Huang JiWei Li Yue Hu Feng Gao WenDing Zhang Fang Bo XuanYi Yu GuoQuan Zhang JingJun Xu | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，1： | 1 |
| 5 | Diverse synthesis of the C ring fragment of bryostatins via Zn/Cu-promoted conjugate addition of α-hydroxy iodide with enone显示文摘A convergent approach to 1,5-hydroxy ketones,the general precursors for constructing the C ring of bryostatins,has been developed via a Zn/Cu-promoted conjugate addition of a-hydroxy iodides with enones.The reaction leads to direct formation of the C21-C22 bond and tolerates diverse functionalities at the C17-,C18-and C24-positions.The approach also enables a more concise synthesis of the known C ring intermediate(10 longest linear steps and 14 total steps),in contrast to its previous synthesis(17 longest linear steps and 22 total steps) in our total synthesis of bryostatin 8. | Zhiwen Chu Ruiqi Tong Yufan Yang Xuanyi Song Tian bao Hu Yu Fan Chen Zhao Lu Gao Zhenlei Song | 2021 | Chinese Chemical Letters2021，32，1： | 0 |
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