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Next generation lanthanide doped nanoscintillators and photon converters

eLight 2022年第1期2卷 213-236页

作者： Lei Lei Yubin Wang andrey kuzmin Youjie Hua Jingtao Zhao Shiqing Xu Paras N.Prasad College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018ZhejiangChina Institute for Lasers Photonicsand Biophotonics and Department of ChemistryUniversity at BuffaloThe State University of New YorkBuffaloNY 14260USA

Scintillators are of significance for the realization of indirect X-ray detection and X-ray excited optical luminescence(XEOL)***,commercial bulk scintillators not only require complex fabrication procedures,but also exhibit non-tunable XEOL wavelength and poor device ***,thick crystals usually generate light scattering followed by evident signal crosstalk in a photodiode *** doped fluoride nanoscintillators(NSs)prepared with low-temperature wet-chemical method possess several advantages,such as low toxicity,cheap fabrication cost,convenient device processability and adjustable emission wavelengths from ultraviolet to visible and extending to second near infrared *** addition,they exhibit X-ray excited long persistent luminescence(XEPL)making them suitable for broadening the scope of their *** review discusses and summarizes the XEOL and XEPL characteristics of lanthanide doped fluoride *** discuss design strategies and nanostructures that allow manipulation of excitation dynamics in a core-shell geometry to simultaneously produce XEOL,XEPL,as well as photon upconversion and downshifting,enabling emission at multiple wavelengths with a varying time scale *** review ends with a discussion of the existing challenges for advancing this field,and presents our subjective insight into areas of further multidisciplinary opportunities.

关键词： lanthanide excited fluoride

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Hot-band absorption of indocyanine green for advanced anti-stokes fluorescence bioimaging

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Light(Science & Applications) 2021年第10期10卷 1877-1888页

作者： Jing Zhou Xiaoxiao Fan Di Wu Jie Liu Yuhuang Zhang Zikang Ye Dingwei Xue Mubin He Liang Zhu Zhe Feng andrey N.kuzmin Wen Liu Paras N.Prasad Jun Qian State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China Sir Run-Run Shaw Hospital School of MedicineZhejiang UniversityHangzhou 310016China Key Laboratory of Flexible Electronics(KLOFE)Institute of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing 211800China Department of Chemistry Zhejiang UniversityHangzhou 310058China Interdisciplinary Institute of Neuroscience and Technology(ZIINT) College of Biomedical Engineering and Instrument ScienceZhejiang UniversityHangzhou 310027China Institute for Lasers Photonicsand BiophotonicsDepartment of ChemistryUniversity at BuffaloState University of New YorkBuffaloNY 14260USA Key Laboratory of Optical Information Detection and Display Technology of Zhejiang Zhejiang Normal UniversityJinhua 321004China

Bright anti-Stokes fluorescence(ASF)in the first near-infrared spectral region(NIR-I,800 nm–900 nm)under the excitation of a 915 nm continuous wave(CW)laser,is observed in Indocyanine Green(ICG),a dye approved by the Food and Drug Administration for clinical *** dependence of fluorescence intensity on excitation light power and temperature,together with fluorescence lifetime measurement,establish this ASF to be originated from absorption from a thermally excited vibrational level(hot-band absorption),as shown in our experiments,which is stronger than the upconversion fluorescence from widely-used rare-earth ion doped *** test the utility of this ASF NIR-I probe for advanced bioimaging,we successively apply it for biothermal sensing,cerebral blood vessel tomography and blood stream ***,in combination with L1057 nanoparticles,which absorb the ASF of ICG and emit beyond 1100 nm,these two probes generate multi-mode images in two fluorescent channels under the excitation of a single 915 nm CW *** channel is used to monitor two overlapping organs,urinary system&blood vessel of a live mouse,while the other shows urinary system *** in intraoperative real-time monitoring,such multi-mode imaging method can be beneficial for visual guiding in anatomy of the urinary system to avoid any accidental injury to the surrounding blood vessels during surgery.

关键词： absorption excitation anatomy

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Suppressing small-scale self-focusing of high-power femtosecond pulses

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High Power Laser Science and Engineering 2023年第2期11卷 103-109页

作者： Mikhail Martyanov Vladislav Ginzburg Alexey Balakin Sergey Skobelev Dmitry Silin Anton Kochetkov Ivan Yakovlev Alexey kuzmin Sergey Mironov Ilya Shaikin Sergey Stukachev andrey Shaykin Efim Khazanov Alexander Litvak Institute of Applied Physics of the Russian Academy of Sciences Nizhny NovgorodRussia

It was shown experimentally that for a 65-fs 17-J pulse,the effect of filamentation instability,also known as small-scale self-focusing,is much weaker than that predicted by stationary and nonstationary theoretical models for high B-integral *** this discrepancy has been left unexplained at the moment,in practice no signs of filamentation may allow a breakthrough in nonlinear pulse post-compression at high laser energy.

关键词： B-integral cubic Kerr nonlinearity filamentation instability high-power femtosecond laser nonlinear post-compression

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eXawatt Center for Extreme Light Studies

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High Power Laser Science and Engineering 2023年第6期11卷 101-129页

作者： Efim Khazanov andrey Shaykin Igor Kostyukov Vladislav Ginzburg Ivan Mukhin Ivan Yakovlev Alexander Soloviev Ivan Kuznetsov Sergey Mironov Artem Korzhimanov Denis Bulanov Ilya Shaikin Anton Kochetkov Alexey kuzmin Mikhail Martyanov Vladimir Lozhkarev Mikhail Starodubtsev Alexander Litvak Alexander Sergeev Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences Nizhny Novgorod 603950Russia

The eXawatt Center for Extreme Light Studies project aimed to create a large scientific infrastructure based on lasers with giant peak *** project relies on the significant progress achieved in the last *** planned infrastructure will incorporate a unique light source with a pulse power of 600 PW using optical parametric chirped pulse amplification in large-aperture KD_(2)PO_(4),deuterated potassium dihydrogen phosphate *** interaction of such laser radiation with matter represents a completely new fundamental *** direct study of the space-time structure of vacuums and other unknown phenomena at the frontier of high-energy physics and the physics of superstrong fields will be *** applications will include the development of compact particle accelerators,the generation of ultrashort pulses of hard X-ray and gamma radiation for material science enabling one to probe material samples with unprecedented spatial and temporal resolution,the development of new radiation and particle sources,*** paper is translation from Russian[Kvantovaya Elektronika 53,95(2023)].

关键词： high-power femtosecond lasers interaction of ultrarelativistic field with matter

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Use of KDP crystal as a Kerr nonlinear medium for compressing PW laser pulses down to 10 fs

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High Power Laser Science and Engineering 2021年第4期9卷 86-92页

作者： andrey Shaykin Vladislav Ginzburg Ivan Yakovlev Anton Kochetkov Alexey kuzmin Sergey Mironov Ilya Shaikin Sergey Stukachev Vladimir Lozhkarev Artem Prokhorov Efim Khazanov Institute of Applied Physics of the Russian Academy of Sciences Nizhny Novgorod 603950Russia

The input pulse of the laser PEARL with energy of 18 J and pulse duration of about 60 fs was compressed to 10 fs after passage through a 4-mm-thick KDP crystal and reflection at two chirped mirrors with sum dispersion of-200 fs^(2).The experiments were performed for the B-integral values from 5 to 19 without visible damage to the optical elements,which indicates that small-scale self-focusing is not a significant *** was shown that,by virtue of the low dispersion of the group velocity,the KDP crystal has some advantages over silica:a larger pulse compression coefficient,especially at a small value of the B-integral(B=5,...,9),lower absolute values of chirped mirror dispersion,and also a possibility to control the magnitude of nonlinearity and dispersion by changing crystal orientation.

关键词： CafCA petawatt lasers post-compression self-phase modulation small-scale self-focusing thin film compression third-order nonlinearity

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