Zongju Xia

Peking University

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Yinghua Zou

Peking University First Hospital

Yinghua Zou

Peking University

Qihuang Gong

Peking University

Yu Zou

Sichuan University

ZOU YING-HUA

Wei Qian

Second Affiliated Hospital of Zhejiang University

Yujun Deng

Shanghai Jiao Tong University

Yuquan Shen

Technical Institute of Physics and Chemistry

Ping Yuan

Zhejiang University

Jifeng Shen

Jiangsu University

Cooperative Institutions

Peking University

Chinese Academy of Sciences

Fudan University

Beijing National Laboratory for Molecular Sciences

University of Chinese Academy of Sciences

Institute of Chemistry

Technical Institute of Physics and Chemistry

Sun Yat-sen University

Institute of Physics

University of Science and Technology of China

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Feasibility of Femtosecond Laser Writing Multi-Layered Bit Planes in Fused Silica for Three-Dimensional Optical Data Storage

Chinese Physics Letters (2001)

Chengde Li Danling Wang Le Luo Hong Yang Zongju Xia

The ultrashort pulse laser writing multi-layered data bits in fused silica for three-dimensional optical data storage through the mechanism of optical damage induced by multi-photon absorption is demonstrated. The 800 nm, 120 fs Ti:Sapphire laser beam is focused into cubic samples with a 0.65 NA commercial microscope objective. The size of the recorded bits can be smaller than 0.5×0.5×2.5 µm as the laser pulse energy is lower than 300 nJ and the corresponding bit data storage density is 0.2×1012 Tbits/cm3. Due to the aberration produced by the mismatch of the refractive indices between the recording material and its immersion medium, the longitudinal size of the recorded bit increases and the contrast of the bit to the surrounding uninfected zone decreases as the bit plane gets deeper. Hence, a relatively lower storage density of 0.05×1012 Tbits/cm3 is realized.

Optical storage

10.1088/0256-307x/18/4/325

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Citations (12)

THREE-WAVE DIFFERENCE-FREQUENCY GENERATION IN SODIUM VAPOR

Acta Physica Sinica (1989)

Zongju Xia ZOU YING-HUA

Electric quadrupole transition enhanced tthree-wave difference-frequency generation in isotropic medium is investigated. Taking account of the contribution of electric quadrupole interaction, we derive the second-order nonlinear susceptibility. We also discuss the possibility of observation of collision induced second-order nonlinear optical processes. The experiments are performed with 3s→4d electric quadrupole transition in sodium vapor. The experimental results agree with theoretical predictions.

10.7498/aps.38.24

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THE RELATIVE FERMI LEVEL POSITION AND THE ELECTRON-PHONON COUPLING OF YBa2Cu3Ｏ７－δ STUDIED BY FEMTOSECOND TRANSIENT REFLECTIVITY

Acta Physica Sinica (1994)

Guangcheng Xiong ZOU YING-HUA Zongju Xia Yuan Ping Guijun Lian

The femtosecond pulsed laser and pump-probe method have been used to measure the transient change of reflectivity of YBa2Cu3Ｏ７－δ(δ=0.0, 0.1, 0.4 and 0.8) thin films. From the experimental curves the transient changes are found to be very different for samples with different oxygen content. The sign of the changes can be reversed as decreasing the oxygen content. It may be attributed to the changes of energy band structure near the Fermi level. After fitting the experimental data, we reveal that the electron-phonon coupling in the sample of δ=0.4 is much weaker than high Tc(δ=0.0) sample.

Transient (computer programming)

10.7498/aps.43.1860

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Femtosecond Spectroscopy Studies on YBa₂Cu₃O_7-xand PrBa₂Cu₃O_7-xEpitaxial Thin Films

Chinese Physics Letters (1993)

Wensheng Zeng Lin Wei-Zhu Derui Zhu Feipeng Pi G. Xu

We report the results of femtosecond spectroscopy studies on YBa2Cu3O7-x (x=0.1, 0.4, 0.8) and PrBa2Cu3O7-x (x=0.1) epitaxial thin films at room temperature. The transient reflectivity signals ΔR(t) in the samples are consistent with a band filling model. The relaxation times of ΔR(t) in YBa2Cu3O7-x increase from less than 100 fs to more than 1 ps with increasing x and with substitution of Pr for Y. These results reveal that in high Tc superconductors decrease of carrier concentration slows down the carrier-phonon coupling.

10.1088/0256-307x/10/12/015

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Femtosecond Optical Kerr Effect of Surface Modified PbS Nanocrystals

Chinese Physics Letters (1998)

Xi‐Cheng Ai Rong Jin Jing Jing Wang Zongju Xia Yinghua Zou

Surface modified PbS nanocrystals were fabricated by a novel method and their ultrafast optical nonlinearity was studied by the femtosecond time-resolved optical Kerr effect. A large nonlinear effect (χ(3) similar 5 × 10-12 esu) with a laser pulse limited response was observed. This may be attributed to the reduction of surface trapped electrons due to the surface modification.

Femtosecond pulse

10.1088/0256-307x/15/3/014

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Citations (2)

Third-order optical nonlinearities of new two-dimensional pi -conjugated metal-coordinated complexes

Journal of Physics D Applied Physics (1994)

Qihuang Gong Yuan Wang Shaochen Yang Zongju Xia Yu Zou

We measured third-order nonlinear optical susceptibility for solutions of asymmetric tripyrrane-containing 22 pi -electron aromatic macrocyclic cadmium (Cd2+) and gadolinium (Gd3+) complexes in methanol at 1064 nm using degenerate four-wave mixing and obtained the off-resonant third-order hyperpolarizabilities as 1.2*10-31 and 1.0*10-31 esu, respectively.

Third order

10.1088/0022-3727/27/5/005

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Citations (17)

TUNABLE VACUUM-ULTRA VIOLET RADIATION GENERATED BY TWO-PHTON RESONANTFOUR-WAVE DIFFERENCE MIXING IN Hg VAPOR

Acta Physica Sinica (1990)

Huang Xian-ling Zongju Xia ZOU YING-HUA

Vacuum-ultra violet radiation is generated by 61S0-61D2 or 61S0-63D2 two photon resonant four-wave difference mixing (ω4=2ω1-ω3) in Hg vapor. VUV radiation is tunable when one of the input wave (ω3) is tuned, the tuning range is 184.9-187.5 nm. The mechanism of this frenquency conversion, for example, the two-photon and single-photon resonant enhancement and phase matching have been investigeted. The competing processes and saturation effect on conversion efficiency have been analyzed. Using the generated tunable VUV radiation, we have recorded the absorption spetrum of O2 in air.

Ultra violet

Four-wave mixing

Saturation (graph theory)

10.7498/aps.39.1385

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Langmuir-Blodgett film and nonlinear optical property of C60-glycine ester derivative

Chemical Physics Letters (1995)

Dejian Zhou Liangbing Gan Chuping Luo Haisong Tan Chunhui Huang

Derivative (finance)

10.1016/0009-2614(95)00097-n

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Citations (21)

Nonresonant third-order optical nonlinearity of all-carbon molecules C60

Journal of Applied Physics (1992)

Qihuang Gong Yuxing Sun Zongju Xia Yu Zou Zhennan Gu

The nonresonant third-order hyperpolarizability of all-carbon molecules C60 is measured by nanosecond degenerate four-wave-mixing experiment in C60 toluene solution. The value of γ1111 measured is 1.6×10−31 esu, which corresponds to an estimated value of the third-order nonlinear optical susceptibility χ(3)1111E = 3.3 × 10−9 esu for the solid compound.

Hyperpolarizability

Nanosecond

Four-wave mixing

Carbon fibers

Third order

10.1063/1.351391

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Citations (107)

Subpicosecond dynamics spectra in strained-layer and strained quantum well

Solid State Communications (1995)

Wei-xi Chen Yu-guang Hong Xiaozhong Dang Peng-fei Jiao Shumin Wang

10.1016/0038-1098(95)00508-0

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Citations (0)