Derui Zhu

Sun Yat-sen University

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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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Optical phase conjugation in undoped and doped KNSBN

Conference on Lasers and Electro-Optics (1989)

Rong Zhu Wenji Peng Weilong She Qinxing Li Zhenxin Yu

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Optical properties of lead lanthanum zirconate titanate amorphous thin films

Thin Solid Films (1998)

Derui Zhu Qiujun Li Tianshu Lai Dang Mo Yuhuan Xu

Lead zirconate titanate

Lanthanum

Lead titanate

Lead (geology)

10.1016/s0040-6090(97)00819-5

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Citations (19)

Ellipsometric spectra and optical constants of PLZT thin films

Ferroelectrics (1999)

Dang Mo Qiujun Li Derui Zhu Huiqiu Li Yueli Zhang

Abstract Lead lanthanum zirconate titanate (PLZT) amorphous films with composition 9/65/35 were prepared by the sol-gel technique. The ellipsometric spectra of the PLZT films on Si substrates were measured in the wavelength range of 200–700nm. By analyzing the ellipsometric spectra, the optical constant (refractive index n and extinction coefficient k) spectra of the PLZT amorphous films were obtained. We also measured the ellipsometric spectra of PLZT ceramics with the same composition and compared the results of the amorphous films with those of the ceramics. In comparison with the ceramics, the absorption edge of the PLZT imorphous films was found to be at a shorter wavelength. Key Words: ellipsometryferroelectric filmsoptical constants

Optical spectra

10.1080/00150199908224328

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Photorefractive properties and phase-conjugation of doped KNSBN crystals

Ferroelectrics (1997)

Dang Mo Yueli Zhang Derui Zhu Xiangshou Xie Ren Wang

Abstract Doped KNSBN single crystals were prepared by the Czochralski technique. The two-wave coupling experiments were performed and the gain coefficients as functions of the crossing angle of two beams in various samples were obtained. The experimental result was compared with the theoretical analysis. In addition, the intensity-dependent gain coefficient of two-wave coupling was measured and analyzed. Some results of self-pumped phase-conjugate reflectivities of doped KNSBN samples are given. Using the 50-75ps pulses, we have successfully observed the transient two-wave coupling and the time-reverse of the phase-conjugation.

Potassium niobate

Phase conjugation

Transient (computer programming)

Conjugate

Intensity

10.1080/00150199708224130

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Temporal responses of optical phase conjugation in the undoped KNSBN crystal

Conference on Lasers and Electro-Optics (1989)

Wenji Peng Rong Zhu Weilong She Qinxing Li Zhenxin Yu

Recently it was found that photorefractive materials are some of the most sensitive materials for performing optical phase conjugation and digital optical computing1 by using only a few milliwatts of continuous laser power.1 The photorefractive crystal KNSBN [(K0.5Na0.5)0.4(Sr0.61Ba0.39)0.8(Nb6O2],2 compared to BaTiO3,1 has the same or higher optical sensitivity and can be grown more easily to produce doped and undoped crystals of adequate size and optical quality for numerous applications. We report the experimental results on the temporal responses of the optical phase conjugation and the natural decay time of the phase grating of the photorefractive crystal KNSBN. These may play important roles in digital optical computing and optical message storage, respectively.

Crystal (programming language)

Phase conjugation

Optical storage

Source

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Photorefractive effects in KNSBN crystals

Ferroelectrics (1989)

Yuhuan Xu Zhuili Huang W. L. Li Hao Wang Derui Zhu

Abstract The ferroelectric single crystal series (K x Na1-x )0.4(Sr y Ba1-y )0.8Nb2O6 where 0.30 ≪ x ≪ 0.75 and 0.30 ≪ y ≪ 0.90 (to be abbreviated to KNSBN) with tetragonal tungsten-bronze type structure have been developed and studied by Xu, et al. 1–7 The experiment for photorefractive effect has been performed in undoped and doped KNSBN crystals. The crystal sample was exposed by a beam of light (578 nm) from a tunable dye laser, while the photoinduced birefringence change was determined. As an example, the experimental results in Nd-KNSBN are shown.

Tetragonal crystal system

Potassium niobate

Crystal (programming language)

Strontium barium niobate

Antiferroelectricity

10.1080/00150198908211328

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Spectroellipsometric Study of Lead Lanthanum Zirconate Titanate Amorphous Ferroelectric-Like Thin Films

Chinese Physics Letters (1998)

Qiujun Li Derui Zhu Dang Mo Yuhuan Xu J. D. Mackenzie

Lead lanthanum zirconate titanate (PLZT) amorphous thin films whose composition is stoichiometric 9/65/35 have been grown and they show some wonderful ferroelectric-like properties. The ellipsometric spectra of the PLZT ferroelectric-like amorphous films have been obtained by a homemade automatic ellipsometer in the wavelength range of 200-700 nm, and their optical constant (refractive index n and extinction coefficient k) spectra have been determined. As the photon energy changes from 1.9 to 5.8 eV, the refractive index n of the PLZT amorphous films increases from 2.13 to 2.46, then decreases to 1.45. The absorption edge of the PLZT amorphous films is about 300 nm, while that of the transparent ceramics with the same composition is about 377 nm.

Lead zirconate titanate

Lead titanate

Lanthanum

Ellipsometry

Absorption edge

10.1088/0256-307x/15/8/020

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Citations (1)