Zhengping Wang

Shandong University, Chi-nan-shih, Shandong Sheng, China

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Publications (150)369.33 Total impact

  • Dongsheng Yuan · Yang Li · Jun Shu · Zeliang Gao · Zhitai Jia · Zhengping Wang · Xutang Tao ·
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    ABSTRACT: Towards the spatial optimum phase matching (PM) crystal device through a novel way, the micro-pulling-down (μ-PD) technique was used for crystal growth along second-order harmonic generation (SHG) direction for the first time to the best of our knowledge. In this paper, the spatial distribution of |deff| for a potential nonlinear optical (NLO) crystal TbCa4O(BO3)3 (TbCOB) at 1064 nm was calculated and analyzed firstly, and the PM angle (113°, 46°) was found to possess the largest deff value (type-I) being on the order of 1.39 pm/V. Along the optimum SHG direction, a rod-shape TbCOB crystal with 3 mm in diameter was successfully grown by using the μ-PD method. After simple cutting and polishing of the ends for μ-PD grown crystal, a high SHG efficiency (single-pass light reached up to 57%) was realized through a Nd:YAG pico-second laser at 1064 nm, which was comparable to that of crystal samples from Czochralski (Cz) growth. TbCOB crystals also exhibit a high laser damage threshold of >15 GW/cm2.
    Journal of Crystal Growth 12/2015; DOI:10.1016/j.jcrysgro.2015.10.003 · 1.70 Impact Factor
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    ABSTRACT: The self-frequency-doubling (SFD) lasers in visible region are of importance for optical applications. In this work, SFD green laser was realized on newly designed nonlinear optical crystal Nd doped Ca3TaGa3Si2O14 (Nd:CTGS). By optimizing the configurations, measuring the refractive indexes and coating the surfaces of Nd:CTGS crystal samples, the SFD green laser output at 533 nm was observed, and the maximum output power for type I (38.7°, 30.0°) crystal cut was obtained and found to be on the order of 71.58 mW. Meanwhile, the Nd:CTGS type I (38.7°, 30.0°) crystal cut was found to show low output threshold, being on the order of 0.52 W. The output power stability within 30 mins was observed to be better than 1%.
    Journal of Alloys and Compounds 12/2015; 651:475-478. DOI:10.1016/j.jallcom.2015.08.083 · 3.00 Impact Factor
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    Gang Zhao · Fang Zhang · Yongzhong Wu · Xiaopeng Hao · Zhengping Wang · Xinguang Xu ·
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    ABSTRACT: Hexagonal boron nitride (h-BN) nanosheets are attracting increased attention because of their excellent optical properties. Inspired by the natural exfoliation of seaside rocks, we propose a “chemical weathering” concept for fabricating h-BN nanosheets from their bulk counterparts. We experimentally demonstrate that chemical weathering-assisted exfoliation is a simple and efficient method for preparing h-BN nanosheets. These nanolayers have a high solubility in water because of the hydroxylation of h-BN (OH-BNNS). Interestingly, the as-prepared OH-BNNSs exhibit excellent optical limiting properties with fascinating two-photon absorption. It is a new and advanced optical material in the application of sensitive optical components, and shield human eyes from laser-induced damage.
    Advanced Optical Materials 10/2015; DOI:10.1002/adom.201500415 · 4.06 Impact Factor
  • Lisong Zhang · Fang Zhang · Mingxia Xu · Zhengping Wang · Xun Sun ·
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    ABSTRACT: Noncritical phase matching (NCPM) fourth-harmonic-generation (FHG) experiments were conducted on different deuterium content DKDP crystals by adjusting crystal temperature to generate 266 nm deep UV laser. Specially, near room temperature NCPM is realized in extremely high deuterium content DKDP crystal at 38.6 °C, which is the lowest temperature to the best of our knowledge. NCPM temperature of DKDP crystals in 60-100% deuterium content range and 1050-1070 nm wavelength range are determined by a linear relationship according to the experimental and calculated results. Angular tuning properties are independent with deuterium content in medium and higher deuterium content DKDP crystals. All of these results will provide good references for future FHG applications of 1 μm laser with DKDP crystals.
    Optics Express 09/2015; 23(18):23401-23413. · 3.49 Impact Factor
  • Lisong Zhang · Fang Zhang · Mingxia Xu · Zhengping Wang · Xun Sun ·

    Optics Express 09/2015; 23(18):23401. DOI:10.1364/OE.23.023401 · 3.49 Impact Factor
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    Gang Zhao · Shuo Han · Aizhu Wang · Yongzhu Wu · Zhengping Wang · Mingwen Zhao · Xiaopeng Hao ·

  • Lisong Zhang · Fang Zhang · Mingxia Xu · Zhengping Wang · Xun Sun ·
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    ABSTRACT: A high quality, large size (100 × 105 × 96 mm3) deuterated potassium dihydrogen phosphate (DKDP) crystal with high deuterium content was successfully grown by the rapid growth method. A noncritical phase matching (NCPM) fourth-harmonic-generation (FHG) of Nd:YAG laser (1064 nm) was realized at 39.7°C or so. The smallest full width at half maximum (FWHM) of angular acceptance for the longest crystal sample (20 mm) is 33.5 mrad, which is 10 times larger than the value of critically PM of a KDP crystal. The FHG conversion efficiency increases with the crystal length and reaches 64% for the 20 mm long crystal. As we have known, this is the highest FHG conversion efficiency of a 1064 nm laser with a repetition rate of 10 Hz in low drive conditions.
    RSC Advances 08/2015; 5(91). DOI:10.1039/C5RA14772G · 3.84 Impact Factor
  • Yanqing Liu · Fang Zhang · Zhengping Wang · Fapeng Yu · lei wei · Xinguang Xu · Xian Zhao ·
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    ABSTRACT: A borate crystal, Ca3(BO3)2, is reported for stimulated Raman scattering (SRS) from deep ultraviolet to near infrared. This crystal was found to possess a strong Raman response, and an outstanding anti-optical damage threshold as well as being easy to grow and having a low production cost. The short ultraviolet cut-off wavelength of 180 nm makes it available for deep ultraviolet or even vacuum ultraviolet SRS. This journal is
    Journal of Materials Chemistry C 08/2015; 3(41). DOI:10.1039/C5TC02067K · 4.70 Impact Factor
  • Baoan Liu · Shaotao Sun · Bo Wang · Xun Sun · Zhengping Wang · Xinguang Xu ·
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    ABSTRACT: A series of deuterated potassium dihydrogen phosphate (DKDP) crystals with different degrees of deuteration are grown from aqueous solution by the point-seed technique. The microhardness of (100), (001) and so-called ‘tripler’ faces for these DKDP crystals were measured. Initially the hardness number of (001) face for each crystal increases with the increase of the applied load until it reaches 25 g. With further increase in load, the hardness number decreases gradually. The hardness numbers decline with the increase in deuterium content. These composition dependences are expected since the bond strength is weakened by the substitution of deuterium for hydrogen. The hydrogen bond is considered to play the key role in effecting the crystal’s hardness. The visible hardness anisotropy of the different faces is attributed to the inhomogeneous distribution of the oxygen–hydrogen bond on these faces.
    Bulletin of Materials Science 08/2015; 38(4):1049–1053. DOI:10.1007/s12034-015-0858-3 · 1.02 Impact Factor
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    ABSTRACT: For the first time, graphene saturable absorber (SA) is used as the Q-switcher for a 946 nm Nd:YAG laser. Using a 5-7 layer graphene SA with initial transmission of 78% and an output coupler with transmission of 5%, efficient Q-switching operation is realized. When the absorbed pump power is raised to 9.5 W, a maximum output power of 0.9 W is obtained, corresponding to an optical conversion efficiency of 9.5%. The pulse repetition frequency and the pulse width are 225 kHz, 162 ns, respectively, resulting a pulse energy of 4 μJ and a peak power of 24.7 W. With a BiB3O6 (BIBO) crystal as the frequency doubler, 473 nm blue laser is generated. The present research manifests graphene has great potential for short wavelength laser modulation.
    Optik - International Journal for Light and Electron Optics 07/2015; 126(21). DOI:10.1016/j.ijleo.2015.07.092 · 0.68 Impact Factor
  • Yanqing Liu · Fapeng Yu · Zhengping Wang · Xinguang Xu · Xian Zhao ·
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    ABSTRACT: High optical quality La0.09Gd0.91Ca4O(BO3)3 and Nd0.03La0.08Gd0.89Ca4O(BO3)3 crystals, grown by Czochralski (Cz) pulling method, were investigated for their nonlinear optical (NLO) and laser properties. These crystals were found to possess moderate birefringence (0.0320 at 1064 nm), wide transparency (320 ∼ 2300 nm) and large effective nonlinear effects (deff ∼1.2 pm/V), which were suitable for green laser generation. The second-harmonic-generation (SHG) phase matching (PM) properties, including PM curve, deff, angular acceptance and walk-off angle were investigated. Both of the calculations and experiments have indicated that the 1064 nm optimum PM direction which has maximum deff (∼1.2 pm/V) and SHG conversion efficiency (57.1%) locate in the second octant, i.e. (113.5o, 48.6o). Pumped by the 0.8 μm AlGaAs laser diodes (LD), the self-frequency-doubling (SFD) performance of Nd0.03La0.08Gd0.89Ca4O(BO3)3 crystal was evaluated, where as much as 115 mW green light at 546 nm was obtained with a (113o, 48.9o)-cut, 6 mm long and uncoated Nd0.03La0.08Gd0.89Ca4O(BO3)3 sample.
    Journal of Alloys and Compounds 06/2015; 646. DOI:10.1016/j.jallcom.2015.05.165 · 3.00 Impact Factor
  • Fang Zhang · Shuo Han · Yanqing Liu · Zhengping Wang · Xinguang Xu ·
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    ABSTRACT: Using an optical parametric oscillation laser as the excitation source, the dependence of the saturable absorption of multiple-layer graphene upon photon energy is investigated and, in all cases, the saturation intensity is lower for lower excitation photon energy. This result experimentally proves the hourglass shape of the energy band of graphene, which is a well-known theoretical deduction from first principles. The modulation depth increases from 1.5% to 5.1% when the layer number increases from a monolayer to 5–7 layers and, at the same time, the saturation intensity decreases with increasing number of layers. The results demonstrate that, as a saturable absorber of a pulsed laser, graphene can more easily achieve optical modulation in the low energy region, i.e., the infrared waveband.
    Applied Physics Letters 03/2015; 106(9):091102. DOI:10.1063/1.4913607 · 3.30 Impact Factor
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    Yanqing Liu · Hongwei Qi · Qingming Lu · Fapeng Yu · Zhengping Wang · Xinguang Xu · Xian Zhao ·
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    ABSTRACT: As excellent nonlinear optical (NLO) crystals, YCa4O(BO3)3 (YCOB) and GdCa4O(BO3)3 (GdCOB) have been paid much attention since their first appearance in 1990’s. From that time to now, almost all of related researches and applications have focused on their type-I phase-matching (PM) configurations which possess large effective NLO coefficient (deff). In this paper, type-II second-harmonic-generation (SHG) properties of these two crystals are reported, including PM curve, deff, angular acceptance and walk-off angle. Both of the type-II SHG experiments for 1064 and 1320 nm have indicated that the optimum directions which have maximum deff locate in the second octant, i.e. (90° < θ< 180°, 0° < ϕ < 90°). For a (112°, 81.3°)-cut, 24 mm long YCOB crystal, the largest type-II SHG conversion efficiency of a 1064 nm Nd:YAG pico-second laser is 55%, which reaches the same level of the optimum type-I sample. To our knowledge this is the first time that type-II SHG performance of YCOB and GdCOB crystals is investigated intensively. Our research has shown that the smaller deff of type-II PM can be compensated by its larger angular acceptance and less beam walk-off. The same level SHG conversion efficiency implies for such type crystals the type-II components have the potential to replace type-I ones and obtain important NLO applications in the future.
    Optics Express 02/2015; 23(3). DOI:10.1364/OE.23.002163 · 3.49 Impact Factor
  • Shuo Han · Yanqing Liu · Fang Zhang · Ying Zhou · Zhengping Wang · Xinguang Xu ·
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    ABSTRACT: In this paper, a new method is used to direct generate Ince-Gaussian (IG) modes from a pulsed solid-state microchip laser. By moving a circular aperture horizontally, the gain size in the laser medium is adjusted, and different IG laser modes are obtained successively. The output laser possesses a stable pulse duration of 500-600 ps; at the same time, the repetition frequency varies between 7 and 16 kHz. To our knowledge, this is the first time that IG modes are obtained in the subnanosecond laser domain, which will be helpful for making large-energy high-peak-power devices.
    IEEE Photonics Journal 02/2015; 7(1):1-6. DOI:10.1109/JPHOT.2015.2396905 · 2.21 Impact Factor
  • Shuo Han · Yanqing Liu · Fang Zhang · Haohai Yu · Zhengping Wang · Qingtian Gu · Xinguang Xu ·
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    ABSTRACT: Sub-nanosecond passively Q-switched microchip lasers based on Nd:YVO4 and Cr4+:YAG were reported. On the whole, 2 at.% doped Nd:YVO4 crystals exhibited better performance than 3 at.% doped crystals. The shortest pulse duration of 693 ps was obtained from a-cut, 2 at.% doped Nd:YVO4, and the highest peak power of 32 kW, largest pulse energy of 29 μJ were produced by c-cut, 2 at.% doped sample. These experiment results illustrate that Nd:YVO4 and Cr4+:YAG are good combination for producing sub-nanosecond, high peak power microchip lasers.
    Infrared Physics & Technology 12/2014; 68(1). DOI:10.1016/j.infrared.2014.12.010 · 1.55 Impact Factor
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    ABSTRACT: The linear and nonlinear optical properties of TbCa4O(BO3)3 (abbreviated as TbCOB) single crystals were investigated for the first time. The refractive indices of TbCOB at several wavelengths were measured by using the minimum deviation method and the parameters of Sellmeier’s dispersion equation were determined from the experimental data. The complete set of six second-order nonlinear optical (NLO) coefficients of TbCOB single crystals were obtained using the Maker fringe (FM) technique, with the largest d32 being on the order of 1.65 pm/V. Moreover, the phase-matching (PM) configurations of second-order harmonic generation (SHG) in the principal planes were calculated, and the largest effective NLO coefficient is deff = 0.86 pm/V along (22.56°, 180°) PM direction. The SHG conversion efficiency from 1064 nm to 532 nm of 8 mm long crystal samples without AR coating along this direction was achieved 57.1% at 28.2 mW input power, and it has a small walk-off angle of 13.8 mrad. In addition, the comparison and discussion with GdCOB and YCOB were carried out.
    Optics Express 11/2014; 22(22). DOI:10.1364/OE.22.027606 · 3.49 Impact Factor
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    ABSTRACT: Sapphire, garnet and vanadate crystals are the most prominent optical materials, and vanadates play important roles in optics, especially in lasers and nonlinear optics. Neodymium-doped yttrium vanadate (Nd:YVO4) is representative and available commercially. Based on Nd:YVO4, several vanadate crystals are being developed with the goal of fulfilling the need for differential applications and improvement of certain operational aspects, such as with pulsed lasers or high-power continuous-wave lasers. In recent years, some important effects, including energy enhancement, bistability of output performance, self-Raman frequency shifting, etc., and some novel applications, such as quantum optics, pulsed lasers modulated by the two-dimensional crystals, etc., have been discovered with vanadates as gain materials. In this paper, the preparation, characterization and laser applications of vanadate laser crystals at the lasing wavelength of 1 micrometer, including YVO4, GdVO4, LuVO4, GdxY1–xVO4 and LuxGd1–xVO4 (0 < x < 1) doped with Nd3+ and ytterbium (Yb3+) are systematically reviewed by highlighting the most recent research progress. Their specific properties are presented, generation mechanisms of novel physical effects are discussed, new applications are given and possible future applications proposed by focusing on some potential strengths.
    Laser & Photonics Review 11/2014; 8(6). DOI:10.1002/lpor.201400022 · 8.01 Impact Factor
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    ABSTRACT: Crystal materials with integrated functionalities are desirable for the miniaturization of future optical devices. In this paper, nonlinear optical crystals of Ca3TaGa3Si2O14 (CTGS) and Nd3+ doped CTGS (Nd:CTGS) were grown using the Czochralski pulling method and explored for self-frequency-doubling applications. Based on the refractive indexes, the optimum phase matching directions for CTGS crystals were determined for type I (38.7°, 30.0°) and type II (61.1°, 0°) orientations, with respective effective nonlinear optical coefficients on the order of 0.44 pm V−1 and 0.34 pm V−1. Self-frequency-doubling was realized in Nd:CTGS crystals [(38.7°, 30.0°) (type I)] for the first time, and 18.8 mW laser power at 533 nm was achieved.
    CrystEngComm 10/2014; 16(44). DOI:10.1039/C4CE01740D · 4.03 Impact Factor
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    Yanqing Liu · Fapeng Yu · Zhengping Wang · Xinguang Xu · Xian Zhao ·
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    ABSTRACT: New nonlinear optical (NLO) crystals TmCa4O(BO3)3 (TmCOB) were grown by the Czochralski pulling method, and the anisotropy of second-harmonic-generation (SHG) properties were characterized. Based on the ratio of the peaks of the 2ω signals produced by TmCOB and that of KTP crystal samples at the low fundamental energy, the NLO tensor coefficients d12, d32, d31 and d13 were determined and found to be 0.24, 1.70, −0.55 and −0.32 pm/V, respectively. At 1064 nm, the phase-matching (PM) curves and the effective NLO coefficients (deff) in spatial distribution were evaluated. Efficient SHG was realized on a (32.5°, 180°)-cut TmCOB sample (4 × 4 × 11.8 mm3) in principal plane, by using a 1064 nm Nd:YAG pico-second laser, where the highest conversion efficiency of the single-pass light reached up to 51%, while for a (112.5°, 35.9°)-cut TmCOB sample (4 × 4 × 8 mm3) in spatial PM direction, the single-pass light reached 58%. Meanwhile, the angular noncritical phase matching (A-NCPM) wavelengths along the Y and Z principal axes were calculated and measured, and the limit of type-I PM wavelength of TmCOB was found to be 716 nm.
    Optical Materials Express 09/2014; 4(9). DOI:10.1364/OME.4.001787 · 2.84 Impact Factor
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    Yanqing Liu · Fapeng Yu · Zhengping Wang · Shuai Hou · Lei Yang · Xinguang Xu · Xian Zhao ·
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    ABSTRACT: New nonlinear optical (NLO) TmCa4O(BO3)3 (TmCOB) crystals were grown by the Czochralski method. X-ray powder diffraction results indicated that TmCOB crystals belong to the monoclinic system with space group Cm. The unit cell parameters were calculated to be a = 8.0679 Å, b = 16.0140 Å, c = 3.5224 Å, with α = γ = 90° and β = 101.1115°. Disorder distribution of Ca2+ and Tm3+ in TmCOB crystals was observed, from which the molecular formula was found to be (Tm0.78Ca0.22)(Ca3.78Tm0.22)O(BO3)3. The relationships between the crystallographic axes and the optical principal axes were determined, and the refractive indices at different wavelengths were measured, from which the phase matching angle at 1064 nm in the ZX principal plane was measured and found to be (32.5°, 180°) and (32.5°, 0°). Furthermore, efficient second harmonic generation in the ZX principal plane was realized by a 1064 nm Nd:YAG picosecond laser, where more than 50% conversion efficiency was achieved for the (32.5°, 180°)-cut sample (4 × 4 × 11.8 mm3), with the effective nonlinear optical coefficient and the acceptance angle determined to be on the order of 1.1 pm V−1 and 3.1 mrad cm, respectively.
    CrystEngComm 08/2014; 16(30):7141. DOI:10.1039/C4CE00869C · 4.03 Impact Factor

Publication Stats

2k Citations
369.33 Total Impact Points


  • 2000-2015
    • Shandong University
      • • State Key Laboratory for Crystal Materials
      • • School of Information Science and Engineering
      Chi-nan-shih, Shandong Sheng, China
  • 2004
    • Shenzhen University
      Bao'an, Guangdong, China