Qinghe Mao

University of Science and Technology of China

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John W. Y. Lit

Wilfrid Laurier University

Bo Yao

State Key Laboratory of Crystal Materials

Ye Liu

Dongguan University of Technology

Sujuan Feng

Qufu Normal University

Jie Cao

Beijing Institute of Technology

Qiao Lu

Nanjing University of Information Science and Technology

Li Wei

Wilfrid Laurier University

J. Ma

Beijing University of Posts and Telecommunications

Dian Duan

Wuhan National Laboratory for Optoelectronics

Qing Sun

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

University of Science and Technology of China

Anhui Institute of Optics and Fine Mechanics

Hefei National Center for Physical Sciences at Nanoscale

Hefei Institutes of Physical Science

University of Chinese Academy of Sciences

Huazhong University of Science and Technology

Southeast University

Shandong University

Wuhan National Laboratory for Optoelectronics

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Widely tunable L-band erbium-doped fiber laser with fiber Bragg gratings based on optical bistability

Applied Physics Letters (2003)

Qinghe Mao John W. Y. Lit

We propose and demonstrate a mechanism to widely tune L-band erbium-doped fiber lasers with ordinary commercial tunable fiber Bragg gratings. The function is based on the dual-wavelength bistability in linear overlapping laser cavities. The laser may be switched between two wavelengths located, respectively, in the short- and long-wavelength regions of the L-band by triggering the pump with a typical switching time of about 11 ms. The two wavelengths can be independently tuned to give the laser a total tuning range of 33 nm and an output dynamic range of 7 dB. Nearly constant output powers with high optical signal-to-noise ratios are achieved across the whole tuning range.

Fiber Bragg Grating

Bistability

Erbium

Optical Bistability

10.1063/1.1557321

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Citations (27)

Fabrication of γ-MnO2/α-MnO2 hollow core/shell structures and their application to water treatment

Journal of Materials Chemistry (2011)

Jie Cao Qinghe Mao Liang Shi Yitai Qian

In this work, we present a novel concept of structural design for the synthesis of a new type of core/shell structure comprising γ-MnO2 cores inside hollow α-MnO2 shells. The approach involves two main steps. First, MnCO3 microellipsoids were mixed directly with KMnO4 solution, which lead to a manganese oxide shell on the surface of the MnCO3. Then, thermal annealing of this type of core/shell structure resulted in the formation of γ-MnO2/α-MnO2 ellipsoids, accompanying with the phase transition in both the core and shell. The as-prepared γ-MnO2/α-MnO2 ellipsoids were used as adsorbent in water treatment, and showed an excellent ability to remove organic pollutants and heavy metal ions without any other additives.

Thermal Treatment

10.1039/c1jm10862j

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Citations (102)

Cladding-Pumped Erbium-Ytterbium Co-Doped Fiber Amplifier With Dual-Wavelength Auxiliary Signal Injection of 1030 and 1040 nm

IEEE photonics journal (2020)

Shanshan Wei Bo Yao Yujun Chen Qinghe Mao

We propose and demonstrate a cladding-pumped, erbium-ytterbium co-doped fiber amplifier (EYDFA) scheme based on dual wavelength auxiliary signal injection technique to solve the issue of the backward Yb-ASE self-lasing under strong pumping for the high-power fiber amplification of 1.5-μm kHz-linewidth linearly-polarized laser signal. With the dual wavelength auxiliary signal of 1030 and 1040 nm injection, the allowable maximum pump power without triggering the backward Yb-ASE self-lasing can be greatly increased due to the relieving effect on the inhomogeneous gain broadening. For an EYDFA with 3.8-m erbium-ytterbium co-doped double-clad fiber, the net output power is improved to 13.8 W, while the linewidth of the amplified single-transverse-mode linearly-polarized 1560 nm laser signal is still only 3.5 kHz. The SBS effect is observed to be trivial during the fiber amplification.

Laser linewidth

Ytterbium

Erbium

Amplified spontaneous emission

Cladding (metalworking)

Optical Pumping

10.1109/jphot.2020.2975843

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Citations (3)

Switchable multiwavelength erbium-doped fiber laser with cascaded fiber grating cavities

IEEE Photonics Technology Letters (2002)

Qinghe Mao John W. Y. Lit

We propose a new concept to produce switchable multiwavelength oscillations with a cascaded fiber Bragg grating overlapping cavity erbium-doped fiber laser. The laser can be designed to operate in multiwavelength or in wavelength switching modes. The different lines have different thresholds. For three-wavelength oscillation, the output powers are linear or piecewise linear functions of the input pump power. An output with a variation of only 1.5 dB has been achieved with an input pump power of 100 mW. For wavelength switching, three single-wavelength and two dual-wavelength operation regions have been obtained toy adjusting the input pump levels.

Fiber Bragg Grating

Erbium

10.1109/68.998701

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Citations (185)

Tapered Optical Fiber Probe Assembled with Plasmonic Nanostructures for Surface-Enhanced Raman Scattering Application

ACS Applied Materials & Interfaces (2015)

Zhulin Huang Lei Xing Ye Liu Zhiwei Wang Xiujuan Wang

Optical fiber-Raman devices integrated with plasmonic nanostructures have promising potentials for in situ probing remote liquid samples and biological samples. In this system, the fiber probe is required to simultaneously demonstrate stable surface enhanced Raman scattering (SERS) signals and high sensitivity toward the target species. Here we demonstrate a generic approach to integrate presynthesized plasmonic nanostructures with tapered fiber probes that are prepared by a dipping-etching method, through reversed electrostatic attraction between the silane couple agent modified silica fiber probe and the nanostructures. Using this approach, both negatively and positively charged plasmonic nanostructures with various morphologies (such as Au nanosphere, Ag nanocube, Au nanorod, Au@Ag core-shell nanorod) can be stably assembled on the tapered silica fiber probes. Attributed to the electrostatic force between the plasmonic units and the fiber surface, the nanostructures do not disperse in liquid samples easily, making the relative standard deviation of SERS signals as low as 2% in analyte solution. Importantly, the detection sensitivity of the system can be optimized by adjusting the cone angle (from 3.6° to 22°) and the morphology of nanostructures assembled on the fiber. Thus, the nanostructures-sensitized optical fiber-Raman probes show great potentials in the applications of SERS-based environmental detection of liquid samples.

10.1021/acsami.5b04202

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Citations (76)

Investigations of the fabrication and the surface-enhanced Raman scattering detection applications for tapered fiber probes prepared with the laser-induced chemical deposition method

Applied Optics (2013)

Qunfang Fan Jie Cao Ye Liu Bo Yao Qinghe Mao

The process of depositing nanoparticles onto tapered fiber probes with the laser-induced chemical deposition method (LICDM) and the surface-enhanced Raman scattering (SERS) detection performance of the prepared probes are experimentally investigated in this paper. Our results show that the nanoparticle-deposited tapered fiber probes prepared with the LICDM method depend strongly on the value of the cone angle. For small-angle tapered probes the nanoparticle-deposited areas are only focused at the taper tips, because the taper surfaces are mainly covered by a relatively low-intensity evanescent field. By lengthening the reaction time or increasing the induced power or solution concentration, it is still possible to deposit nanoparticles on small-angle tapers with the light-scattering effect. With 4-aminothiophenol as the testing molecule, it was found that for given preparation conditions, the cone angles for the tapered probes with the highest SERS spectral intensities for different excitation laser powers are almost the same. However, such an optimal cone angle is determined by the combined effects of both the localized surface plasmon resonance strength and the transmission loss generated by the nanoparticles deposited.

10.1364/ao.52.006163

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Citations (29)

An L-band widely tunable erbium-doped fiber laser with all-fiber structure

Laser Physics (2013)

Li Wei Li Liu Sujuan Feng Qinghe Mao

We report on a widely tunable L-band erbium-doped fiber ring laser with the exploitation of an all-fiber Lyot fiber. The all-fiber Lyot filter is constructed from a polarizer, a short section of polarization-maintaining fiber and polarization controllers. Theoretical analysis shows that the laser oscillating wavelength can be tuned by changing the polarization rotation angle. By adjusting the polarization controllers, the laser can be tuned continuously over the full L band (1559.84–1603.19 nm) with a tunability of 43 nm, a side-mode suppression ratio over 44 dB, and power uniformity better than 1.2 dB. The simple and efficient tuning mechanism allows the building of inexpensive widely tunable fiber lasers with all-fiber structure.

Polarizer

Erbium

10.1088/1054-660x/23/5/055102

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Citations (7)

Influences of gain broadening on multiwavelength oscillations in YDFLs and EDFLs

Optics Communications (2008)

Qinghe Mao Zongjiu Zhu Qing Sun Wenqing Liu John W. Y. Lit

Amplified spontaneous emission

10.1016/j.optcom.2008.02.018

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Citations (10)

All-optical logic gates based on two-dimensional low-refractive-index nonlinear photonic crystal slabs

Optics Express (2011)

Ye Liu Fei Qin Ziming Meng Fei Zhou Qinghe Mao

This article demonstrates theoretical design of ultracompact all-optical AND, NAND, OR, and NOR gates with two-dimensional nonlinear photonic crystal slabs. Compound Ag-polymer film with a low refractive index and large third-order nonlinearity is adopted as our nonlinear material and photonic crystal cavities with a relatively high quality factor of about 2000 is designed on this polymer slab. Numerical simulations show that all-optical logic gates with low pump-power in the order of tens of MW/cm2 can be achieved. These design results may provide very useful schemes and approaches for the realization of all-optical logic gates with low-cost, low-pump-power, high-contrast and ultrafast response-time.

NOR gate

10.1364/oe.19.001945

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Citations (162)

ChemInform Abstract: Synthesis of Mn₂O₃ Homogeneous Core/Hollow‐Shell Structures with Excellent Adsorption Performance.

ChemInform (2012)

Jie Cao Qinghe Mao Yitai Qian

Abstract Mn 2 O 3 homogeneous core/hollow‐shell structures with cube‐shaped and dumbbell‐shaped morphologies are synthesized in high yields from MnCO 3 microcubes (obtained from H 2 O/EtOH solutions of MnSO 4 , NaHCO 3 , and (NH 4 ) 2 SO 4 , 50 °C, 7 h) or MnCO 3 dumbbells (obtained from aqueous solutions of MnCl 2 , C 6 H 5 Na 3 O 7 , and NH 3 , autoclave,160 °C, 2 h).

Autoclave

10.1002/chin.201235018

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