Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province

Ningbo, China

Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province

Ningbo, China
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Zhao Z.,Ningbo University | Zhao Z.,Jiaxing University | Zhao Z.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Wu B.,Ningbo University | And 18 more authors.
Laser and Photonics Reviews | Year: 2017

A mid-infrared (MIR) supercontinuum (SC) has been demonstrated in a low-loss telluride glass fiber. The double-cladding fiber, fabricated using a novel extrusion method, exhibits excellent transmission at 8–14 μm: < 10 dB/m in the range of 8–13.5 μm and 6 dB/m at 11 μm. Launched intense ultrashort pulsed with a central wavelength of 7 μm, the step-index fiber generates a MIR SC spanning from ∼2.0 μm to 16 μm, for a 40-dB spectral flatness. This is a fresh experimental demonstration to reveal that telluride glass fiber can emit across the all MIR molecular fingerprint region, which is of key importance for applications such as diagnostics, gas sensing, and greenhouse CO2 detection. (Figure presented.). © 2017 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


Zhang Y.,Ningbo University | Zhang Y.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Xu Y.,Ningbo University | Xu Y.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | And 10 more authors.
Optics Express | Year: 2017

Chemical stoichiometric Ge-As-S glasses were prepared, and their thermal properties, refractive index (n), optical bandgap, Raman gain, and femtosecond laser damage were examined. Results revealed that the n and density (ρ) of the glasses decreased as Ge concentration increased, whereas the bandgap and glass transition temperature (Tg) increased. The Raman gain coefficients (gR) of the samples were calculated on the basis of spontaneous Raman scattering spectra. gR decreased from 2.79 × 10-11 m/W for As2S3 to 1.06 × 10-11 m/W for GeS2 as Ge concentration increased. However, the smallest gR was 100 times higher than that of fused silica (0.89 × 10-13 m/W). When these glasses were irradiated by a laser with a pulse width of 150 fs and a power of 33 mW at 3 μm, the damaged area and depth decreased and the damage threshold increased gradually as Ge concentration increased. Raman spectra and composition analysis indicated that surface oxidation probably occurred and sulfur gasified at a high laser power. Although the gR decreased as Ge was added, the laser damage threshold of Ge-As-S glasses was higher than that of the As2S3 glass. Thus, these glasses are potential materials for Raman gain media. © 2017 Optical Society of America.


Wu X.,Ningbo University | Li X.,Ningbo University | Li X.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Zhu C.,Ningbo University | And 4 more authors.
Materials Today Energy | Year: 2016

Ultralong BaLi2Ti6O14 nanofibers constructed from attached nanoparticles, as be an excellent candidate of long cycle life and good rate capability anode material of lithium-ion batteries for future applications in portable electronics, electric vehicles and grid storage, are prepared through electrospinning and subsequent annealing. The obtained materials are characterized by powder X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, cyclic voltammetry and in situ X-ray diffraction. The unique one-dimensional nanomaterials used as an anode of lithium-ion batteries exhibit superior electrochemical performances: (i) excellent rate behavior (The charge capacities are 133.7, 127.2, 122.5, 119.1, 116.0 and 113.8 mAh g−1 at 100, 200, 300, 400, 500 and 600 mA g−1 separately); (ii) outstanding cycle performance (When the nanomaterials are cycled at 200, 500 and 1000 mA g−1 respectively, the initial charge capacities of 138.2, 137.3 and 140.2 mAh g−1 fade with the corresponding average rate of 0.528‰, 0.197‰ and 0.153‰ per cycle until the 200th, 400th and 800th cycles). The results above reveal the great potential of the BaLi2Ti6O14 nanofibers as a practical anode for high performance lithium ion batteries. © 2016 Elsevier Ltd


Yang Z.,Ningbo University | Yang Z.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Wu Y.,Ningbo University | Wu Y.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | And 8 more authors.
IEEE Photonics Technology Letters | Year: 2017

We report microsphere resonators fabricated with a gallium germanium antimony sulfide (2S2G) chalcogenide glass and demonstrate whispering gallery modes (WGMs) in the wavelength range of 1.65-2μm. Typical quality factors (Q factors) measured with 2S2G microspheres fabricated in our lab are approximately 6× 104. Compared with other chalcogenide glasses used in microsphere resonators, this 2S2G glass has a lower melting temperature and a higher characteristic temperature, and therefore, the fabrication temperature in the sphere-forming process can be reduced and the crystallization problem can be mitigated. We also demonstrate apparent shifts of resonant peaks in the measured WGMs as the environmental temperature varies, implying that these 2S2G microspheres can be used as compact temperature sensors. The thermal sensitivity measured with a 108.52-μm-diameter 2S2G microsphere is 28 pm/°C. © 1989-2012 IEEE.


Ou H.,Ningbo University | Ou H.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Dai S.,Ningbo University | Dai S.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | And 15 more authors.
Optics Letters | Year: 2016

We report the fabrication of a novel high nonlinear fiber made of Ge-Sb-Se chalcogenide glasses with high numerical aperture (∼1.0), where the core and the cladding glasses consist of Ge15Sb25Se60 and Ge15Sb20Se65 (mol. %), respectively. The nonlinear refractive index (n2) of the core glass is 19 × 10-18 m2/W at 1.55 μm, and its laser-induced damage threshold under irradiation of 3.0 μm fs laser is approximately 3674 GW/cm2. By pumping a 20-cm-long fiber with a core diameter of 23 μm using 150 fs pulses at 6.0 μm, supercontinuum spanning from ∼1.8 to ∼14 μm was generated. © 2016 Optical Society of America.


Zhang P.,Ningbo University | Zhang P.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Yang P.,Ningbo University | Yang P.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | And 7 more authors.
Optics Express | Year: 2016

In this study, the supercontinuum (SC) generation in a 1-m-long As2S3 fiber with a 200 μm core diameter was demonstrated experimentally. The high-purity As2S3 fiber we used exhibited very low optical loss with a background loss of approximately 0.1 dB/m at a wavelength of 2-5 μm. SC generation was studied by pumping the fiber at different wavelengths and different peak powers. A strong spectral broadening with a 30 dB spectral flatness spanning from 1.4 to 7.0 μm was obtained when the fiber was pumped with 150 fs short pulses at 5.0 μm. The SC generation in bent fiber was also studied. The result showed that the bending radius of the fiber will significantly affect the SC spectra bandwidth and the output power. The SC spectra in the used fiber could still be maintained when it was bent to a radius of 5 cm. © 2016 Optical Society of America.


Li X.,Ningbo University | Li X.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Chen J.,Shanghai JiaoTong University | Dai S.,Ningbo University | Dai S.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province
Optik | Year: 2016

We demonstrate a stable multiwavelength passively mode-locked erbium-doped fiber laser with ultra-narrow wavelength spacing and ultra-broad bandwidth. It is realized by exploiting an intracavity birefringence-induced comb filter and inhomogeneous loss mechanism based on nonlinear polarization rotation. Stable 808-line wavelength lasing with wavelength spacing of 0.07 nm and 3-dB bandwidth of 55.75 nm is achieved at room temperature. If 5-dB bandwidth of 86.15 nm is considered, the number of the lasing lines reaches 1248. In addition, the lasing wavelength lines and spacing could be flexibly tuned by modifying polarization-dependent cavity loss via properly rotating the waveplates. © 2016 Elsevier GmbH


Wang G.,Ningbo University | Wang G.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Shen X.,Ningbo University | Shen X.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | And 8 more authors.
Thin Solid Films | Year: 2016

The structural stability of carbon (C) incorporated Sb2Te films was investigated during crystallization process. Variations in the transition temperature for the as-deposited films during crystallization show that these films exhibit their enhanced amorphous stability due to C incorporation, while more C content will lead to a difference in the degree of disorder in the crystalline state. XPS data reveals that C atoms do not bond with Sb and Te atoms and only present in the form of [Formula presented] bonds. According to XRD and TEM results, C atoms presents amorphous and this can increase the degree of disorder in the crystalline films. The Sb2Te nanocrystals were surrounded by an amorphous C phase. A subsequent Raman analysis further provides the direct evidence of improvement in the degree of disorder in the crystalline state. The laser-induced crystallization process of C37.4(Sb2Te)62.6 reveals that the degree of disorder in the crystalline state is relatively high and the reliability during the repetitive laser melt-quenching cycles is confirmed with fast crystallization as well as a low melting point of only 353 °C. Increasing degree of disorder in the Sb2Te films by C addition can improve the phase-change behavior and make this film suitable for data storage applications. © 2016 Elsevier B.V.


Li G.,Ningbo University | Xu T.,Ningbo University | Xu T.,Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province | Dai S.,Ningbo University | And 5 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2016

Series of GaxSb40-xS60 chalcogenide glasses were synthesized by a melt-quenching method. The thermal and optical properties of sample glasses were determined by the Archimedes principle, X-ray diffraction, thermal expansion, ultra violet-visible-near infrared absorption spectroscopy, and Fourier transform infrared spectroscopy, respectively. The structures of the samples with different compositions were analyzed by Raman spectroscopy. The results show that all of the glasses have good thermal stability and spectral properties. The density decreases slightly, the glass transition temperature improves, and the thermal expansion coefficient reduces with increasing the content of gallium. Besides, there is a slightly augmentation of optic band gap and a regularly blue-shifted of IR absorption cutting-off edge. Since all of the chalcogenide glasses have a high transmittance in a wide spectrum range of 0.8-14.0 μm (covering three main commutation bands and thermal infrared band), they are thus a promising material for mid-infrared application. According to the Raman spectra, the formation of [GaS4] tetrahedral units promote and the [SbS3] pyramid units suppress with the increase of gallium content. The relationship between optical properties and the structure in the chalcogenide glasses was summarized. © 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

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