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Synthesis and growth of nonlinear infrared crystal material CdSe via seeded oriented temperature gradient solution zoning method
Youbao NI, Haixin WU, Mingsheng MAO, Chen LIN, Ganchao CHENG, Zhenyou WANG
Front Optoelec Chin. 2011, 4 (2): 141-145.
https://doi.org/10.1007/s12200-011-0158-5
Single crystals of CdSe were grown by using seeded oriented temperature gradient solution zoning (S-TGSZ) method with the sizes of 20 mm in diameter and 80 mm in length. The crystals were characterized with X-ray diffraction, transmission spectrophotometer and infrared microscope. The transmission spectra showed that the infrared transmission is above 65% and the mean absorption was 0.01–0.04 cm-1 in the range of 2.5–20 μm. With 2.797 μm Cr,Er:YSGG laser as pumping source, experiments of optical parametric oscillator (OPO) were performed by using fabricated 5 mm×5 mm×30 mm device crystal. The signal and idler wavelengths and the output average power were respectively 4.3 μm, 8 μm and 400 μJ. Optical-to-optical conversion efficiency was obtained by 12%.
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Room temperature synthesis of flower-like CuS nanostructures under assistance of ionic liquid
Chuyan CHEN, Qing LI, Yiying WANG, Yuan LI, Xiaolin ZHONG
Front Optoelec Chin. 2011, 4 (2): 150-155.
https://doi.org/10.1007/s12200-011-0167-4
Flower-like CuS nanostructures have been synthesized via a liquid precipitation route by the reaction between CuCl2·2H2O and thioacetamide (CH3CSNH2, TAA) in the ionic liquid 1-butyl-3-methyl imidazole six hexafluorophosphoric acid salts ([BMIM][PF6]) aqueous solution at room temperature. The products were characterized by X-ray powder diffraction (XRD), field emission scanning electronic microscopy (FESEM), Brunauer-Emmett-Teller (BET), Ultraviolet-Visible Spectrophotometer (UV-Vis) and Photoluminescence (PL) techniques. The as-prepared CuS nanostructures have a mean diameter of about 1 μm. A plausible mechanism was proposed to explain the formation of CuS nanostructures. The effects of experimental parameters on the formation of the products were also explored. With BET theory, it is found that the as-prepared CuS nanostructures have a specific area of 39 m2/g. The Barrett-Joyner-Halenda (BJH) pore size distribution of the as-prepared CuS nanostructures presents smaller pores centers about 60 nm. The UV-Vis and PL curves indicate that the as-prepared CuS nanostructures are promising candidates for the development of photoelectric devices.
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Synthesis and optoelectronic properties of silver-doped n-type CdS nanoribbons
Chunyan WU, Li WANG, Zihan ZHANG, Xiwei ZHANG, Qiang PENG, Jiajun CAI, Yongqiang YU, Huier GUO, Jiansheng JIE
Front Optoelec Chin. 2011, 4 (2): 161-165.
https://doi.org/10.1007/s12200-011-0153-x
Sliver doped n-type CdS nanoribbons (NRs) were successfully synthesized by using Ag2S as the dopant via a thermal co-evaporation method. The CdS:Ag NRs have wurtzite single-crystal structure with growth direction of [110]. Significantly, the conductivity of the CdS NRs increased ~6 orders of magnitude by silver doping. Moreover, the Ag doped CdS NRs showed much enhanced photoconductivity compared with the undoped ones, which will greatly favor the application of CdS nanostructures in high-performance nano-optoelectronic devices.
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Bis-(8-hydroxyquinoline) copper nanoribbons: preparation, characterization, and photoconductivity
Qi SHAO, Tao WANG, Xiuhua WANG, Youcun CHEN
Front Optoelec Chin. 2011, 4 (2): 195-198.
https://doi.org/10.1007/s12200-011-0164-7
Bis-(8-hydroxyquinoline) copper nanoribbons with an average width of 400 nm, a thickness of 70 nm and the length of up to tens of micrometers, were synthesized by a facile solvothermal method. X-ray powder diffraction and Fourier transform infrared spectrum were employed to determine their structure. The photoconductivity of a bundle of nanoribbons was also measured, which exhibited unique photoresponse to light, indicating their potential applications in photoswitch nanodevices in the future.
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Review of fiber Bragg grating sensor technology
Jinjie CHEN, Bo LIU, Hao ZHANG
Front Optoelec Chin. 2011, 4 (2): 204-212.
https://doi.org/10.1007/s12200-011-0130-4
The current status of the fiber Bragg grating (FBG) sensor technology was reviewed. Owing to their salient advantages, including immunity to electromagnetic interference, lightweight, compact size, high sensitivity, large operation bandwidth, and ideal multiplexing capability, FBG sensors have attracted considerable interest in the past three decades. Among these sensing physical quantities, temperature and strain are the most widely investigated ones. In this paper, the sensing principle of FBG sensors was briefly introduced first. Then, we reviewed the status of research and applications of FBG sensors. As very important for industrial applications, multiplexing and networking of FBG sensors had been introduced briefly. Moreover, as a key technology, the wavelength interrogation methods were also reviewed carefully. Finally, we analyzed the problems encountered in engineering applications and gave a general review on the development of interrogation methods of FBG sensor.
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Investigation of electrorheological fluid for optical finishing
Hui LI, Haobo CHENG, Yunpeng FENG, H. Y. TAM, Yongfu WEN
Front Optoelec Chin. 2011, 4 (2): 213-216.
https://doi.org/10.1007/s12200-011-0170-9
Electrorheological (ER) finishing is a promising technique for polishing optical mirrors lenses. Silicone oil-based ER finishing fluid with ceria particles as abrasive was developed, whose dispersed phase was alumina, titanium dioxide, silica, and starch, respectively. Experiments were performed in detail under the voltage of 3000 V, after 25 min of polishing a K9 glass. By using the ER fluid developed in this paper, with 47.62% starch, 47.62% silicone oil, and 4.76% ceria, the surface roughness of the K9 glass was reduced from 8.46 nm Ra to 3.45 nm Ra. The result verifies the validity of the developed ER fluid.
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19 articles
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