The fabrication of one kind of large core area Nd3 + doped silicate glass photonic crystal fiber, and demonstration of the fiber's waveguidence properties were reported. This fiber owns a random air hole distribut...The fabrication of one kind of large core area Nd3 + doped silicate glass photonic crystal fiber, and demonstration of the fiber's waveguidence properties were reported. This fiber owns a random air hole distribution in the cladding. The measured minimum loss of this kind of fiber is 10 dB·m-1 at 660 nm. These fibers can sustain only a single mode at least over wavelength ranging from 660 nm to 980 nm.展开更多
In this paper, we put emphasis on the analysis the mechanism of the photon induced frequency conversion β BaB 2O 4 crystal inside a borate glass using femtosecond laser. Because of the nature of femtosecond laser...In this paper, we put emphasis on the analysis the mechanism of the photon induced frequency conversion β BaB 2O 4 crystal inside a borate glass using femtosecond laser. Because of the nature of femtosecond laser's ultra short pulse duration and high energy density, in essence the laser glass interaction mechanism is changed. Based on multiphoton ionization, collisional ionization and the network depolymerization in the borate glass, production of the plasma drives the microstructure rearrangement near the laser beam focusing area. From the structure of glass and crystal analysis, we conclude that the complicated borate groups containing BO 3 and BO 4 units inside the glass are converted into(B 3O 6) -3 anion rings.展开更多
We provide a novel hollow-core holey fibre that owns a random distribution of air holes in the cladding. Our experiments demonstrate that many of the features previously attributed to photonic crystal fibres with perf...We provide a novel hollow-core holey fibre that owns a random distribution of air holes in the cladding. Our experiments demonstrate that many of the features previously attributed to photonic crystal fibres with perfect arrangement of air holes, in particular, photonic bandgap guidance, can also be obtained in the fibre. Additionally, this fibre exhibits a second guided mode with both the two-lobe patterns, and each pattern is in different colour.展开更多
Microstructure optical fiber with uniform intensity distribution of the fundamental mode is proposed. The design guide line and characteristics of this kind fiber are demonstrated. The relationship between refractive ...Microstructure optical fiber with uniform intensity distribution of the fundamental mode is proposed. The design guide line and characteristics of this kind fiber are demonstrated. The relationship between refractive index profile and structure parameters is investigated. The mechanism of forming uniform fundamental mode in these fibers is analyzed.展开更多
The mechanism of near infrared (IR) focused femtosecond (fs) laser induced defects in silica glasses produced by different methods is systematically investigated through measurements of absorption, fluorescence, and e...The mechanism of near infrared (IR) focused femtosecond (fs) laser induced defects in silica glasses produced by different methods is systematically investigated through measurements of absorption, fluorescence, and electronic spin resonance (ESR) spectra. The influence of impurities and hydroxyl groups on defects is discussed. The results show that ES silica glasses containing high OH and few defects are much stable under fs laser irradiation. It is also verified that Si E_δ~′center formation has no direct relation with chloride ions.展开更多
文摘The fabrication of one kind of large core area Nd3 + doped silicate glass photonic crystal fiber, and demonstration of the fiber's waveguidence properties were reported. This fiber owns a random air hole distribution in the cladding. The measured minimum loss of this kind of fiber is 10 dB·m-1 at 660 nm. These fibers can sustain only a single mode at least over wavelength ranging from 660 nm to 980 nm.
文摘In this paper, we put emphasis on the analysis the mechanism of the photon induced frequency conversion β BaB 2O 4 crystal inside a borate glass using femtosecond laser. Because of the nature of femtosecond laser's ultra short pulse duration and high energy density, in essence the laser glass interaction mechanism is changed. Based on multiphoton ionization, collisional ionization and the network depolymerization in the borate glass, production of the plasma drives the microstructure rearrangement near the laser beam focusing area. From the structure of glass and crystal analysis, we conclude that the complicated borate groups containing BO 3 and BO 4 units inside the glass are converted into(B 3O 6) -3 anion rings.
基金Supported by the National Natural Science Foundation of China under Grant Nos 50125258 and 60377040, and the Shanghai Nanotechnology Promote Centre （0352nm042）.
文摘We provide a novel hollow-core holey fibre that owns a random distribution of air holes in the cladding. Our experiments demonstrate that many of the features previously attributed to photonic crystal fibres with perfect arrangement of air holes, in particular, photonic bandgap guidance, can also be obtained in the fibre. Additionally, this fibre exhibits a second guided mode with both the two-lobe patterns, and each pattern is in different colour.
基金This work was supported by the National Natural Science Foundation of China (No. 50125208 and 60377040)the Shanghai Nanotechnology PromotionCenter (No. 0352nm042).
文摘Microstructure optical fiber with uniform intensity distribution of the fundamental mode is proposed. The design guide line and characteristics of this kind fiber are demonstrated. The relationship between refractive index profile and structure parameters is investigated. The mechanism of forming uniform fundamental mode in these fibers is analyzed.
基金This work was supported by the National Natural Science Foundation of China (No. 10074011)the Ministry of Science and Technology of China (No. 2001CCA04600).
文摘The mechanism of near infrared (IR) focused femtosecond (fs) laser induced defects in silica glasses produced by different methods is systematically investigated through measurements of absorption, fluorescence, and electronic spin resonance (ESR) spectra. The influence of impurities and hydroxyl groups on defects is discussed. The results show that ES silica glasses containing high OH and few defects are much stable under fs laser irradiation. It is also verified that Si E_δ~′center formation has no direct relation with chloride ions.
