Author
Haiqing Li
Bio: Haiqing Li is an academic researcher from Huazhong University of Science and Technology. The author has contributed to research in topics: Fiber laser & Fiber. The author has an hindex of 11, co-authored 80 publications receiving 573 citations.
Topics: Fiber laser, Fiber, Photonic-crystal fiber, Laser, Materials science
Papers
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TL;DR: A systematic process of theoretical design and experimental fabrication of the large mode area and large negative dispersion photonic crystal fiber is presented and an easily fabricated fiber structure is proposed.
Abstract: We present a systematic process of theoretical design and experimental fabrication of the large mode area and large negative dispersion photonic crystal fiber. An easily fabricated fiber structure is proposed. The influence of structure parameters deviations from the design on the chromatic dispersion are evaluated and a design rule is given. Finally our fabricated fiber and test results are demonstrated. The measured effective area of inner core mode is 40.7 μm2 which is the largest effective area of high negative dispersion photonic crystal fibers that have been experimentally fabricated. The measured peak dispersion is -666.2ps/(nm.km) and the bandwidth is 40nm.
130 citations
TL;DR: A new kind of white light emitting glass suitable for long-wavelength ultraviolet excitation by simultaneously emitting blue, green and red fluorescence, which is fabricated by melting of Ce(3+))-Tb(3+)-Mn(2+) co-doped borosilicate glass is reported.
Abstract: We report on a new kind of white light emitting glass suitable for long-wavelength ultraviolet excitation by simultaneously emitting blue, green and red fluorescence, which is fabricated by melting of Ce(3+)-Tb(3+)-Mn(2+) co-doped borosilicate glass. The spectroscopic properties of singly, doubly and triply doped glasses have been reported and the energy transfer from Ce(3+) to Tb(3+) and Mn(2+) has also been investigated. By adjusting the concentration of different co-dopants, we obtained the ideal white light emitting borosilicate glass with the color coordinate (x = 0.318, y = 0.333).
53 citations
TL;DR: In this paper, a facile method to tailor clusters of active ions by using one kind of porous host, the nanoporous silica glass, was presented by sintering of nanoporous glass impregnated with Ce3+, Tb3+, Mn2+ and Al3+ ions.
Abstract: To tailor clusters of active ions in glasses is laborious but critical for obtaining high efficient luminescence. Here, we present a facile method to tailor clusters of active ions by using one kind of porous host, the nanoporous silica glass. The white light-emitting glasses were prepared by sintering of nanoporous silica glasses impregnated with Ce3+, Tb3+, Mn2+ and Al3+ ions. The combination of blue, green and red emissions of Ce3+, Tb3+ and Mn2+ ions in the glasses under ultraviolet light excitation create white light emissions. The fluorescence of the glasses under long-wavelength ultraviolet excitation are dependent on energy transfer processes between the active ions; and the Al3+ plays a key role in adjusting of the energy transfer processes.
38 citations
TL;DR: A new kind of green-emitting high silica luminous glass, fabricated by sintering of Ce(3+)-Tb(3+) co-doped porous glass, where the role of Ca(2+) has been discussed, and the fluorescence decay curve reveals that the Ca( 2+) play an important role in energy transfer.
Abstract: We report on a new kind of green-emitting high silica luminous glass, which is fabricated by sintering of Ce3+-Tb3+ co-doped porous glass. The spectra show that there are energy transfer between Ce3+ and Tb3+, and cross-relaxation between 5D3 and 5D4 energy level of Tb3+. The energy transfer process can be adjusted by addition of Ca2+ into the Ce3+-Tb3+ co-doped porous glass, and the transfer rate can be enhanced about four times than that of Ce3+-Tb3+ co-doped porous glass. The role of Ca2+ has been discussed, and the fluorescence decay curve reveals that the Ca2+ play an important role in energy transfer.
30 citations
TL;DR: A double negative curvature anti-resonance hollow core fiber, in which, the cladding is constituted of 6 large tubes and 6 small tubes arranged in a staggered pattern, with the best single mode performance with a loss ratio as high as 100,000 between LP11 mode and LP01 mode is obtained.
Abstract: We report on a double negative curvature anti-resonance hollow core fiber, in which, the cladding is constituted of 6 large tubes and 6 small tubes arranged in a staggered pattern. The simulation shows that the loss of the fiber can reach or even exceed the loss of double-clad negative curvature anti-resonance hollow core fibers in short wavelength band, due to the staggered arrangement of two kind of tubes and the double negative curvature on the core boundary. The best single mode performance with a loss ratio as high as 100,000 between LP11 mode and LP01 mode is obtained due to simultaneously inhibited LP11 modes and LP21 modes in the fiber structure. The reason for loss oscillations in long wavelength band and the fabrication feasibility of proposed fiber are also discussed.
29 citations
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01 Jan 2002
TL;DR: In this article, a review of numerical and experimental studies of supercontinuum generation in photonic crystal fiber is presented over the full range of experimentally reported parameters, from the femtosecond to the continuous-wave regime.
Abstract: A topical review of numerical and experimental studies of supercontinuum generation in photonic crystal fiber is presented over the full range of experimentally reported parameters, from the femtosecond to the continuous-wave regime. Results from numerical simulations are used to discuss the temporal and spectral characteristics of the supercontinuum, and to interpret the physics of the underlying spectral broadening processes. Particular attention is given to the case of supercontinuum generation seeded by femtosecond pulses in the anomalous group velocity dispersion regime of photonic crystal fiber, where the processes of soliton fission, stimulated Raman scattering, and dispersive wave generation are reviewed in detail. The corresponding intensity and phase stability properties of the supercontinuum spectra generated under different conditions are also discussed.
360 citations
TL;DR: The results demonstrate that the presented Ce(3+)/Tb( 3+)/Mn(2+) tridoped lithium-strontium-silicate glass may serve as a promising candidate for high-power WLEDs.
Abstract: Thermal management is still a great challenge for high-power phosphor-converted white-light-emitting diodes (pc-WLEDs) intended for future general lighting. In this paper, a series of single-component white-emitting silicate SiO2–Li2O–SrO–Al2O3–K2O–P2O5: Ce3+, Tb3+, Mn2+ (SLSAKP: Ce3+, Tb3+, Mn2+) glasses that simultaneously play key roles as a luminescent convertor and an encapsulating material for WLEDs were prepared via the conventional melt-quenching method, and systematically studied using their absorption spectra, transmittance spectra, photoluminescence excitation and emission spectra in the temperature range 296–498 K, decay curves, and quantum efficiency. The glasses show strong and broad absorption in 250–380 nm region and exhibit intense white emission, produced by in situ mixing of blue-violet, green, and orange-red light from Ce3+, Tb3+, and Mn2+ ions, respectively, in a single glass component. The quantum efficiency of SLSAKP: 0.3%Ce3+, 2.0%Tb3+, 2.0%Mn2+ glass is determined to be 19%. More ...
204 citations
TL;DR: The relevance of the material in high power fiber laser technologies is reviewed, and where appropriate, materials-based paths to the enhancement of laser performance will be underscored.
Abstract: Over the past two decades, fiber laser technologies have matured to such an extent that they have captured a large portion of the commercial laser marketplace. Yet, there still is a seemingly unquenchable thirst for ever greater optical power to levels where certain deleterious light-matter interactions that limit continued power scaling become significant. In the past decade or so, the industry has focused mainly on waveguide engineering to overcome many of these hurdles. However, there is an emerging body of work emphasizing the enabling role of the material. In an effort to underpin these developments, this paper reviews the relevance of the material in high power fiber laser technologies. As the durable material-of-choice for the application, the discussion will mainly be limited to silicate host glasses. The discussion presented herein follows an outward path, starting with the trivalent rare earth ions and their spectroscopic properties. The ion then is placed into a host, whose impact on the spectroscopy is reviewed. Finally, adverse interactions between the laser lightwave and the host are discussed, and novel composition glass fiber design and fabrication methodologies are presented. With deference to the symbiosis required between material and waveguide engineering in active fiber development, this review will emphasize the former. Specifically, where appropriate, materials-based paths to the enhancement of laser performance will be underscored.
138 citations
TL;DR: The state of the art regarding the knowledge of radiation effects on the performance of fiber-based technologies, from the microscopic effects observed in the amorphous silica glass used to design fiber cores and cladding, to the macroscopic response of fibers and systems are described.
Abstract: In this topical review, the recent progress on radiation-hardened fiber-based technologies is detailed, focusing on examples for space applications. In the first part of the review, we introduce the operational principles of the various fiber-based technologies considered for use in radiation environments: passive optical fibers for data links, diagnostics, active optical fibers for amplifiers and laser sources as well as the different classes of point and distributed fiber sensors: gyroscopes, Bragg gratings, Rayleigh, Raman or Brillouin-based distributed sensors. Second, we describe the state of the art regarding our knowledge of radiation effects on the performance of these devices, from the microscopic effects observed in the amorphous silica glass used to design fiber cores and cladding, to the macroscopic response of fiber-based devices and systems. Third, we present the recent advances regarding the hardening (improvement of the radiation tolerance) of these technologies acting on the material, device or system levels. From the review, the potential of fiber-based technologies for operation in radiation environments is demonstrated and the future challenges to be overcome in the coming years are presented.
133 citations
TL;DR: In this paper, the synthesis of Dy3+ doped barium silicate glasses, along with subsequent studies performed to evaluate its viability in solid state lighting applications, were elucidated via X-Ray Diffraction, Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy.
124 citations