The Experts below are selected from a list of 6615 Experts worldwide ranked by ideXlab platform
Mali Gong - One of the best experts on this subject based on the ideXlab platform.
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bidirectional pumped high power raman fiber laser
Optics Express, 2016Co-Authors: Qirong Xiao, Ping Yan, Jidong Sun, Xiangnan Wang, Yi Huang, Mali GongAbstract:This paper presents a 3.89 kW 1123 nm Raman all-fiber laser with an overall optical-to-optical efficiency of 70.9%. The system consists of a single-wavelength (1070nm) seed and one-stage bidirectional 976 nm non-wavelength-stabilized laser diodes (LDs) pumped Yb-doped fiber amplifier. The unique part of this system is the application of non-wavelength-stabilized LDs in high power bidirectional Pumping Configuration fiber amplifier via refractive index valley fiber combiners. This approach not only increases the pump power, but also shortens the length of fiber by avoiding the usage of multi-stage amplifier. Through both theoretical research and experiment, the bidirectional Pumping Configuration presented in this paper proves to be able to convert 976 nm pump laser to 1070 nm laser via Yb3+ transfer, which is then converted into 1123 nm Raman laser via the first-order Raman effect without the appearance of any higher-order Raman laser.
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high power all fiber superfluorescent source with fused angle polished side Pumping Configuration
Applied Optics, 2011Co-Authors: Qirong Xiao, Yaping Wang, Mali GongAbstract:We report high-power operation of a broadband superfluorescent source with an all-fiber Configuration. The superfluorescent source yields an amplified spontaneous emission (ASE) output of 43.2 and 25.1 W from both ends, respectively. The maximum combined ASE output is 68.3 W with a slope efficiency of 78.6%. The wavelength bandwidths (FWHM) of the counterpropagating and copropagating ASE output are 31.5 and 18.9 nm, respectively. The fused angle-polished side-Pumping coupler is applied to set up the all-fiber Configuration. Furthermore, the influence of reflectivity on the laser threshold of the ASE sources is studied theoretically. The experimental results agree with the theoretical analysis.
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high power all fiber superfluorescent source with fused angle polished side Pumping Configuration
Applied Optics, 2011Co-Authors: Qirong Xiao, Ping Yan, Yaping Wang, Jinping Hao, Mali GongAbstract:We report high-power operation of a broadband superfluorescent source with an all-fiber Configuration. The superfluorescent source yields an amplified spontaneous emission (ASE) output of 43.2 and 25.1 W from both ends, respectively. The maximum combined ASE output is 68.3 W with a slope efficiency of 78.6%. The wavelength bandwidths (FWHM) of the counterpropagating and copropagating ASE output are 31.5 and 18.9 nm, respectively. The fused angle-polished side-Pumping coupler is applied to set up the all-fiber Configuration. Furthermore, the influence of reflectivity on the laser threshold of the ASE sources is studied theoretically. The experimental results agree with the theoretical analysis.
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100 w ytterbium doped monolithic fiber laser with fused angle polished side Pumping Configuration
Laser Physics Letters, 2011Co-Authors: Qirong Xiao, Ping Yan, Jinping Hao, Shupeng Yin, Mali GongAbstract:Obtaining sufficient pump power is an engineering challenge in scaling fiber laser toward high power. A side-Pumping all-fiber coupler with the coupling efficiency of 90.1% and the coupling power of 144.7 W was reported. The angle-polished Pumping fiber was fused with the double-clad main fiber by carbon dioxide laser. The core of double-clad fiber was not interrupted. Based on this side-Pumping coupler, a fiber laser with flexible Configuration was demonstrated. The output power and the slope efficiency of fiber laser was 102.5 W and 77.1%, respectively. This side-Pumping fiber coupler was beneficial to investigate efficient and reliable high power fiber lasers and amplifiers.
Wencai Huang - One of the best experts on this subject based on the ideXlab platform.
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high Pumping efficiency and wideband l band erbium doped fiber ase source using two stage double pass backward Pumping Configuration
Proceedings of SPIE, 2009Co-Authors: Benrui Zheng, Wencai HuangAbstract:We present a wideband and high Pumping-efficiency L-band erbium-doped fiber (EDF) amplified spontaneous emission (ASE) source using a two-stage double pass backward (DPB) Pumping Configuration.DPB Configuration has been proved to have a high Pumping-efficiency. In this paper we use a two-stage DPB Pumping Configuration to generate a stable L-band ASE source for the first time. The source consists of two sections of EDF, a 1480nm Pumping laser diode (LD) which is divided into two portions to pump two sections of EDF separately. By using a power splitter, the Pumping power of two stages can be adjusted proportionally. The effects of EDF length and pump power arrangement on the output characteristics of L-band ASE spectrum, output power and mean wavelength are theoretically investigated. The results show that the Pumping-conversion efficiency and the linewidth can be improved significantly by optimizing the fiber length ratio and pump ratio of the two-stage DPB Configuration. Based on former work, the total fiber length is chosen at 19m in this paper. With the total fiber length fixed, the proposed source has a high Pumping efficiency of 53%, an output power of 111mW, and a broadening linewidth of 49nm with the mean wavelength at 1580.18nm under the optimizing fiber ratio of 0.842 and pump power ratio of 0.5.
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low ripple and high efficiency c l band erbium doped fiber amplified spontaneous emission sources using a dual forward Pumping Configuration
Optical Engineering, 2008Co-Authors: Wencai Huang, Xiulin Wang, Benrui Zheng, Minghao Sun, Zhiping CaiAbstract:We have experimentally investigated a new two-stage C+L-band (1525 to 1605-nm) amplified spontaneous emission (ASE) fiber source using a dual forward Pumping Configuration. The proposed source offers a high Pumping efficiency of 24.6%, output power of about 52 mW, and a wide bandwidth of 80 nm. Without using any external spectral filters, the source has a low spectral ripple between 2.4 and 2.9 dB for different Pumping power levels. This designed Configuration is also suitable for high-efficiency L-band ASE. The obtained source will be useful in characteristic measurement for wavelength-division multiplexing components and spectrum-sliced multiwavelength fiber sources for local access networks.
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a c l band erbium doped fiber ase source using dual forward Pumping Configuration
Asia Optical Fiber Communication and Optoelectronics Conference, 2007Co-Authors: Wencai Huang, Xiulin Wang, Benrui Zheng, Chaohong Huang, Zhiping CaiAbstract:We present a C+L-band ASE fiber source using double-pass dual-forward Pumping Configuration. The proposed ASE source offers a high Pumping efficiency of 24.6%, output power of 52 mW and a wide bandwidth of about 80 nm.
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stable and wideband l band erbium superfluorescent fiber source using improved bi directional Pumping Configuration
Optics Express, 2007Co-Authors: Wencai Huang, Xiulin Wang, Benrui Zheng, Zhiping CaiAbstract:We have proposed and demonstrated a wideband and wavelength stable L-band erbium-doped superfluorescent fiber source (SFS) using an improved double-pass bi-directional (DP-BD) Pumping Configuration with a segment of un-pumped fiber. The effects of the fiber length and pump power arrangements on the output characteristics of the L-band SFS are examined. Simulations and experiments show that the output characteristics of the L-band SFS are significantly improved by using an un-pumped fiber in the DP-BD Pumping Configuration. This designed Configuration allows a wavelength stable L-band SFS operation with a broadening bandwidth of 52.6nm, an enhanced Pumping efficiency of 47.5%, and a mean wavelength of 1580.42nm.
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simulation analysis of one stage c l band erbium doped fiber ase source with double pass bi directional Pumping Configuration
Chinese Optics Letters, 2004Co-Authors: Wencai Huang, Hai MingAbstract:A new technique to generate a C+L-band flat amplified spontaneous emission (ASE) source in one-stage erbium-doped fiber (EDF) using bi-directional Pumping Configuration is analyzed. The simulation results show that the key point of obtaining flat C+L-band ASE spectrum in one-stage EDF is using a laser diode operated at 980 nm as backward pump source. ASE source with nearly 80-nm bandwidth can be obtained by means of selecting suitable fiber length and properly adjusting the ratio of forward to backward pump power.
Zhiping Cai - One of the best experts on this subject based on the ideXlab platform.
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low ripple and high efficiency c l band erbium doped fiber amplified spontaneous emission sources using a dual forward Pumping Configuration
Optical Engineering, 2008Co-Authors: Wencai Huang, Xiulin Wang, Benrui Zheng, Minghao Sun, Zhiping CaiAbstract:We have experimentally investigated a new two-stage C+L-band (1525 to 1605-nm) amplified spontaneous emission (ASE) fiber source using a dual forward Pumping Configuration. The proposed source offers a high Pumping efficiency of 24.6%, output power of about 52 mW, and a wide bandwidth of 80 nm. Without using any external spectral filters, the source has a low spectral ripple between 2.4 and 2.9 dB for different Pumping power levels. This designed Configuration is also suitable for high-efficiency L-band ASE. The obtained source will be useful in characteristic measurement for wavelength-division multiplexing components and spectrum-sliced multiwavelength fiber sources for local access networks.
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a c l band erbium doped fiber ase source using dual forward Pumping Configuration
Asia Optical Fiber Communication and Optoelectronics Conference, 2007Co-Authors: Wencai Huang, Xiulin Wang, Benrui Zheng, Chaohong Huang, Zhiping CaiAbstract:We present a C+L-band ASE fiber source using double-pass dual-forward Pumping Configuration. The proposed ASE source offers a high Pumping efficiency of 24.6%, output power of 52 mW and a wide bandwidth of about 80 nm.
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stable and wideband l band erbium superfluorescent fiber source using improved bi directional Pumping Configuration
Optics Express, 2007Co-Authors: Wencai Huang, Xiulin Wang, Benrui Zheng, Zhiping CaiAbstract:We have proposed and demonstrated a wideband and wavelength stable L-band erbium-doped superfluorescent fiber source (SFS) using an improved double-pass bi-directional (DP-BD) Pumping Configuration with a segment of un-pumped fiber. The effects of the fiber length and pump power arrangements on the output characteristics of the L-band SFS are examined. Simulations and experiments show that the output characteristics of the L-band SFS are significantly improved by using an un-pumped fiber in the DP-BD Pumping Configuration. This designed Configuration allows a wavelength stable L-band SFS operation with a broadening bandwidth of 52.6nm, an enhanced Pumping efficiency of 47.5%, and a mean wavelength of 1580.42nm.
Qirong Xiao - One of the best experts on this subject based on the ideXlab platform.
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bidirectional pumped high power raman fiber laser
Optics Express, 2016Co-Authors: Qirong Xiao, Ping Yan, Jidong Sun, Xiangnan Wang, Yi Huang, Mali GongAbstract:This paper presents a 3.89 kW 1123 nm Raman all-fiber laser with an overall optical-to-optical efficiency of 70.9%. The system consists of a single-wavelength (1070nm) seed and one-stage bidirectional 976 nm non-wavelength-stabilized laser diodes (LDs) pumped Yb-doped fiber amplifier. The unique part of this system is the application of non-wavelength-stabilized LDs in high power bidirectional Pumping Configuration fiber amplifier via refractive index valley fiber combiners. This approach not only increases the pump power, but also shortens the length of fiber by avoiding the usage of multi-stage amplifier. Through both theoretical research and experiment, the bidirectional Pumping Configuration presented in this paper proves to be able to convert 976 nm pump laser to 1070 nm laser via Yb3+ transfer, which is then converted into 1123 nm Raman laser via the first-order Raman effect without the appearance of any higher-order Raman laser.
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high power all fiber superfluorescent source with fused angle polished side Pumping Configuration
Applied Optics, 2011Co-Authors: Qirong Xiao, Yaping Wang, Mali GongAbstract:We report high-power operation of a broadband superfluorescent source with an all-fiber Configuration. The superfluorescent source yields an amplified spontaneous emission (ASE) output of 43.2 and 25.1 W from both ends, respectively. The maximum combined ASE output is 68.3 W with a slope efficiency of 78.6%. The wavelength bandwidths (FWHM) of the counterpropagating and copropagating ASE output are 31.5 and 18.9 nm, respectively. The fused angle-polished side-Pumping coupler is applied to set up the all-fiber Configuration. Furthermore, the influence of reflectivity on the laser threshold of the ASE sources is studied theoretically. The experimental results agree with the theoretical analysis.
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high power all fiber superfluorescent source with fused angle polished side Pumping Configuration
Applied Optics, 2011Co-Authors: Qirong Xiao, Ping Yan, Yaping Wang, Jinping Hao, Mali GongAbstract:We report high-power operation of a broadband superfluorescent source with an all-fiber Configuration. The superfluorescent source yields an amplified spontaneous emission (ASE) output of 43.2 and 25.1 W from both ends, respectively. The maximum combined ASE output is 68.3 W with a slope efficiency of 78.6%. The wavelength bandwidths (FWHM) of the counterpropagating and copropagating ASE output are 31.5 and 18.9 nm, respectively. The fused angle-polished side-Pumping coupler is applied to set up the all-fiber Configuration. Furthermore, the influence of reflectivity on the laser threshold of the ASE sources is studied theoretically. The experimental results agree with the theoretical analysis.
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100 w ytterbium doped monolithic fiber laser with fused angle polished side Pumping Configuration
Laser Physics Letters, 2011Co-Authors: Qirong Xiao, Ping Yan, Jinping Hao, Shupeng Yin, Mali GongAbstract:Obtaining sufficient pump power is an engineering challenge in scaling fiber laser toward high power. A side-Pumping all-fiber coupler with the coupling efficiency of 90.1% and the coupling power of 144.7 W was reported. The angle-polished Pumping fiber was fused with the double-clad main fiber by carbon dioxide laser. The core of double-clad fiber was not interrupted. Based on this side-Pumping coupler, a fiber laser with flexible Configuration was demonstrated. The output power and the slope efficiency of fiber laser was 102.5 W and 77.1%, respectively. This side-Pumping fiber coupler was beneficial to investigate efficient and reliable high power fiber lasers and amplifiers.
Takunori Taira - One of the best experts on this subject based on the ideXlab platform.
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highly efficient Pumping Configuration for microchip solid state laser
Optics InfoBase Conference Papers, 2006Co-Authors: Traian Dascalu, Takunori TairaAbstract:We present a new geometry for edge-Pumping of a solid-state microchip laser. This design, which consists of a thin-disk gain crystal that has on top a diffusion bonded undoped material that guides the pump light, allows a good thermal heat management by reducing the thickness of the gain media, whereas the pump optics is kept simple. Simulations show that more than 0.95 of the pump radiation with uniformity coefficient in excess of 0.95 can be absorbed in an Yb:YAG/YAG composite device that has a 200-μm thick, 15-at.% Yb:YAG of 3.6-mm diameter. First experiments with this Configuration produced on-time 34 W output power for 220 W on-time pump power and 0.26 slope efficiency. Power scaling possibilities are discussed.
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highly efficient new Pumping Configuration for microchip solid state laser
Conference on Lasers and Electro-Optics, 2005Co-Authors: Traian Dascalu, Takunori TairaAbstract:We propose a new Pumping scheme which allows 94% absorption efficiency in Yb:YAG 15 at.% with 200 /spl mu/m thickness with uniform pump distribution. This Configuration can be scaled up and it is very attractive especially for high power quasi-4-levels lasers where the reabsorption losses are important. First results, which was obtained by using three optical fiber delivery JOLD-100-CAXF-15A (JenaOptik) diode lasers 100 W output power, shows good agreement with the numerical model of absorbed power distribution and thermal field.
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90 w continuous wave diode edge pumped microchip composite yb y3al5o12 laser
Applied Physics Letters, 2003Co-Authors: Traian Dascalu, N Pavel, Takunori TairaAbstract:High-power continuous-wave (cw) operation of a diode edge-pumped microchip composite Yb:Y3Al5O12 (YAG) laser is reported. Up to 90 W were obtained from a 400-μm-thick Yb:YAG/YAG structure with a 10 at. % Yb:YAG square core of 2×2 mm2 area; the slope efficiency and optical-to-optical efficiency with respect to the pump power were 40% and 28%, respectively. Measurements of the optical phase distortions induced by Pumping gives a focus shift bellow 0.05 m and shows the absence of astigmatic effects, indicating the axial heat flow in this Pumping Configuration.
