KEYWORDS: Doping, High power fiber lasers, Fiber lasers, Ytterbium, Aluminum, High power lasers, Cladding, Refractive index, Laser optics, Quantum efficiency
In this report, two kinds of ytterbium doped double-cladding fibers (YDFs) are fabricated by Modified Chemical Vapor Deposition (MCVD) in conjunction with solution doping technology. The fiber core contains SiO2, Yb2O3, Al2O3, and P2O5. After testing in a master oscillator power amplifier (MOPA) configuration, the maximum laser output power of 25μm-core YDF and 30μm-core YDF reaches 3kW and 10kW. In addition, nonlinear effects are not found in the experiment. The experiment results experience that solution doping is a promising technology to fabricate high power laser fiber.
A high-power and broadband super-fluorescent source (SFS) based on an Yb-doped double-cladding fiber is described. The source is pumped at 976 nm from a laser diode by end-pumping system. The SFS generated a maximum 100 mW of broadband emission centered at 1066nm, with an about 40nm FWHM spectrum. The basic characteristics of the superfluorescent source, such as the output power and output linewidth, have been analyzed and studied.
By using Yb3+-doped double-clad fiber with rectangular inner-cladding, and a set of back-cavity mirrors with different transmission ratio, the double-clad fiber lasers are constructed. It is found that the back-cavity mirror with a higher transmission ratio is better; a back-cavity mirror can control laser wavelength; the relationship between slope efficiency and transmission ratio is in accordance with exponential function, the maximum slope efficiency is about 60%.
Based on optical adherence technique, a novel single-to-double clad fiber coupler for high power double clad fiber laser and amplifier is demonstrated. The coupler is made by polishing a single clad fiber at a small bevel angle and adhered to the doped double clad fiber. In this paper, we design and simulate this fiber coupler and fmd the coupling efficiency is sensitive to the fiber's parameter. For given fiber's parameter, the coupling efficiency of 80% can be achieved.
A novel Yb3+-doped double-clad silica fiber with rectangular inner cladding was designed and developed using MCVD process, solution-doping and optical machining altogether. The dimension of inner classing is 100(Mu) mx70micrometers , and Yb3+-doped concentration in the core is about 0.24wt%. The operation of the fiber laser pumped by inner cladding is reported. The threshold of laser is 34mW. When the pump power launched is 141mW, the laser output is 84mW at the wavelength and 1075.6nm, and slope efficiency is 77%.
The objective of this paper is to give an overview of the different studies we have performed at the research level regarding the design and implementation of a photonic wavelength division multiplexing layer providing transparent transport services to client layer. Such a network requires a number of enabling factors to be accessed in order to become a reality. Among these factors are the availability of high- capacity WDM transmission systems and efficient optical routing nodes based on mature technology, etc. In this paper, based on several key build blocks we developed such as fiber lasers, flattened EDFA's, and WADM's, an all-fiber WDM system was demonstrated. A cost effective alternative to OSA was proposed.
In this article, we mainly describe the preparation of the silica optical fiber doped with rare earth ion Tm3+ by utilizing solution-doped technique, and the control of relevant parameters of the fiber. The control and the measurement method of dopantion concentration of Tm3+ have also been discussed.
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