Project ? 1777 p Theoretical studies of scaling double - clad fiber lasers to high power
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Analysis of Steady-State Brillouin Nonlinearity in High-Power Fiber Lasers
In the present work, a theoretical analysis of the first-order of stimulatedBrillouin scattering (SBS) in a double-clad (DC) ytterbium (Yb)-doped silica fiber laserin unidirectional pumping mode is presented.An accurate simulation for calculating SBS nonlinearity is performed by considering thecoupled differential rate equations for pump, signal and Stokes powers, as wel...
متن کاملInvestigation of Thermal Dispersion and Thermally-Induced Birefringence on High-Power Double Clad Yb:Glass Fiber Laser
In this work the effects of heat generation on the modes of Yb:Glass double clad fiber laser were investigated. The thermal dispersion and thermally-induced birefringence were considered when the gain medium becomes an anisotropic medium. The results showed considerable modifications of laser modes profiles, in particular for transfer magnetic (TM) and transfer electric (TE) modes which their p...
متن کاملAir-clad fibers: pump absorption assisted by chaotic wave dynamics?
Wave chaos is a concept which has already proved its practical usefulness in design of double-clad fibers for cladding-pumped fiber lasers and fiber amplifiers. In general, classically chaotic geometries will favor strong pump absorption and we address the extent of chaotic wave dynamics in typical air-clad geometries. While air-clad structures supporting sup-wavelength convex air-glass interfa...
متن کاملHigh-power fiber laser based on a non filamented-core fully-aperiodic large pitch fiber
Since the double-clad fiber architectures development, fiber-based lasers have witnessed an impressive power scaling [1]. The rise of the extracted signal power has been accompanied by the development of Very Large Mode Area (VLMA) fiber designs allowing the overtake of some key hurdles like the non-linear process or photo-darkening [2]. However, due to a significant deposition of heat along an...
متن کاملHigh-Power Continuous-Wave Directly-Diode-Pumped Fiber Raman Lasers
We describe novel fiber Raman lasers pumped directly by spectrally combined high power multimode laser diodes at ∼975 nm and emitting at ∼1019 nm. With a commercial multimode graded-index fiber, we reached 20 W of laser output power with a record slope efficiency of 80%. With an in-house double-clad fiber, the beam quality improved to M = 1.9, albeit with lower output power and slope efficiency...
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تاریخ انتشار 2001