2013
DOI: 10.1364/oe.21.012053
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Modeling of transient modal instability in fiber amplifiers

Abstract: A model of transient modal instability in fiber amplifiers is presented. This model combines an optical beam propagation method that incorporates laser gain through local solution of the rate equations and refractive index perturbations caused by the thermo-optic effect with a time-dependent thermal solver with a quantum defect heating source term. This model predicts modal instability a fiber amplifier operating at 241, 270, and 287 Watts of output power characterized by power coupling to un-seeded modes, the… Show more

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Cited by 65 publications
(36 citation statements)
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“…Concurrently, there have been numerous advances in tactically relevant HEL modeling, including advances related to wave optics simulation, nonlinear thermal blooming, combined turbulence and thermal blooming effects, and lower atmosphere conditions. [1][2][3][4][5][6][7] However, even at shorter tactical ranges, HEL tracking requirements are very demanding. 8 Yet little published research exists regarding the potential tracking advantages of active (laser) illumination and the resulting detrimental speckle effects at tactical ranges.…”
Section: Introductionmentioning
confidence: 99%
“…Concurrently, there have been numerous advances in tactically relevant HEL modeling, including advances related to wave optics simulation, nonlinear thermal blooming, combined turbulence and thermal blooming effects, and lower atmosphere conditions. [1][2][3][4][5][6][7] However, even at shorter tactical ranges, HEL tracking requirements are very demanding. 8 Yet little published research exists regarding the potential tracking advantages of active (laser) illumination and the resulting detrimental speckle effects at tactical ranges.…”
Section: Introductionmentioning
confidence: 99%
“…The recent discovery of transverse mode instability (TMI) in high-power fiber amplifiers [1] has motivated experimental [2][3][4] and theoretical [5][6][7][8][9][10][11][12][13] efforts to characterize and explain this phenomenon. TMI manifests itself as an instability in which the signal power fluctuates on a ms timescale between the fundamental mode (FM) and the first few higher-order modes (HOMs) when the average signal power is increased above a certain threshold.…”
Section: Introductionmentioning
confidence: 99%
“…For consistency of comparison, this arrangement is also maintained for the PCF and SAT fiber designs. All optical and mechanical properties of the fibers are the same as those given in prior works [5,11] except that the two varieties of Yb-doped glass are characterized by acoustic velocities of 5851 m/s and 5769 m/s and bulk Brillouin line widths of 45 and 46 MHz but have the same Yb doping concentrations. Figure 1 depicts the acoustic and doping profiles of each fiber.…”
mentioning
confidence: 99%