Topic
Equilibrium mode distribution
About: Equilibrium mode distribution is a research topic. Over the lifetime, 928 publications have been published within this topic receiving 14939 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors considered the case of one mode (or a small group of modes) being selected, by means of a wavelength selective element, out of the whole spectrum of a cw laser.
9 citations
TL;DR: In this paper, a mode converter is proposed, which passes through a TE10 mode for low frequency range and converts TE10 to TE20 mode for the high frequency range for a single-mode waveguide with dielectric rods arrayed at the center of the waveguide.
Abstract: We have reported that single-mode propagation is available for a metallic waveguide with dielectric rods arrayed at the center of the waveguide in the frequency under twice the cutoff frequency region using the TE10 mode, and in the frequency over twice the cutoff frequency region using the TE20 mode. In this investigation, a mode converter is proposed, which passes through a TE10 mode for low frequency range and converts TE10 to TE20 mode for the high frequency range. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 169–171, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24886
9 citations
TL;DR: A Fox and Li analysis for a laser resonator with a radially varying gain yields a picture of the mode evolution dynamics and a steady-state mode distribution which are different from the constant-gain case.
Abstract: A Fox and Li analysis [Bell Syst. Tech J. 40, 453 (1961); Proc. IEEE 51, 80 (1963); IEEE J. Quantum Electron QE-4, 460 (1968)] for a laser resonator with a radially varying gain yields a picture of the mode evolution dynamics and a steady-state mode distribution which are different from the constant-gain case. When an axially maximal gain is sharply peaked, the mode-settling time is markedly reduced and the final mode distribution is more tightly focused. When the gain distribution is sharply annular, an annular or ``doughnut''-shaped mode develops. In some intermediate cases, which may be relevant to some gas lasers, a stable transverse mode never definitively evolves. Misalignments of the gain with the cavity yield distortions to the mode shape and these are also explored.
9 citations
TL;DR: In this article, the long-term output mode shape degradation in pulsed Yb-doped fiber amplifiers is reported for the first time, caused by the formation of the long period grating responsible for power transfer from the fundamental mode to the first high order mode.
Abstract: Experimental observation of long-term output mode shape degradation in pulsed Yb-doped fiber amplifiers is reported for the first time. The process occurs in large mode area Yb-doped fibers and is caused by the formation of the long period grating responsible for power transfer from the fundamental mode to the first high-order mode. The linkage between the process and photodarkening was revealed.
9 citations
TL;DR: In this article, a method based on fiber gratings for measuring the effective indices of fiber modes is proposed, and the effective index difference between the core mode and a cladding mode is obtained by analyzing the interference fringe of a pair of cascaded long-period fiber grins.
Abstract: A novel method based on fiber gratings for measuring the effective indices of fiber modes is proposed. The effective index difference between the core mode and a cladding mode was obtained by analyzing the interference fringe of a pair of cascaded long-period fiber gratings. In order to extract the core mode index from the measured index difference, an index matching oil immersion method is proposed. By analyzing the interaction between the cladding mode and the oil applied on the cladding surface, the mode order and the effective index of the involved cladding mode might be calculated. Experimental results about the interference fringe shifts induced by the oil index and the oil-applied length are also presented.
9 citations