High-power Q-switched erbium fiber laser using an all-fiber intensity modulator

Analysis and Optimization of a Q-Switched Erbium Doped Fiber Laser Working with a Short Rise Time Modulator

“…The parameters concerning three experimental configurations described in [10], [9], and [11] have been successively introduced into the presented calculations. In the first case [10], the laser is a linear configuration with a 0.75-m Er 3+ -doped fiber, using a slow (T R = 0.3 µs), low-loss (α = 0.15 dB) mechanical modulator based on the change in coupling coefficient of a polished fiber coupler versus the relative positions of the polished zones.…”

“…In the first case [10], the laser is a linear configuration with a 0.75-m Er 3+ -doped fiber, using a slow (T R = 0.3 µs), low-loss (α = 0.15 dB) mechanical modulator based on the change in coupling coefficient of a polished fiber coupler versus the relative positions of the polished zones. The fluorescence life time for the 980-nm pump excitation is 10.3 ms corresponding to a Er 3+ concentration of about 1500 ppm.…”

A novel spiral high impedance surface structure for size reduction

“…This can be done by including the fast phase dependence of the current distribution into the MM basis functions, so that much fewer unknowns (or "current modes") are required to represent the slowly varying residual current. The idea has been pioneered for 2D problems [7], and later applied to 3D closed geometries (using pulse expansion functions and point matching within a magnetic field integral equation formulation [8]). This methodology has been further extended to both open and closed arbitrary 3D bodies, by including a linear-phase propagation term into the well-known triangular rooftop basis/testing vector functions developed by Rao, Wilton, and Glisson (RWG) [9], providing the so-called linearly-phased RWG (LP-RWG) basis functions for surfaces [10] and their counterparts for large wire geometries [11].…”

“…In recent years, there has been growing interests in investigating electromagnetic band gap (EBG) structures, and diversified kinds of EBG structures have been suggested for the applications in the electromagnetic and antenna community [1][2][3][4][5][6][7]. Because the period of EBG lattices has to be a half-wavelength at the band-gap frequency, practical application of EBG structures usually has difficulty in accommodating its physical size, and realizing compact size for EBG structure is one of the most important issues to be solved.…”

“…Because the period of EBG lattices has to be a half-wavelength at the band-gap frequency, practical application of EBG structures usually has difficulty in accommodating its physical size, and realizing compact size for EBG structure is one of the most important issues to be solved. Recently high impedance surfaces (HIS), as a successful compact EBG structure consisted of small metal pads with grounding vias, have been exclusively investigated [5][6][7]. However, in some practical applications, such as in antenna array, the spacing of neighboring antenna element has to be less than a half wavelength of operating frequency, the Sievenpiper HIS structure is still too large to be fixed on the antenna.…”