Linearly-polarized Yb-doped Fiber Laser in an All-fiber Configuration

Abstract

Characteristics of polarization selection in Yb fiber laser by use of birefringent fiberBragg gratings are investigated. An 8W, 1064nm linearly-polarized fiber laser with 87% slope efficiency and <20pm bandwidth has been successfully demonstrated.

Dual-Wavelength, Linearly Polarized All-Fiber Laser With High Extinction Ratio

“…The fiber cavity thus designed selects both wavelength and polarization state. The details of the cavity design on single-polarization selection can be found in [4] and [5].…”

“…The highly reflective (HR) FBG was spliced to the gain fiber with its axes aligned, while the output coupler (OC) FBG was cross-spliced to the gain fiber. In that design only one polarization was selected in the cavity [4]. The laser achieved 8 W of output power and 18 dB of PER.…”

Single- and dual-wavelength switchable linear polarized Yb3+-doped double-clad fiber laser

“…However, the drawback of the heating effect of volume Bragg gratings has a great impact on light absorption and scattering, which limits its wide extension. Hirakawa et al utilized two polarization-maintaining fiber Bragg gratings (PM-FBGs) fused at both ends of the gain fiber to compose laser cavity [10] and realized an output laser with PER of 18 dB and linewidth of 0.02 nm, whereas sophisticated temperature control and nontunable laser wavelengths are the main drawbacks of such a scheme. Goto et al [11], using a femtosecond laser, inscribed an FBG in single-polarization photonic bandgap fiber as the output mirror, utilized a dichroic mirror (DM) to import the pumping light, and realized linearly polarized laser output with wavelengths of 1068 nm and PER of 19.6 dB.…”

Single linearly polarized, widely tunable Yb3+-doped fiber laser with alternative polarization and wavelength

“…Hoffman [8] implemented a 30 nm tunable range (from 1020 nm to 1050 nm) with a 14 W maximum output power using 40 μm large core Yb 3+ -doped photonics-crystal fiber as the gain medium and bulk grating as the polarization/wavelength selection element, but its efficiency is 46% and the polarization extinction ratio is 12.1 dB only. In 2007, A. Shirakawa et al [9] achieved a linearly polarized laser output with an 8 W output power using all fiber Yb 3+ -doped [7,[9][10][11].…”

“…A fiber laser with a linearly polarized, widely tunable wavelength range and narrow bandwidth is attractive in a variety of applications, such as nonlinear frequency conversion [3], and coherent beam combining [4], and optical parametric oscillation. Exploring simple and reliable techniques for generating single linearly polarized and widely tunable fiber laser output has been an important topic in the research field [5][6][7][8][9][10].…”