Selvas, R., Sahu, J.K., Fu, L.B., Jang, J.N., Nilsson, J., Grudinin, A.B., Ylä-Jarkko, K., Alam, S.-U., Turner, P.W. and Moore, J. (2003) High-power, low-noise, Yb-doped, cladding-pumped, three-level fiber sources at 980 nm. Optics Letters, 28 (13), 1093-1095. (doi:10.1364/OL.28.001093).
Abstract
We present results on a high-power, cladding-pumped, Yb-doped fiber emitting at 977nm in laser and amplified-spontaneous-emission source configurations. We obtained up to 1.4W of fiber-coupled, single-mode output power and slope efficiency as high as 68%. To our knowledge these are the highest powers and efficiencies achieved from a single-mode fiber laser at 980 nm and the first demonstrated results on a high-power amplified-spontaneous-emission source in this wavelength range. High power and high slope efficiency are achieved by using a high numerical aperture 0.7, a jacketed air-clad fiber, and a high-brightness pump source. Both types of sources exhibit relative intensity noise below -130 dB / Hz and are thus suitable for a wide range of applications.
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