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Proceedings Paper

Single-frequency ytterbium-doped fiber laser at 976 nm
Author(s): X. Zhu; W. Shi; J. Zong; D. Nguyen; R. A. Norwood; A. Chavez-Pirson; N. Peyghambarian
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Paper Abstract

Linearly polarized wavelength stable single frequency ytterbium (Yb3+) doped fiber lasers below 1 μm, namely threelevel Yb3+ fiber lasers, are highly demanded for nonlinear wavelength conversion to generate coherent blue light or even deep ultraviolet coherent sources. We present performance of a 976 nm single-frequency core-pumped distributed Bragg reflector (DBR) fiber laser consisting of a 2-cm long highly ytterbium-doped phosphate fiber and a pair of silica fiber Bragg gratings (FBGs) and their use for frequency doubling experiment. The high reflection (HR > 99%) and partial reflection (PR = 60%) FBGs were cleaved very close to the index modulation region and directly spliced to a 2-cm-long highly Yb3+-doped phosphate fiber. Over 100 mW of linearly polarized output with a linewidth less than 2 kHz can be obtained when the launched pump power is about 450 mW. The efficiency of the 976 nm single-frequency fiber laser (the output power vs the launched pump power) is about 25%. The relative intensity noise was measured to be -110 dB/Hz at 1 MHz and the variation of the center wavelength is less than 0.0005 nm during a measurement period of 2.5 hours. This single-frequency fiber laser has an SNR of over 50 dB and there is no strong ASE or spurious lasing at long wavelengths even at the maximum pump power. This all-fiber single-frequency DBR laser with attractive features can be used for efficient blue and UV generation through nonlinear frequency conversion. Moreover, this high-performance 976 nm single-frequency fiber laser can be used as a single-frequency, low RIN pump laser for long wavelength Yb3+-, Er3+-, or Yb3+/Er3+-doped fiber lasers and amplifiers.

Paper Details

Date Published: 26 February 2013
PDF: 8 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86010X (26 February 2013); doi: 10.1117/12.2003207
Show Author Affiliations
X. Zhu, NP Photonics (United States)
College of Optical Sciences, The Univ. of Arizona (United States)
W. Shi, NP Photonics (United States)
J. Zong, NP Photonics (United States)
D. Nguyen, NP Photonics (United States)
R. A. Norwood, College of Optical Sciences, The Univ. of Arizona (United States)
A. Chavez-Pirson, NP Photonics (United States)
N. Peyghambarian, NP Photonics (United States)
College of Optical Sciences, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 8601:
Fiber Lasers X: Technology, Systems, and Applications
Sami T. Hendow, Editor(s)

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