Article

Narrow-linewidth ytterbium-doped fiber amplifier system with 45 nm tuning range and 133 W of output power

Laser Zentrum Hannover e.V., Hanover, Lower Saxony, Germany
Optics Letters (Impact Factor: 3.29). 09/2007; 32(16):2345-7. DOI: 10.1364/OL.32.002345
Source: PubMed

ABSTRACT

We report on a master-oscillator ytterbium-doped fiber amplifier system with up to 133 W of continuous-wave output power using a tunable narrow-linewidth external-cavity diode laser seed source. Stable tunable high-power operation was demonstrated from 1040 nm to 1085 nm with more than 12 dB suppression of amplified spontaneous emission.

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    • "There are a number of reports on tunable Yb fiber laser and amplifier [1], [3]–[6]. For common wavelengths around 1060 nm, 133 W fiber amplifier was demonstrated by Hildebrandt et al. with a 45 nm tuning range [4]. For laser or amplifier operating at the edge of Yb gain spectrum, amplified spontaneous emission (ASE) at the center of the gain spectrum would result in spectral contamination and ultimately saturate the gain more effectively than the laser [5]. "
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    ABSTRACT: A Yb-doped linearly polarized fiber ring oscillator continuously tunable from 1000 to 1099 nm is built and amplification over the whole range is investigated with emphasis on the short wavelength regime of 1000-1025 nm. With an all-fiber single-mode polarization-maintaining master oscillator power amplifier, over 10 W output from 1010 to 1090 nm and over 30 W from 1014 to 1080 nm are achieved. At wavelength <1020 nm, bandpass filters are inserted for suppressing amplified spontaneous emission. The source can be used in a variety of applications, including laser cooling of Yb-doped solids.
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    ABSTRACT: A radially polarized beam was amplified up to 1.1 W by passing through an Yb-doped double clad fiber pumped by a semiconductor laser, maintaining both the polarization and intensity patterns of the input beam.
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    ABSTRACT: We present a high-power ytterbium fiber amplifier based on active tapered double-clad fiber (T-DCF) and capable of high single-pass gain. The T-DCF power amplifier seeded with a 320 mW narrow-band signal generates up to 110 W of average output power corresponding to more than 25 dB gain. The amplifier exhibits near-diffraction-limited beam quality (M 2 = 1.06) at the highest output power, which was limited by the available pump power. With a broadband seed source, the amplifier produced a gain of nearly 40 dB obtained for low-signal limit of the seed. The high output power combined with high gain is achieved owing to amplified spontaneous emission (ASE) filtering and increased stimulated Brillouin scattering (SBS) threshold inherent to the axially non-uniform geometry. The amplifier operates efficiently with a wide range of input seed powers thus providing the basis for one-stage tapered amplifier which combines the functions of preamplifier and power amplifier and can be a competitive alternative to multi-stage design.
    Full-text · Article · Nov 2012 · Laser Physics
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