167 W, power scalable ytterbium-doped photonic bandgap fiber amplifier at 1178nm

Department of Chemistry, Korea University, Jochiwon 339-700, Korea.
Optics Express (Impact Factor: 3.49). 08/2010; 18(16):16345-52. DOI: 10.1364/OE.18.016345
Source: PubMed


An ytterbium-doped photonic bandgap fiber amplifier operating at the long wavelength edge of the ytterbium gain band is investigated for high power amplification. The spectral filtering effect of the photonic bandgap efficiently suppresses amplified spontaneous emission at the conventional ytterbium gain wavelengths and thus enables high power amplification at 1178 nm. A record output power of 167 W, a slope efficiency of 61% and 15 dB saturated gain at 1178 nm have been demonstrated using the ytterbium-doped photonic bandgap fiber.

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Available from: Ken-ichi Ueda, Jun 17, 2014
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    • "ANY applications, such as coherent lidar system, nonlinear frequency conversion, coherent beam combining architectures, require high power laser sources with diffraction-limited beam quality. Fiber laser systems, which have earned a solid reputation as a highly power scalable laser with high beam quality, are attractive sources for the aforementioned applications [1] [2] [3]. Generally, high power fiber laser systems employ large mode area (LMA) fibers to overcome the limitation of nonlinear effects and enable higher power scaling [4]. "
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    ABSTRACT: We present detailed studies of the effect of polarization on thermal-induced mode instability (MI) in ytterbium-doped fiber amplifiers. Based on a steady-state theoretical model, which takes both electric fields along the two principal axes into consideration, the effect of polarization effects on the gain of Stokes wave was analyzed, which shows that the polarization characteristics of the fiber laser have no impact on the threshold of MI. Experimental validation of the theoretical analysis is presented with experimental results agreeing well with the theoretical results, in which polarization-maintained and non-polarization-maintained fiber lasers with core/inner cladding diameter of 30/250um and core NA of 0.07 were employed. The MI threshold power is measured to be about 367~386W.
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    • "Power scaling of 1150-1200 nm YDFL can be realized by using specially designed photonic bandgap (PBG) fibers [10], [11]. The highest power achieved by using this fiber is 167 W at 1178 nm [10]. In addition, Raman fiber laser (RFL) can also be used to Vol. 5, No. 5, October 2013 1501706 IEEE Photonics Journal 119-W Monolithic Single-Mode 1173-nm RFL boost the laser power. "
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    ABSTRACT: We report a high-power high-efficiency single-mode all-fiber Raman fiber laser (RFL) operating at 1173 nm. With the core pumped by a 144-W 1120-nm Yb-doped fiber laser, an output power of 119 W at a wavelength of 1173 nm was obtained, corresponding to an optical efficiency of 82%. To the best of our knowledge, it is the highest power at the 1150-1200-nm laser band by using common silica fiber. The optical efficiency of the RFL with high output coupler (OC) reflectivity and short fiber length is discussed. We also carefully measured the output Raman spectrums under different cavity parameters and presented primary analysis. The results show that the bandwidth increases near linearly with laser output power, rather than a square-root law concluded for high Q-value and long-cavity RFLs in previous published literatures. Increasing the length of the gain fiber and the reflectivity of the OC would also broaden the output spectral bandwidth.
    IEEE Photonics Journal 10/2013; 5(5):1501706-1501706. DOI:10.1109/JPHOT.2013.2277071 · 2.21 Impact Factor
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    • "It is clear that the loss profiles measured by 40 m long fibers coiled with D = 32 cm (dot curves in Fig. 7) are not sharp enough to suppress the gain growth at the wavelengths shorter than 1178 nm. Therefore, we coiled the fiber to smaller diameters to fine-tune the short-wavelength cut-off and steepen the loss slope [16] [17] [18] [19] [20]. The fibers coiled with D = 26 cm, the optimal coiling diameter determined experimentally, have loss slopes steeper than the gain and can be free from ASE in the wide spectral region. "
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    ABSTRACT: Yb-doped fiber laser operating at the long-wavelength edge (1150–1200 nm) of the broad gain spectrum has been investigated for yellow-orange sources. Power scaling in this region has been recently achieved by Yb-doped solid-core photonic bandgap fibers, in which the Yb gain profile is engineered by the sharp-cut, bandpass distributed filtering and therefore amplified spontaneous emission in the high-gain region (1030–1100 nm) is strictly inhibited. We have recently demonstrated amplification with as high as 167 W output power and 61% slope efficiency at 1178 nm. The novel gain profiling technique by photonic bandgap fibers can be extended to other rare-earth doped fibers.
    Optical Fiber Technology 12/2010; 16(6-16):449-457. DOI:10.1016/j.yofte.2010.09.003 · 1.30 Impact Factor
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