High power Yb-doped photonic bandgap fiber oscillator at 1178 nm

Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.
Optics Express (Impact Factor: 3.49). 06/2012; 20(13):14471-6. DOI: 10.1364/OE.20.014471
Source: PubMed


An ytterbium-doped solid-core photonic bandgap fiber oscillator in an all-fiber format is investigated for high power at an extreme long wavelength. The photonic bandgap fiber is spliced with two fiber Bragg gratings to compose the cavity. The sharp-cut bandpass distributed filtering effect of the photonic bandgap fibers efficiently suppresses amplified spontaneous emission in the conventional high-gain region. Fine adjustment of the short cut-off wavelength by coiling with tighter diameter is performed to suppress parasitic lasing. A record output power of 53.6 W with a slope efficiency of 53% at 1178 nm was demonstrated.

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Available from: Ken-ichi Ueda
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    • "Compared with air-hole PBGFs, all-solid PBGFs show a great advantage to make all fiber system. They have been used as the gain medium in fiber lasers, which can suppress the amplified spontaneous emission and parasitic lasing [5], [6], and shape the pulses [7] thanks to the filtering effect of the bandgap. It is also interesting to investigate the role of the high loss region in the supercontinuum (SC) generation. "
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    ABSTRACT: We demonstrate nonlinear propagation of femtosecond laser pulses in an all-solid photonic bandgap fiber. A supercontinuum from 560 to 1470 nm is generated from this fiber with an average power of 2 W. Spectral broadening not only occurs within the first bandgap, where the pump laser lies, but it also emits a phase-matched dispersive wave in a different propagation mode within the adjacent bandgap. Energy transfers across the intergap attenuation region with simultaneous mode conversion in the nonlinear process. The intermodal Cherenkov radiation generated across two bandgaps by the perturbed Raman solitons can enrich the nonlinear process in the all-solid photonic bandgap fiber.
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    • "But by now, the highest power in 1150-1200 nm is still less than 20 W in the case of using common double-cladding Yb-doped fiber. 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]. "
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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.
    Full-text · Article · Oct 2013 · IEEE Photonics Journal
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    ABSTRACT: 1178 nm single-frequency amplification by Yb doped photonic bandgap fiber has been demonstrated. 24.6 W output power and 12 dB gain were obtained without parasitic lasing and also stimulated Brillouin scattering. 1.8 dB suppression of Brillouin gain by an acoustic antiguiding effect has been found in the Yb doped photonic bandgap fiber.
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