Article

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

ABSTRACT 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, Aug 30, 2015
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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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    • "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: 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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