Pulsed operation of Tm-doped fiber lasers using piezoelectric-driven microbend applied to elliptical coating fibers

H. Sakata; K. Kimpara; K. Komori; M. Tomiki

doi:10.1117/12.2053702

1 May 2014 Pulsed operation of Tm-doped fiber lasers using piezoelectric-driven microbend applied to elliptical coating fibers

H. Sakata, K. Kimpara, K. Komori, M. Tomiki

Author Affiliations +

Proceedings Volume 9135, Laser Sources and Applications II; 91350P (2014) https://doi.org/10.1117/12.2053702
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

We report Q-switched pulse generation in Tm-doped fiber lasers by introducing piezoelectric-driven microbend into an elliptical coating fiber in a fiber ring resonator. Compared with the untreated circular fiber having a diameter of 240 μm, the elliptical coating fiber was flattened to have a major axis diameter of about 300 μm. We employed a pair of comblike plates attached on the piezoelectric actuators in order to bend the fiber from both sides. The output pulse power is improved by optimizing the tooth-width and spatial period of the comb-like plates, so that the elliptical coating fiber is easily bent and the propagation mode is efficiently coupled to radiation modes around λ = 1.9 μm. The Tm-doped fiber is pumped by a laser diode emitting at 1.63 μm and the pump light is introduced to the fiber ring resonator via the wavelength division multiplexing coupler. The emission spectra showed that the center oscillation wavelength was typically 1.92 μm. When the pump power was increased to 156 mW, the output pulse showed a peak power of 42.5 W with a pulse width of 1.06 μs. We expect that the in-fiber Q-switching technique will provide simple laser systems for environmental sensing and medical applications.

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H. Sakata, K. Kimpara, K. Komori, and M. Tomiki "Pulsed operation of Tm-doped fiber lasers using piezoelectric-driven microbend applied to elliptical coating fibers", Proc. SPIE 9135, Laser Sources and Applications II, 91350P (1 May 2014); https://doi.org/10.1117/12.2053702

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KEYWORDS

Coating

Fiber lasers

Fiber coatings

Resonators

Wavelength division multiplexing

Teeth

Protactinium

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