CW Single Transverse Mode All-Fiber
Tm³⁺-Doped Silica Fiber Laser¹

E. Z. Song*, W. H. Li, and L. You

College of Power and Energy Engineering, Institute of Marin Engine Electronic Control Technology,
Harbin Engineering University, Harbin 150001, China

*e-mail:songenzhe12@163.com

Received November 7, 2011; in final form, November 8, 2011; published online March 6, 2012

Abstract—The CW 25.6 W output power with a slope efficiency of 30.6% respected to the pump power from
a CW single transverse mode all-fiber Tm³⁺-doped Silica Fiber Laser is reported. The all-fiber laser is made up
by progressively splicing the pigtail fiber, matched FBG fiber and Tm fiber. The reflective FBG and Tm³⁺-doped
fiber end Fresnel reflection build up the laser resonance cavity. Due to the multi-mode FBG as the reflective
mirror, the output laser spectrum is multi-peaks at high output power, but the spectrum width is less than 2 nm
at 1.94 m. We estimate the beam quality to be M² = 2.39, clearly indicating nearly diffraction-limited beam
propagation.

DOI: 10.1134/S1054660X12040202

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