Random distributed feedback fiber laser at 2.1  μm.

We demonstrate a random distributed feedback fiber laser at 2.1 μm. A high-power pulsed Tm-doped fiber laser operating at 1.94 μm with a temporal duty ratio of 30% was employed as a pump laser to increase the equivalent incident pump power. A piece of 150 m highly GeO2-doped silica fiber that provides a strong Raman gain and random distributed feedbacks was used to act as the gain medium. The maximum output power reached 0.5 W with the optical efficiency of 9%, which could be further improved by more pump power and optimized fiber length. To the best of our knowledge, this is the first demonstration of random distributed feedback fiber laser at 2 μm band based on Raman gain.

[1]  Sergei K. Turitsyn,et al.  Random distributed feedback fiber laser , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[2]  V. B. Neustruev,et al.  Raman fibre lasers emitting at a wavelength above 2 μm , 2004 .

[3]  E. I. Dontsova,et al.  Random fiber laser directly pumped by a high-power laser diode. , 2013, Optics letters.

[4]  Y. Rao,et al.  Third-order random lasing via Raman gain and Rayleigh feedback within a half-open cavity. , 2013, Optics express.

[5]  Sergei K Turitsyn,et al.  Cascaded random distributed feedback Raman fiber laser operating at 1.2 μm. , 2011, Optics express.

[6]  M. Melkumov,et al.  Narrowband random lasing in a Bismuth-doped active fiber , 2016, Scientific Reports.

[7]  Lei Zhang,et al.  Ultra-wide wavelength tuning of a cascaded Raman random fiber laser. , 2016, Optics letters.

[8]  Z N Wang,et al.  Random fiber laser formed by mixing dispersion compensated fiber and single mode fiber. , 2013, Optics express.

[9]  John Haub,et al.  A cladding-pumped, tunable holmium doped fiber laser. , 2013, Optics express.

[10]  Yunjiang Rao,et al.  Recent advances in fundamentals and applications of random fiber lasers , 2015 .

[11]  Lei Zhang,et al.  Silica-based fiber Raman laser at > 2.4  μm. , 2015, Optics letters.

[12]  Pu Wang,et al.  High-power operation of silica-based Raman fiber amplifier at 2147 nm. , 2014, Optics express.

[13]  Xiaojun Xu,et al.  Hundred-watt-level high power random distributed feedback Raman fiber laser at 1150 nm and its application in mid-infrared laser generation. , 2015, Optics express.

[14]  E. Dianov,et al.  High-efficiency cascaded Raman fiber laser with random distributed feedback. , 2014, Optics express.

[15]  H. Zhang,et al.  Efficient Raman fiber laser based on random Rayleigh distributed feedback with record high power , 2014 .

[16]  Yunjiang Rao,et al.  High Power Random Fiber Laser With Short Cavity Length: Theoretical and Experimental Investigations , 2015, IEEE Journal of Selected Topics in Quantum Electronics.

[17]  Ke Yin,et al.  Over an octave cascaded Raman scattering in short highly germanium-doped silica fiber. , 2013, Optics express.

[18]  Zejin Liu,et al.  Short cavity-length random fiber laser with record power and ultrahigh efficiency. , 2016, Optics letters.

[19]  M Ibsen,et al.  Ultra-short wavelength operation of a thulium fibre laser in the 1660-1750 nm wavelength band. , 2015, Optics express.

[20]  S. Jackson.  Towards high-power mid-infrared emission from a fibre laser , 2012, Nature Photonics.

[21]  Qing Wang,et al.  Development of Eye-Safe Fiber Lasers Near 2 μm , 2014, IEEE Journal of Selected Topics in Quantum Electronics.