All-Fiber-Integrated Narrowband Nanosecond Pulsed Tm-Doped Fiber MOPA

We present a high average power narrowband-pulsed fiber master oscillator power amplifier (MOPA) at 1.971 μm. The linewidth of the pulse trains is broadened to ~1.5 GHz via phase modulation. The repetition rates are 3 and 5 MHz, respectively. The output power of pulse train with 3 MHz repetition rate is 192 W, and the pulsewidth is 51 ns, corresponding to a peak power of 1.11 kW and a pulse energy of 62 μJ. The output power of pulse train with 5 MHz repetition rate is 209 W, and the pulsewidth is 46 ns, corresponding to a peak power of 0.86 kW and a pulse energy of 42 μJ. Higher output power can be achieved by narrowing the pulsewidth to several nanoseconds. To the best of our knowledge, this is the first demonstration on high-power narrowband nanosecondpulsed MOPA near 2 μm with an average power exceeding 200 W.

[1]  M. Fermann,et al.  230-kW peak power femtosecond pulses from a high power tunable source based on amplification in Tm-doped fiber. , 2005, Optics express.

[2]  Joshua E. Rothenberg,et al.  Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers , 2011 .

[3]  Rongtao Su,et al.  Proposal of interaction length for stimulated Brillouin scattering threshold of nanosecond laser in optical fiber , 2014 .

[4]  Qing Wang,et al.  Kilowatt-peak-power, single-frequency, pulsed fiber laser near 2 μm. , 2011, Optics letters.

[5]  Joshua E. Rothenberg,et al.  Active phase and polarization locking of a 1.4 kW fiber amplifier. , 2010, Optics letters.

[6]  Farzin Amzajerdian,et al.  Single-frequency narrow-linewidth Tm-doped fiber laser using silicate glass fiber. , 2009, Optics letters.

[7]  J. Rothenberg,et al.  Low-phase-noise, single-frequency, single-mode 608 W thulium fiber amplifier. , 2009, Optics letters.

[8]  Qing Wang,et al.  2μm fiber laser sources and their applications , 2011, Optical Engineering + Applications.

[9]  S. Jiang,et al.  Mode-locked 2 mum laser with highly thulium-doped silicate fiber. , 2009, Optics letters.

[10]  B. Samson,et al.  Tm-Doped Fiber Lasers: Fundamentals and Power Scaling , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[11]  Wei Shi,et al.  High power and high energy monolithic single frequency 2 μm nanosecond pulsed fiber laser by using large core Tm-doped germanate fibers: experiment and modeling , 2012 .

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

[13]  Wei Shi,et al.  220 μJ monolithic single-frequency Q-switched fiber laser at 2 μm by using highly Tm-doped germanate fibers. , 2011, Optics letters.

[14]  Cesar Jauregui,et al.  2.4 mJ, 33 W Q-switched Tm-doped fiber laser with near diffraction-limited beam quality. , 2013, Optics letters.

[15]  M Ibsen,et al.  100 kW peak power picosecond thulium-doped fiber amplifier system seeded by a gain-switched diode laser at 2 μm. , 2013, Optics letters.

[16]  Martin Richardson,et al.  1 μJ, sub-500 fs chirped pulse amplification in a Tm-doped fiber system. , 2013, Optics letters.

[17]  Pu Zhou,et al.  Pulse bundles and passive harmonic mode-locked pulses in Tm-doped fiber laser based on nonlinear polarization rotation. , 2014, Optics express.

[18]  Pu Zhou,et al.  105 W ultra-narrowband nanosecond pulsed laser at 2 μm based on monolithic Tm-doped fiber MOPA. , 2015, Optics express.

[19]  Stuart D. Jackson,et al.  10 mJ total output from a gain-switched Tm-doped fibre laser , 2000 .

[20]  Kun Liu,et al.  High average power picosecond pulse and supercontinuum generation from a thulium-doped, all-fiber amplifier. , 2013, Optics letters.

[21]  Wei Lu,et al.  1 kW cw Yb-fiber-amplifier with <0.5GHz linewidth and near-diffraction limited beam-quality for coherent combining application , 2011, LASE.

[22]  R. Beach,et al.  Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power. , 2008, Optics express.

[23]  Xiaohui Li,et al.  High-power passively Q-switched thulium fiber laser with distributed stimulated Brillouin scattering. , 2013, Optics letters.

[24]  Qi Jie Wang,et al.  50-W 2-μm Nanosecond All-Fiber-Based Thulium-Doped Fiber Amplifier , 2014, IEEE Journal of Selected Topics in Quantum Electronics.