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Picosecond mode-locked tm-doped fibre laser and amplifier system providing over 20 W of average output power at 1994 nm

Grześ P., Michalska M., Świderski J.

Metrology and Measurement Systems

2018

Vol. 25, nr 4

649--658

A mode-locked Tm3+-doped fibre laser and amplifier operating at a central wavelength of 1994.3 nm is demonstrated. A thulium oscillator is passively mode-locked by a semiconductor saturable absorber mirror to generate an average power of 17 mW at a fundamental repetition rate of 81 MHz in a short linear cavity. This 2-μm laser train is amplified to an average power to 20.26 W by two double-clad thulium-doped all-fibre amplifiers. The pulse energy, duration and peak power is 250 nJ, 23 ps and 9.57 kW, respectively. This represents one of the highest values of average power at ~2-μm-wavelength for picosecond thulium-doped fibre lasers and amplifiers. The performance of the laser system is described in details.

Thulium-doped fibre broadband source for spectral region near 2 micrometers

Písařík M., Peterka P., Aubrecht J., Cajzl J., Benda A., Mareš D., Todorov F., Podrazký O., Honzátko P., Kašík I.

Opto-Electronics Review

2016

Vol. 24, No. 4

223--231

We demonstrated two methods of increasing the bandwidth of a broadband light source based on amplified spontaneous emission in thulium-doped fibres. Firstly, we have shown by means of a comprehensive numerical model that the full-width at half maximum of the thulium-doped fibre based broadband source can be more than doubled by using specially tailored spectral filter placed in front of the mirror in a double-pass configuration of the amplified spontaneous emission source. The broadening can be achieved with only a small expense of the output power. Secondly, we report results of the experimental thulium-doped fibre broadband source, including fibre characteristics and performance of the thulium-doped fibre in a ring laser setup. The spectrum broadening was achieved by balancing the backward amplified spontaneous emission with back-reflected forward emission.

High-power pump combiners for Tm-doped fibre lasers

Stachowiak D., Kaczmarek P., Abramski K. M.

Opto-Electronics Review

2015

Vol. 23, No. 4

259-264

In this paper our results of investigation on a pump power combiner in a configuration of 7×1 are presented. The performed combiner, with pump power of 80–85% transmission level, was successfully applied in a thulium doped fibre laser. The performed all-fibre laser setup reached a total CW output power of 6.42 W, achieving the efficiency on a 32.1% level.