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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

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2016

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Vol. 24, No. 4

223--231

EN

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.

2

High-power pump combiners for Tm-doped fibre lasers

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

Opto-Electronics Review

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2015

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Vol. 23, No. 4

259-264

EN

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.

3

Intracavity polarization control in mode-locked Er-doped fibre lasers using liquid crystals

Nikodem M., Krzempek K., Zygadlo K., Dudzik G., Waz A., Abramski K., Komorowska K.

Opto-Electronics Review

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2014

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Vol. 22, No. 2

113-117

EN

In this paper we present a novel configuration of an NPR mode-locked Er-doped laser. This new optical setup uses voltage controlled LC cells to replace standard retarders (quarter- and half-waveplates) inside the laser cavity. Using this novel, mechanical-adjustment-free setup a mode-locking was obtained with sub-500 fs pulse duration and an average power exceeding 40 mW. Presented results show that using simple LC cells, an optical layout of an NPR mode-locked laser can be greatly simplified.

4

An Efficient Algorithm for Steady State Analysis of Fibre Lasers Operating under Cascade Pumping Scheme

Sujecki S.

International Journal of Electronics and Telecommunications

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2014

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Vol. 60, No. 2

143-149

EN

We derive an efficient algorithm for the steady state analysis of fibre lasers operating under cascade pumping scheme by combining the shooting method with the Newton-Raphson method. We compare the proposed algorithm with the two standard algorithms that have been used so far in the available literature: the relaxation method and the coupled solution method. The results obtained show that the proposed shooting method based algorithm achieves much faster convergence rate at the expense of a moderate increase in the calculation time. It is found that a further improvement in the computational efficiency can be achieved by using few iterations of the relaxation method to calculate the initial guess for the proposed shooting method based algorithm.

5

Phase-locking of 19-core Yb3+ - doped optical fibre

Kochanowicz M., Dorosz D., Zając A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2011

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Vol. 59, nr 4

371-379

EN

The supermode generation in a multicore optical fibre laser can be realised by phase-locking of radiation inside of the fibre. The model proposed by authors implies the achievement of supermode generation by exchanging radiation between the cores during the development of the laser action. The analysis of the impact of coupling value between the cores on phase radiation of particular emitters was considered. In the paper the phase-locking of 19-core optical fibre doped with Yb3+ ions is presented. The analysis of material and geometrical parameters of the active 19 -core optical fibre and phase deviation on the beam quality factor of the laser beam in the far-field diffraction region has been analysed. The beam quality factor of the manufactured multicore fibre equals BQF = 0.71, V = 2.4, d = 18 ěm. As a result of the conducted analysis a double-clad 19 – cores optical fibre doped with ytterbium ions has been designed and fabricated and its luminescence spectra and far-field diffraction pattern have been measured. Registered in the experiment in MOFPA system far-field pattern showed centrally located peak of relatively high radiation intensity together with smaller side-lobes, and as such was similar to the pattern which had been obtained numerically.

6

Fibre lasers - conditioning constructional and technological

Zając A., Dorosz D., Kochanowicz M., Skorczakowski M., Świderski J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2010

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Vol. 58, nr 4

491-502

EN

In this paper the actual level of fiber lasers’ development is presented. There is also presented the analysis of technological and constructional conditions that limit energy parameters of those sources. Authors also show a construction and a technological work, conducted in Poland, which led to improving energy and exploit parameters of fiber lasers.

7

Diode-pumped solid-state lasers

Jankiewicz Z., Kopczyński K.

Opto-Electronics Review

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2001

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Vol. 9, No. 1

19-33

EN

Progress in technology and construction of diode-pumped laser made in the 80's caused renewed intereset in diode pumping of active media of solid-state lasers (DPSSL -Diode Pumped Solid State Laser) and next their rapid development. At present, DPSSL are commonly applied in medicine and industry.The paper presents advantages of such excitation and significant improvement in generation efficiency, longer service life of devices, smaller dimensions of quantum generators and theirs power suppliers. Special attention is paid to the possibility of application of new active media (new neodymium doped hosts), including ytterbium (Yb) doped media, that have perfect functional parameters with diode pumping. Fundamental configurations of active media and their excitation methods are described. A "slab" type geometry used for high-power lasers is distinguished. It is shown that construction of, so-called, microlasers is possible when diodes are used as pumps of solid state lasers. Microlasers can generate strictly monochromatic radiation (i.e.,generate only one longitudinal mode). These lasers can be used for rangefinder transmitters and radars with heterodyne detection - new type devices applicability range of which is difficult to predict. Microlasers can be also used as frequency and length standards. A group of fibre lasers is considered and their unusual possibilities are described, among others generation of beams of high quality (M² ~1) and high-power (1 kW). The examples of construction of high-power DPSSL (3,5 kW) are presented.