Efficient, polarised, gain-switched operation of a Tm-doped fibre laser

Simakov, Nikita; Hemming, Alexander; Bennetts, Shayne; Haub, John

doi:10.1364/oe.19.014949

Cited by 70 publications

(42 citation statements)

References 5 publications

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“…The nominal pump absorption in the core of a doped fiber is typically more than 100 dB/m. This means that in core-pumping the fiber can be short (centimeters), but when the pump power exceeds tens of Watts problems with heat dissipation occurs [11]. To get around the problem of power scaling the cladding-pumping geometry can be used.…”

Section: Introductionmentioning

confidence: 99%

The all-fiber cladding-pumped Yb-doped gain-switched laser

Larsen¹,

Hansen²,

Mattsson³

et al. 2014

Opt. Express

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Abstract:Gain-switching is an alternative pulsing technique of fiber lasers, which is power scalable and has a low complexity. From a linear stability analysis of rate equations the relaxation oscillation period is derived and from it, the pulse duration is defined. Good agreement between the measured pulse duration and the theoretical prediction is found over a wide range of parameters. In particular we investigate the influence of an often present length of passive fiber in the cavity and show that it introduces a finite minimum in the achievable pulse duration. This minimum pulse duration is shown to occur at longer active fibers length with increased passive length of fiber in the cavity. The peak power is observed to depend linearly on the absorbed pump power and be independent of the passive fiber length. Given these conclusions, the pulse energy, duration, and peak power can be estimated with good precision.

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Section: Introductionmentioning

confidence: 99%

The all-fiber cladding-pumped Yb-doped gain-switched laser

Larsen¹,

Hansen²,

Mattsson³

et al. 2014

Opt. Express

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“…The only experimental examples of pulsed resonant pumping we are aware of involve pulsed pumping of Holmium [26,27] or Thulium [28][29][30] gain-switched fiber lasers (1940 nm) in order to regulate the usually chaotic pulse generation, and the average powers have been at the <8 W level.…”

Section: Discussionmentioning

confidence: 99%

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Malinowski

Price

Zervas³

2015

IEEE J. Quantum Electron.

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Abstract-We propose a new tandem pumping scheme in threelevel rare-earth doped optical fibers where energy storage in a pump fiber laser enables much shorter (~500 ns) pump pulses than is possible with pulsed diode laser pumping. This has the effect of reducing the time during which the final amplifier has high inversion and hence reduces the ASE when compared to continuous wave (c.w.) tandem pumping. We simulate the gain and ASE dynamics in a pulse-pumped Yb-doped fiber amplifier and show that the ratio of amplified signal to ASE background can be improved by up to 2 orders of magnitude over a large range of pulse energies compared to c.w. tandem pumping. Sub-microsecond pulsed tandem pumping offers a relatively straightforward, as yet experimentally untried, way to substantially reduce undesirable ASE compared to the levels in diode-pumped fiber amplifiers.

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“…On the other hand, in nanosecond regime, several technical difficulties influence the scaling-up of the average power, although the acquired pulse energy increased rapidly to more than 10 mJ with the assistant of bulk and non-waveguide components [7], [8]. The maximum average powers to date are 33 W from a bulk-component-assisted TDFL [9] and only around 10 W from all-fiber TDFLs [10], [11]. The primary restrictions are the heat issue related to low slope efficiency of thulium-doped fiber amplifiers (TDFAs) at kilohertz repetition rate, detrimental nonlinear effects at high peak power, optical damage of silica fiber, and immaturity of high-power fiber components at 2-µm.…”

Section: Introductionmentioning

confidence: 99%

High-Power Highly Linear-Polarized Nanosecond All-Fiber MOPA at 2040 nm

Yang

Wang

Zhang

et al. 2015

IEEE Photon. Technol. Lett.

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We demonstrate a nanosecond all-fiber MOPA with linear-polarized output at 2040 nm, seeded by an in-bandpumped gain-switched thulium-doped fiber laser, which can directly output tens-of-microjoules pulses with designable pulse duration and Gaussian-like pulse profile. After only two stages of amplification, we achieve an average power of 70 W at a pulse width of 114 ns and a repetition rate of 10 kHz, corresponding to a pulse energy of 7 mJ and a peak power of 53.8 kW. Benefit from the on-site polarization control technique we proposed, a polarization extinction ratio (PER) of 25 dB at the highest output is also obtained. To the best of our knowledge, this is the highest power nanosecond all-fiber laser reported at 2-µm waveband and the PER is also a record among high-power fiber lasers.

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Efficient, polarised, gain-switched operation of a Tm-doped fibre laser

Cited by 70 publications

References 5 publications

The all-fiber cladding-pumped Yb-doped gain-switched laser

The all-fiber cladding-pumped Yb-doped gain-switched laser

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

High-Power Highly Linear-Polarized Nanosecond All-Fiber MOPA at 2040 nm

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