152  W average power Tm-doped fiber CPA system

Stutzki, Fabian; Gaida, Christian; Gebhardt, Martin; Jansen, Florian; Wienke, Andreas; Zeitner, Uwe D.; Fuchs, F.; Jáuregui, César; Wandt, Dieter; Kracht, Dietmar; Limpert, Jens; Tünnermann, Andreas

doi:10.1364/ol.39.004671

Cited by 92 publications

(37 citation statements)

References 17 publications

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“…For example, Thulium has shown a far greater sensitivity to operating temperature and heat removal, with the authors from [30] noting a 1.6 times increase in laser slope efficiency when improved cooling was used. Finally soft glass laser systems such as Er:ZBLAN with their low thermal conductivity, high thermal load and low melting point are an ideal candidate for metal coated fibre designs.…”

Section: Discussionmentioning

confidence: 99%

Metal clad active fibres for power scaling and thermal management at kW power levels

Daniel¹,

Simakov²,

Hemming³

et al. 2016

Opt. Express

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We present a new approach to high power fibre laser design, consisting of a polymer-free all-glass optical fibre waveguide directly overclad with a high thermal conductivity metal coating. This metal clad active fibre allows a significant reduction in thermal resistance between the active fibre and the laser heat-sink as well as a significant increase in the operating temperature range. In this paper we show the results of a detailed thermal analysis of both polymer and metal coated active fibres under thermal loads typical of kW fibre laser systems. Through several different experiments we present the first demonstration of a cladding pumped aluminium-coated fibre laser and the first demonstration of efficient operation of a cladding-pumped fibre laser at temperatures of greater than 400 °C. Finally, we highlight the versatility of this approach through operation of a passively (radiatively) cooled ytterbium fibre laser head at an output power of 405 W in a compact and ultralight package weighing less than 100 g.

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Section: Discussionmentioning

confidence: 99%

Metal clad active fibres for power scaling and thermal management at kW power levels

Daniel¹,

Simakov²,

Hemming³

et al. 2016

Opt. Express

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“…It has been achieved from the TDFLs an average power of 1 kW from a CW laser [3], and a peak power of > 4 MW from an ultra-short pulsed laser [4]. With the help of high repetition rate (> 10 MHz), high average power picosecond [5] and femtosecond [6] TDFLs have been realized to around a hundred watts.…”

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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“…It has been reported an average power of 1 kW output from the TDFLs in the continuous wave regime [2]. Picosecond and femtosecond fiber laser have been realized to around a hundred watts with the help of high repetition rate [3][4]. In addition, high power 2 μm nanosecond pulses have been generated through Q-switching or gain switching method adopting MOPA configuration.…”

Section: Introductionmentioning

confidence: 99%

160 W average power single-polarization, nanosecond pulses generation from diode-seeded thulium-doped all fiber MOPA system

Shi

Liu

et al. 2015

SPIE Proceedings

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We demonstrate high average power all-fiber single-polarization thulium(Tm)-doped nanosecond laser based on all-fiber master-oscillator power-amplifier (MOPA).The seed source employed is a directly modulated discrete-mode (DM) diode at 2 μm with pulse width of 15.8 ns and tunable repetition rate range of 400 kHz to 4 MHz. The pulse duration reduced to 6 ns as the gain reshaping during amplification. The MOPA yields 160 W maximum average powers at 4 MHz repetition with 6 ns pulse width, with respect to pulse energy of 40 μJ and peak-power of 6.7 kW. The slope efficiency for the last stage of PM LMA Tm-doped fiber amplifier was 48.8% with respect to launched pump power. The polarization extinction ratio (PER) of system measured at maximum output power is beyond 15 dB. The beam quality factor M 2 was measured to be 1.5 at average output power of 160 W. To the best of our knowledge, this is the highest average power 2 μm nanosecond pulses laser from laser diode seeded all-fiber MOPA systems to date.

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152 W average power Tm-doped fiber CPA system

Cited by 92 publications

References 17 publications

Metal clad active fibres for power scaling and thermal management at kW power levels

Metal clad active fibres for power scaling and thermal management at kW power levels

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

160 W average power single-polarization, nanosecond pulses generation from diode-seeded thulium-doped all fiber MOPA system

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