250 W single-crystal fiber Yb:YAG laser

Délen, Xavier; Piehler, Stefan; Didierjean, Julien; Aubry, Nicolas; Voß, Andreas; Ahmed, Marwan Abdou; Graf, Thomas; Balembois, François; Georges, Patrick

doi:10.1364/ol.37.002898

Cited by 86 publications

(31 citation statements)

References 7 publications

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“…Caird's analysis revealed that a slope efficiency of 55% over the absorbed power could be achieved in optimal conditions, matching the highest results obtained so far [27]. Although the latter configuration did not operate in single-mode regime, similar cane configuration can be employed as a booster amplifier in a MOPA configuration to reach high power while preserving high beam quality [49].…”

Section: Nd-doped Phosphate Fiber Lasers and Amplifierssupporting

confidence: 63%

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

et al. 2017

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Abstract:In recent years, the exploitation of compact laser sources and amplifiers in fiber form has found extensive applications in industrial and scientific fields. The fiber format offers compactness, high beam quality through single-mode regime and excellent heat dissipation, thus leading to high laser reliability and long-term stability. The realization of devices based on this technology requires an active medium with high optical gain over a short length to increase efficiency while mitigating nonlinear optical effects. Multicomponent phosphate glasses meet these requirements thanks to the high solubility of rare-earth ions in their glass matrix, alongside with high emission cross-sections, chemical stability and high optical damage threshold. In this paper, we review recent advances in the field thanks to the combination of highly-doped phosphate glasses and innovative fiber drawing techniques. We also present the main performance achievements and outlook both in continuous wave (CW) and pulsed mode regimes.Keywords: fiber laser and amplifier; phosphate fiber; all-fiber master oscillator power amplifier (MOPA); rare-earth-doped fiber

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Section: Nd-doped Phosphate Fiber Lasers and Amplifierssupporting

confidence: 63%

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

et al. 2017

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“…The gain in the cw regime is close to the gain in the pulsed regime, which confirms the smallness of thermal effects in the AE under study. The gain value is close to that obtained in [2,3,5]. …”

Section: Thin-rod Laser Headssupporting

confidence: 87%

“…A combination of a high efficiency and a high gain, which is comparable with the gain achieved in regenerative amplifiers, is demonstrated. The gain achieved in a laser head with an Yb : YAG thin rod prepared by the method described in [1,4] is close to the gain obtained in [2,3,5]. The amplified output power was 15 W at an optical-to-optical efficiency of 18 %, which corresponds to a pulse energy of 5 mJ at a pulse repetition rate of 3 MHz.…”

Section: Discussionsupporting

confidence: 69%

Yb : YAG thin-rod laser amplifier with a high pulse energy for a fibre oscillator

Kuznetsov¹,

Mukhin²,

Palashov³

2016

Quantum Electron.

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High (more than ten times) small-signal gain is demonstrated in an Yb : YAG single crystal thin rods with pumping by a fibre-coupled diode laser. A four-pass amplifier for a fibre master oscillator with an average output power exceeding 15 W at a pulse repetition rate of 3 MHz is fabricated based on this active element. The small-signal gain in the developed amplifier is 26 dB, which is comparable with the gain in regenerative amplifiers. The possibility of obtaining sub-millijoule pulse energy at a pulse repetition rate of tens of kilohertz is shown.

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“…This concept has recently been successfully implemented in Yb:YAG lasers and demonstrated continuous emission of 250 W from an oscillator based on a 1% doped Yb:YAG SCF pumped by a 600 W laser diode [8]. This clearly shows the potential of this approach for high-power extraction.…”

mentioning

confidence: 90%

Yb:YAG single crystal fiber power amplifier for femtosecond sources

et al. 2013

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We demonstrate a versatile femtosecond power amplifier using a Yb:YAG single crystal fiber operating from 10 kHz to 10 MHz. For a total pump power of 75 W, up to 30 W is generated from the double-pass power amplifier. At a repetition rate of 10 kHz, an output energy of 1 mJ is obtained after recompression. In this configuration, the pulse duration is 380 fs, corresponding to a peak power of 2.2 GW. The M 2 beam quality factor is better than 1.1 for investigated parameters. © 2013 Optical Society of America OCIS codes: 320.7090, 140.3615.Ultrafast lasers are now a common tool for scientific and industrial applications. Over the past decade, many technological developments of diode-pumped solid-state laser systems have allowed tremendous improvements of their performance, reliability, and cost. In order to achieve high energy per pulse in the femtosecond regime, master oscillator power amplifier systems are commonly used. Regenerative amplifiers based on bulk or thin disk Yb-doped crystals can amplify ultrashort pulses to several tens of millijoules [1,2]. They can provide high gain and high output energy at a low repetition rate, but they are limited in terms of repetition rate to a few hundreds of kilohertz due to the high-voltage-driven switch speed. Ytterbium-doped optical fibers can also be used to amplify ultrashort pulses. Their high surface-to-volume ratio provides good thermal management and allows attainment of high average powers of several hundreds of watts [3]. However, the signal confinement in smallcross-section cores induces nonlinear effects, such as self-phase modulation and self-focusing, which limit the peak power and the pulse energy. Femtosecond pulses with an energy of 2.2 mJ were obtained using the well-known chirped pulse amplification technique together with large-core-diameter photonic crystal fibers [4]. Another approach consists in amplifying femtosecond pulses directly in Yb-doped crystals using multipass amplifiers without active elements. Although it requires quite complex systems, the slab geometry has proven to be a very successful approach. Up to 1.1 kW [5] average power and 20 mJ [6] energy were obtained with an Yb:YAG Innoslab amplifier. Significant improvement of the emission cross section and the thermal conductivity can be observed at cryogenic temperatures in most Ybdoped crystals. 40 mJ output energy was obtained using a cryogenic Yb:YAG double-pass amplifier [7]. However, stronger spectral narrowing at low temperatures induces longer optical pulses of several picoseconds. Finally, the single crystal fiber (SCF) concept lies between fibers and crystals and can contribute to original performance for femtosecond systems. SCFs are long, thin crystal rods with a diameter lower than 1 mm and a typical length of a few centimeters.

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250 W single-crystal fiber Yb:YAG laser

Cited by 86 publications

References 7 publications

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

Yb : YAG thin-rod laser amplifier with a high pulse energy for a fibre oscillator

Yb:YAG single crystal fiber power amplifier for femtosecond sources

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