Power scaling of high-power fiber lasers for micromachining and materials processing applications

Norman, Stephen; Zervas, M.N.; Appleyard, Andrew; Skull, P.; Walker, Donald G.; Turner, P.W.; Crowe, Ian

doi:10.1117/12.645527

Cited by 21 publications

(8 citation statements)

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“…The output powers of Yb-doped DC fiber lasers have steadily increased over the past few years, rising to well over 1 kW average power in the cw mode and exceeding 1 MW peak power in the pulsed mode [2][3][4][5][6]. In the past few years, numerous fiber lasers and amplifiers with various output characteristics have already been successfully transitioned from laboratory prototypes to commercially available devices [7,8].…”

Section: Introductionmentioning

confidence: 99%

Photodarkening rate in Yb-doped silica fibers

Koponen¹,

Söderlund²,

Hoffman³

et al. 2008

Appl. Opt.

103

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Yb-doped fibers are widely used in laser applications requiring high average output powers and high-peak-power pulse amplification. Photodarkening (PD) is recognized as one limiting factor in these fibers when pumped with high-intensity radiation. We describe an approach for performing quantitative PD studies of fibers, and we present measurements of the rate of PD in Yb-doped single-mode fibers with varying inversion levels. The method is applicable to large-mode-area fibers. We observed a seventh-order dependence of the PD rate on the excited-state Yb concentration for two different fibers; this result implies that PD of a Yb-doped fiber source fabricated using a particular fiber will be strongly dependent on the configuration of the device.

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Section: Introductionmentioning

confidence: 99%

Photodarkening rate in Yb-doped silica fibers

Koponen¹,

Söderlund²,

Hoffman³

et al. 2008

Appl. Opt.

103

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“…Figure 1a,c represents the side-pumping scheme, where, in both cases, the outer clad needs to be grinded down. In the distributed side coupling scheme ( Figure 1a) the pump fiber is fused to an active DC fiber on a long section allowing for pumping the active fiber in forward and backward direction simultaneously [19,20]. The scheme presented in Figure 1c represents conventional side-pumping method in an all-fiber construction approach [21][22][23].…”

Section: Passive Fiber Components-power Combiners and Mode Field Adapmentioning

confidence: 99%

High-Power Passive Fiber Components for All-Fiber Lasers and Amplifiers Application—Design and Fabrication

Stachowiak

2018

Photonics

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The most important components for application in high-power all-fiber lasers and amplifiers are, most of all, power combiners, but also mode field adaptors. This paper summarizes recent achievements in the area of development and fabrication of high-power passive fiber components. The principles of operation and basic design and fabrication criteria, which have to be taken into account while designing the aforementioned components, are explained in detail. The most recent impressive achievements are summarized and described.

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“…That is, the long cylindrical length with small cross-sectional area maximizes the surface area to volume ratio which enables rapid heat extraction. Furthermore, recent progress toward increasing the mode area and reducing the length of quasi-singlemode fiber amplifiers is enabling new benchmarks in pulse energy from all-fiber laser systems [12] .…”

Section: Amplifier Performancementioning

confidence: 99%

Pulse and amplifier dynamics in high energy fiber optic ultrashort pulse laser systems

et al. 2009

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Ultrashort pulse lasers based on fiber optic architecture will play a dominant role in the spread of these lasers into research and industrial applications. The principle challenge is to generate adequate pulse energy from singlemode or quasi-singlemode amplifiers which have small cross-sectional area. We demonstrate a robust, all-fiber erbium amplifier system that produces >100 μJ per pulse with 701 fs pulsewidth and M 2 < 1.3. We will discuss the salient amplifier dynamics that influence the pulse generation, shaping, and propagation phenomena in state-of-the-art erbium fiber lasers. Furthermore, we show data relevant to applications and implementation of ultrashort pulse lasers.

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Power scaling of high-power fiber lasers for micromachining and materials processing applications

Cited by 21 publications

References 0 publications

Photodarkening rate in Yb-doped silica fibers

Photodarkening rate in Yb-doped silica fibers

High-Power Passive Fiber Components for All-Fiber Lasers and Amplifiers Application—Design and Fabrication

Pulse and amplifier dynamics in high energy fiber optic ultrashort pulse laser systems

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