High-power disk and fiber lasers: a performance comparison

Ruppik, Stefan; Becker, Frank; Grundmann, Frank-Peter; Rath, Wolfram; Hefter, U.

doi:10.1117/12.913286

Cited by 19 publications

(10 citation statements)

References 13 publications

(13 reference statements)

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“…reported a solid-state laser with a 200µm power delivery fiber which provides output NA of 0.1, and also a fiber laser with 50 or 100µm power delivery fiber which provides output NA of ~0.08 [6]. Langner et al reported a very large-mode-area fiber laser with 5 mm*mrad BPP, which is then free-space coupled to 200µm power delivery fiber and the output NA is 0.065 [7].…”

Section: Ligft Sourcementioning

confidence: 97%

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Mode coupling in large-diameter multi-mode silica optical fibers

Ye¹,

Koponen²,

Aallos³

et al. 2013

Fiber Lasers X: Technology, Systems, and Applications

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We report an experimental study on mode coupling in various large-diameter multi-mode silica optical fibers. The evolution of the far-field angular power distribution is experimentally measured, and the mode coupling characteristics are studied on a variety of fibers with diverse parameters, including core/cladding diameter (50-400µm/125-480µm), length (few to hundreds of meters), NA (0.15-0.46), etc. The influences of fiber geometry, bending are discussed. This study could provide practical guidance in designing power delivery fibers for high-power diode, solid-state and fiber lasers to preserve the input brightness and beam quality.

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Section: Ligft Sourcementioning

confidence: 97%

“…Computer Power meter 2) Power delivery fiber of MM solid-state/fiber lasers For high power applications, such as cutting and welding, laser power of few hundreds to KWs and brightness with beam propagation parameter (BPP) of 2-10mm*mrad is often used [6].…”

Section: Ligft Sourcementioning

confidence: 99%

Mode coupling in large-diameter multi-mode silica optical fibers

Ye¹,

Koponen²,

Aallos³

et al. 2013

Fiber Lasers X: Technology, Systems, and Applications

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“…In this way it is easy to generate laser radiation with diffraction limited beam quality. The principle of the double clad fiber is often used to enable the use of inexpensive diode lasers with relatively poor beam quality for optical pumping 1 . With this method, the pump radiation is conducted in an own, larger fiber core, which is arranged concentrically around the actual laser core.…”

Section: Dual Side Pumped Fiber Laser Oscillatormentioning

confidence: 99%

Multi-kW cw fiber oscillator pumped by wavelength stabilized fiber coupled diode lasers

Becker¹,

Neumann²,

Winkelmann³

et al. 2013

Fiber Lasers X: Technology, Systems, and Applications

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High power Yb doped fiber laser sources are beside CO 2 -and disk lasers one of the working horses of industrial laser applications. Due to their inherently given robustness, scalability and high efficiency, fiber laser sources are best suited to fulfill the requirements of modern industrial laser applications in terms of power and beam quality.Pumping Yb doped single-mode fiber lasers at 976nm is very efficient. Thus, high power levels can be realized avoiding limiting nonlinear effects like SRS. However the absorption band of Yb doped glass around 976nm is very narrow. Therefore, one has to consider the wavelength shift of the diode lasers used for pumping.The output spectrum of passively cooled diode lasers is mainly defined by the applied current and by the heat sink temperature. Furthermore the overall emission line width of a high power pump source is dominated by the large number of needed diode laser emitters, each producing an individual spectrum.Even though it is possible to operate multi-kW cw single-mode fiber lasers with free running diode laser pumps, wavelength stabilizing techniques for diode lasers (e.g. volume holographic gratings, VHG) can be utilized in future fiber laser sources to increase the output power level while keeping the energy consumption constant.To clarify the benefits of wavelength stabilized diode lasers with integrated VHG for wavelength locking the performance of a dual side pumped fiber oscillator is discussed in this article. For comparison, different pumping configurations consisting of stabilized and free-running diode lasers are presented.

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“…[1,2]. In recent years, due to the rapid development of large mode area (LMA) fiber, several research groups have accomplished output power of up to kilowatt level in the continuous-wave (CW) regime [3][4][5][6][7][8][9]. In fact, the majority of these reported high-power fiber lasers belong to a category of randomly polarized lasers.…”

Section: Introductionmentioning

confidence: 99%

15 kW ytterbium-doped single-transverse-mode, linearly polarized monolithic fiber master oscillator power amplifier

Huang

Tao

et al. 2015

Appl. Opt.

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A linearly polarized monolithic fiber laser based on a master oscillator power amplifier structure with a master oscillator and a one-stage power amplifier is reported. We design a homemade oscillator based on the theory that, in the coiled gain fiber, the higher modes and the polarized mode of the fundamental mode along the fast axis are suppressed effectively because of their obviously higher bend loss than that of the polarized mode of the fundamental mode along the slow axis. The oscillator operates at 1080 nm, launching a 30 W seed laser with a high polarization extinction ratio of 19 dB into the power amplifier via a mode field adapter. The power amplifier utilizes Yb-doped polarization-maintaining fiber of 20/400 μm, which produces nearly diffraction-limited output power of about 1.5 kW with an optical-optical efficiency of 81.5% and a polarization extinction ratio of 13.8 dB. Both the M(x)² factor and the M(y)² factor of the collimated beam are measured to be about 1.2. The spectral width of the output power is broadened approximately linearly, and the full width at half maximum of the spectrum at the maximum output power is about 5.8 nm. It is known as the highest linearly polarized output power to the best of our knowledge.

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High-power disk and fiber lasers: a performance comparison

Cited by 19 publications

References 13 publications

Mode coupling in large-diameter multi-mode silica optical fibers

Mode coupling in large-diameter multi-mode silica optical fibers

Multi-kW cw fiber oscillator pumped by wavelength stabilized fiber coupled diode lasers

15 kW ytterbium-doped single-transverse-mode, linearly polarized monolithic fiber master oscillator power amplifier

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