Power Scaling of Single-Frequency Ytterbium-Doped Fiber Master-Oscillator Power-Amplifier Sources up to 500 W

Jeong, Yoonchan; Nilsson, Johan; Sahu, J.K.; Payne, D.N.; Horley, R.; Hickey, L.M.B.; Turner, P.W.

doi:10.1109/jstqe.2007.896639

Cited by 238 publications

(90 citation statements)

References 20 publications

(29 reference statements)

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“…Stimulated Brillouin scattering (SBS), a nonlinear effect, is a key limitation for highpower fiber amplifiers with the coherence required for synthetic aperture lasers. SBS has been successfully addressed in recent years, to enable power-scaling to the kilowatt-level of Yb-doped fiber MOPAs (e.g., [5]). One possibility is to rely on the longitudinal temperature variation that is generated in REdoped fibers at high powers [5], [6].…”

Section: Single-frequency Fiber Mopas and Synthetic-aperture Lasersmentioning

confidence: 99%

“…SBS has been successfully addressed in recent years, to enable power-scaling to the kilowatt-level of Yb-doped fiber MOPAs (e.g., [5]). One possibility is to rely on the longitudinal temperature variation that is generated in REdoped fibers at high powers [5], [6]. These can reach 100 K or more.…”

Section: Single-frequency Fiber Mopas and Synthetic-aperture Lasersmentioning

confidence: 99%

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Fiber MOPAs with high control and high power

Nilsson

Yoo

Dupriez

et al. 2008

Asia Optical Fiber Communication and Optoelectronic Exposition and Conference

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High power fiber sources have reached several kilowatts of output power, and are now leading contenders for many applications. Important attractions include control, efficiency, manufacturability, and reliability. We will exemplify opportunities and limitations for these revolutionary sources. IntroductionHigh power fiber sources are now leading contenders for many important applications requiring powers from a few watts up to several kilowatts. Beyond raw power, fibers offer advantages such as control, efficiency, manufacturability, and reliability. These derive from the fundamental fiber geometry, as well as advances in fiber design, fabrication, and pump diodes, largely driven by the optical communications industry. Master oscillator -power amplifier (MOPA) configurations build on the unique combination of high power, high efficiency, high gain, and broad gain bandwidth of rare-earth (RE) doped fibers. In MOPAs, the output from highly controlled, low power seed lasers can be amplified to ultrahigh power levels whilst preserving the desired seed characteristics. High control is much simpler at low powers. For example, high-speed lithium niobate modulators can be used to control the amplitude as well as the phase of the seed light. This makes MOPAs revolutionary light sources that can enable and dominate a range of devices and application areas. At the same time, the fiber MOPAs are being pushed ever closer to their physical limits. Here, we will exemplify both opportunities and limits of high-power fiber MOPAs. Fiber Raman amplifier with controllable gain spectrum Raman amplifiers offer the potential to generate gain at any arbitrary wavelength over several Stokes orders with an appropriate pump source. This has proved a very effective and successful way of providing gain at wavelengths not directly available with RE-doped fibers. Most of this success has been achieved using CW pump diodes, but in recent years there has been renewed interest in pulsed pumping of Raman amplifiers. This has been mainly in the telecommunications area through time-division multiplexed pumping schemes [1], but also in other areas due to advances in diode-seeded high power fiber MOPA systems [2]. A MOPA allows for excellent control of the pulse parameters which is not easily available from Q-switched or mode-locked lasers. This opens up new opportunities for controlling the Raman gain spectrum through control of the pulse parameters. We have experimentally investigated this, by pumping a fiber Raman amplifier with step-shaped optical pulses delivered from an ytterbium (Yb) doped fiber MOPA [3], [4]. With the instantaneous power of each step appropriately tailored, different parts of the pulse transfer their energy to different Stokes orders, leading to a controllable gain spectrum covering multiple Stokes orders. This opens up opportunities for an ultra-broadband Raman amplifier with near-instantaneous electronic control of the gain spectrum.

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Section: Single-frequency Fiber Mopas and Synthetic-aperture Lasersmentioning

confidence: 99%

Section: Single-frequency Fiber Mopas and Synthetic-aperture Lasersmentioning

confidence: 99%

Fiber MOPAs with high control and high power

Nilsson

Yoo

Dupriez

et al. 2008

Asia Optical Fiber Communication and Optoelectronic Exposition and Conference

View full text Add to dashboard Cite

show abstract

“…They also possess a broad range of attractive physical attributes, functionality and practicality that distinguish them from other bulky solid-state counterparts, including single longitudinal mode (also known as single frequency) [3,4], broad gain bandwidth [5], high power efficiency (>80%) [6,7], outstanding thermo-optical properties and fully alignment-free design. Excellent performance characteristics of continuous wave (CW), nanosecond (ns), picosecond (ps) and femtosecond (fs) YDFLs have been intensively demonstrated so far [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Compact fs ytterbium fiber laser at 1010 nm for biomedical applications

Kong

Pilger

Hachmeister

et al. 2017

Biomed. Opt. Express

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Ytterbium-doped fiber lasers (YDFLs) working in the near-infrared (NIR) spectral window and capable of high-power operation are popular in recent years. They have been broadly used in a variety of scientific and industrial research areas, including light bullet generation, optical frequency comb formation, materials fabrication, free-space laser communication, and biomedical diagnostics as well. The growing interest in YDFLs has also been cultivated for the generation of high-power femtosecond (fs) pulses. Unfortunately, the operating wavelengths of fs YDFLs have mostly been confined to two spectral bands, i.e., 970-980 nm through the three-level energy transition and 1030-1100 nm through the quasi three-level energy transition, leading to a spectral gap (990-1020 nm) in between, which is attributed to an intrinsically weak gain in this wavelength range. Here we demonstrate a highpower mode-locked fs YDFL operating at 1010 nm, which is accomplished in a compact and cost-effective package. It exhibits superior performance in terms of both short-term and longterm stability, i.e., <0.3% (peak intensity over 2.4 μs) and <4.0% (average power over 24 hours), respectively. To illustrate the practical applications, it is subsequently employed as a versatile fs laser for high-quality nonlinear imaging of biological samples, including twophoton excited fluorescence microscopy of mouse kidney and brain sections, as well as polarization-sensitive second-harmonic generation microscopy of potato starch granules and mouse tail muscle. It is anticipated that these efforts will largely extend the capability of fs YDFLs which is continuously tunable over 970-1100 nm wavelength range for wideband hyperspectral operations, serving as a promising complement to the gold-standard Ti:sapphire fs lasers.

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“…The use of metal coatings on cladding pumped active fibres was first proposed by Jeong et al as a route to improved stimulated Brillouin scattering (SBS) suppression in microstructured fibres through an increased thermal gradient [8]. This was proposed in the context of air jacketed microstructured fibres where the requirement of light guiding polymer coatings does not exist, however such designs have presented challenges in the multi-kW single mode regime.…”

Section: Introductionmentioning

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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Power Scaling of Single-Frequency Ytterbium-Doped Fiber Master-Oscillator Power-Amplifier Sources up to 500 W

Cited by 238 publications

References 20 publications

Fiber MOPAs with high control and high power

Fiber MOPAs with high control and high power

Compact fs ytterbium fiber laser at 1010 nm for biomedical applications

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

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