11.2 dB SBS gain suppression in a large mode area Yb-doped optical fiber

Mermelstein, Marc D.; Andrejco, M. J.; Fini, John M.; Yablon, A.D.; Headley, C.; DiGiovanni, D. J.; McCurdy, A.H.

doi:10.1117/12.770346

Cited by 53 publications

(26 citation statements)

References 8 publications

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“…Several different methods have been implemented to limit the SBS in silica-based fiber lasers [64][65][66]. The use of phosphate glass-based optical fiber represents an alternative option to overcome this limitation.…”

Section: Cw Single-frequency Phosphate Fiber Lasers and Amplifiersmentioning

confidence: 99%

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: Cw Single-frequency Phosphate Fiber Lasers and Amplifiersmentioning

confidence: 99%

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

et al. 2017

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“…Numerical calculations confirm this, with a high accuracy, in the case of an anti- guiding acoustic refractive index profile. The Brillouin gain suppression is ~13 dB, which is larger than the 11.2 dB reported with triangular antiguiding acoustic refractive index profiles [10], but perhaps not significantly so. If the acoustic refractive index profile is inverted, to form an acoustic waveguide, acoustic modes appear that lead to spikes in the Brillouin gain spectrum.…”

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

confidence: 56%

“…Another possibility is to use a transversally varying speed for the acoustic wave involved in the Brillouin interaction, e.g., with varying germanium and aluminum concentrations across the core [7], [8], [9], [10]. This way, it is possible to independently control propagation of the acoustic and optical waves, and an acoustic speed variation as large as 9% has been achieved [10]. The resulting SBS suppression is sometimes explained in terms of a reduced overlap with (guided) acoustic modes [9].…”

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

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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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“…A number of techniques have been employed or suggested for the purpose of mitigating SBS in optical fibers including large flattened mode (LMA) fibers [1], thermal gradients [2], and various manipulations of the acoustic properties of the core or cladding regions of the fiber [3,4]. Another promising technique that can be used in conjunction with the aforementioned methods, involves the simultaneous illumination of the fiber by two seed lasers oscillating at two different frequencies (wavelengths).…”

Section: Introductionmentioning

confidence: 99%

SBS mitigation with multi-tone amplification: a theoretical model

et al. 2008

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Two approaches to two-and three-tone seeding of high power ytterbium-doped fiber amplifiers are investigated using a symbolic and numerical code that solves a two point boundary problem consisting of a 12x12 system of nonlinear differential equations. Optimization of amplifier action is considered in relation to the two most dominant nonlinear effects: stimulated Brillouin scattering and four-wave mixing. One approach uses a large wavelength separation among the input seed beams, while in the other approach the seeds are separated by precisely twice the Brillouin shift. It is found that for both techniques significant increase in amplifier output can be obtained, although for the latter case a substantial amount of power is generated in the four-wave mixing sidebands.

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11.2 dB SBS gain suppression in a large mode area Yb-doped optical fiber

Cited by 53 publications

References 8 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

Fiber MOPAs with high control and high power

SBS mitigation with multi-tone amplification: a theoretical model

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