Topic
Fiber laser
About: Fiber laser is a research topic. Over the lifetime, 40094 publications have been published within this topic receiving 569943 citations. The topic is also known as: fibre laser.
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TL;DR: This analysis shows that if the fiber's MFD could be increased arbitrarily, 36 kW of power could be obtained with diffraction-limited quality from a fiber laser or amplifier, but limits to the scaling of the MFD may restrict fiber lasers to lower output powers.
Abstract: We analyze the scalability of diffraction-limited fiber lasers considering thermal, non-linear, damage and pump coupling limits as well as fiber mode field diameter (MFD) restrictions. We derive new general relationships based upon practical considerations. Our analysis shows that if the fiber's MFD could be increased arbitrarily, 36 kW of power could be obtained with diffraction-limited quality from a fiber laser or amplifier. This power limit is determined by thermal and non-linear limits that combine to prevent further power scaling, irrespective of increases in mode size. However, limits to the scaling of the MFD may restrict fiber lasers to lower output powers.
613 citations
TL;DR: In this paper, a detailed overview of stimulated Brillouin scattering (SBS) in single-mode optical fibers is presented, with a particular emphasis on analytical analysis of the backreflected power and SBS threshold in optical fibers with various index profiles.
Abstract: We present a detailed overview of stimulated Brillouin scattering (SBS) in
single-mode optical fibers. The review is divided into two parts. In the first part,
we discuss the fundamentals of SBS. A particular emphasis is given to analytical
calculation of the backreflected power and SBS threshold (SBST) in optical fibers
with various index profiles. For this, we consider acousto-optic interaction in the
guiding geometry and derive the modal overlap integral, which describes the
dependence of the Brillouin gain on the refractive index profile of the optical
fiber. We analyze Stokes backreflected power initiated by thermal phonons, compare
values of the SBST calculated from different approximations, and discuss the SBST
dependence on the fiber length. We also review an analytical approach to calculate
the gain of Brillouin fiber amplifiers (BFAs) in the regime of pump depletion. In the
high-gain regime, fiber loss is a nonnegligible effect and needs to be accounted for
along with the pump depletion. We provide an accurate analytic expression for the BFA
gain and show results of experimental validation. Finally, we review methods to
suppress SBS including index-controlled acoustic guiding or segmented fiber links.
The second part of the review deals with recent advances in fiber-optic applications
where SBS is a relevant effect. In particular, we discuss the impact of SBS on the
radio-over-fiber technology, enhancement of the SBS efficiency in Raman-pumped
fibers, slow light due to SBS and SBS-based optical delay lines, Brillouin
fiber-optic sensors, and SBS mitigation in high-power fiber lasers, as well as SBS in
multimode and microstructured fibers. A detailed derivation of evolutional equations
in the guided wave geometry as well as key physical relations are given in
appendices.
576 citations
TL;DR: Ytterbium-doped silica fibers exhibit very broad absorption and emission bands, from /spl sim/800 nm to /spl sim/1064 nm for absorption and /spl S sim/970 nm to/spl sim s sim/1200 nm for emission as discussed by the authors.
Abstract: Ytterbium-doped silica fibers exhibit very broad absorption and emission bands, from /spl sim/800 nm to /spl sim/1064 nm for absorption and /spl sim/970 nm to /spl sim/1200 nm for emission. The simplicity of the level structure provides freedom from unwanted processes such as excited state absorption, multiphonon nonradiative decay, and concentration quenching. These fiber lasers therefore offer a very efficient and convenient means of wavelength conversion from a wide variety of pump lasers, including AlGaAs and InGaAs diodes and Nd:YAG lasers. Efficient operation with narrow linewidth at any wavelength in the emission range can be conveniently achieved using fiber gratings. A wide range of application for these sources can be anticipated. In this paper, the capabilities of this versatile source are reviewed. Analytical procedures and numerical data are presented to enable design choices to be made for the wide range of operating conditions. >
564 citations
TL;DR: The frequency-doubled light generated in the glass fibers was sufficient to pump a commercial Rh6G dye laser with ~19% efficiency at 570 nm.
Abstract: Efficient frequency doubling of a cw Q-switched and mode-locked Nd:YAG laser has been observed in commercial single-mode optical glass fibers. Pulses of duration ~55 psec and intensities as high as ~0.55 kW were produced at 0.53 μm. The maximum peak power-conversion efficiency measured was ~3%. The frequency-doubled light generated in the glass fibers was sufficient to pump a commercial Rh6G dye laser with ~19% efficiency at 570 nm.
560 citations
TL;DR: This Letter reports on the generation of 830 W compressed average power from a femtosecond fiber chirped pulse amplification (CPA) system and discusses further a scaling potential toward and beyond the kilowatt level by overcoming the current scaling limitations imposed by the transversal spatial hole burning.
Abstract: In this Letter we report on the generation of 830 W compressed average power from a femtosecond fiber chirped pulse amplification (CPA) system In the high-power operation we achieved a compressor throughput of about 90% by using high-efficiency dielectric gratings The output pulse duration of 640 fs at 78 MHz repetition rate results in a peak power of 12 MW Additionally, we discuss further a scaling potential toward and beyond the kilowatt level by overcoming the current scaling limitations imposed by the transversal spatial hole burning
559 citations