A 3.5-kW near-single-mode oscillating–amplifying integrated fiber laser

Zeng, Lingfa; Wang, Xiaolin; Yang, Baolai; Zhang, Hanwei; Xu, Xiaojun

doi:10.1017/hpl.2021.31

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…With the development of fiber preform preparation and mechanical polishing technology, the studies of tapered fibers has evolved to more degrees of freedom along the longitudinal dimension, which is driven by better pump absorption capacity and greater single-mode potential. A series of representative results at several-kilowatt-level have been reported with near single-mode outputs [76,[258][259][260][261][262][263][264][265][266][267][267][268][269][270][271][272][273][274][275][276][277][278][279][280]. Table 2 summarizes the recent progress of tapered fibers for HPFLs applications.…”

Section: Geometric Structures Engineeringmentioning

confidence: 99%

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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The success of high-power fiber lasers is fueled by maturation of active and passive fibers, combined with the availability of high-power fiber-based components. In this contribution, we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems. Subsequently, the emerging functional active and passive fibers in recent years, which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission, are outlined from the perspectives of geometric and material engineering. Finally, novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection, and correspondingly, the high-power progress of function fiber-based components in power handling are introduced, which suggest more flexible controllability on high-power laser operations. Graphical abstract

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Section: Geometric Structures Engineeringmentioning

confidence: 99%

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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“…This new structure consists of an oscillating section and an amplifying section. It conspicuously removes the isolator or cladding light stripper (CLS) between the oscillating section and the amplifying section of the traditional fiber laser amplifier based on master oscillation power amplification (MOPA) which allows the pumping light of forward and backward to obtain a higher utilization, thereby this new structure laser has a higher efficiency [16]. At the same time, the backward light can be reflected by HR-FBG and further amplified in the amplifying section, finally output as target laser, which ensures the good anti-back-reflected light ability of the traditional oscillator [17].…”

Section: Introductionmentioning

confidence: 99%

A Novel Bidirectional Output Oscillating-Amplifying Integrated Fiber Laser With 2 Ports × 2 kW Level Near-Single-Mode Output

et al. 2023

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A novel bidirectional output oscillating-amplifying integrated fiber laser which combines the advantages of the bidirectional output fiber laser oscillator and the oscillatingamplifying integrated fiber laser is proposed and demonstrated experimentally. The influences of the reflectivities and center wavelengths of FBGs on the laser output power and efficiency were studied theoretically. The characteristics of the output laser were studied in detail in experiment. Based on this structure, we finally demonstrated a bidirectional laser output of 2×2-kW level with an active fiber length of 6 m for the oscillating section and 7m for the amplifying section at both ends. The optical-to-optical conversion efficiency is 80.4%. The beam qualities of both ends are 2 A ~1.3 M and 2 ~1.4 B M, which indicates a near-single-mode output. To the best of our knowledge, it was the first time that this structure has been proposed, and its feasibility was demonstrated experimentally.

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“…In some application scenarios, fiber lasers are challenged by harsh environments and/or strong reflecting light. Recently, an oscillating-amplifying integrated fiber laser has been proposed [ 13 , 14 , 15 , 16 ], which has the advantages of high efficiency, environmental robustness, and anti-reflection [ 13 , 14 ]. A 5-kW oscillating-amplifying integrated fiber laser has previously been demonstrated in [ 16 ], which presents a new high-power laser structure for use in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

A 3.7-kW Oscillating-Amplifying Integrated Fiber Laser Featuring a Compact Oval-Shaped Cylinder Package

et al. 2023

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Combining the advantages of high efficiency, environmental robustness, and anti-reflection behavior, oscillating-amplifying integrated fiber lasers have become popular for use in high-power laser structures in industrial applications, wherein the size of the laser source matters. Here, an oscillating-amplifying integrated fiber laser in an oval-shaped cylinder package has been proposed and demonstrated, the footprint for which only occupies an area of 0.024 m2 apart from the pump diode, which is much smaller than in traditional planar fiber laser packages. Numerical simulations have been carried out, which have revealed that an oval-shaped cylinder package can effectively suppress the high-order mode in large mode area fiber setups and thereby benefit the integration of fusion points and the unpackaged elements at the same time. Over 3.7 kW of transverse mode instability (TMI)-free output power has been obtained, with a slope efficiency higher than 80%. With a custom-made chirped and tilted fiber Bragg grating (CTFBG), the Raman suppression ratio is improved to reach 38 dB at peak output power. The oval-shaped design has been verified to assist with the realization of TMI suppression and improve the integration of high-power fiber lasers. To the best of our knowledge, this fiber laser has among the smallest footprints of the various fiber sources at such high-power operating levels.

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A 3.5-kW near-single-mode oscillating–amplifying integrated fiber laser

Cited by 14 publications

References 22 publications

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

A Novel Bidirectional Output Oscillating-Amplifying Integrated Fiber Laser With 2 Ports × 2 kW Level Near-Single-Mode Output

A 3.7-kW Oscillating-Amplifying Integrated Fiber Laser Featuring a Compact Oval-Shaped Cylinder Package

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