A novel fiber laser oscillator employing saddle-shaped core ytterbium-doped fiber

Zeng, Lingfa; Xi, Xiaoming; Ye, Yun; Xi, Lin; Wang, Xiaolin; Li, Jinyan; Shi, Chen; Yang, Baolai; Zhang, Hanwei; Wang, Peng; Zhang, Pu; Xu, Xiaojun

doi:10.1007/s00340-020-07533-1

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…It is noticed that under co-and counter-pump scheme, the output power increases almost linearly with the pump power and the corresponding slope efficiency is up to 83.3% and 86.6%, respectively. Compared to the previously reported saddle-shaped fiber [14,17], the higher slope efficiency is mainly attributed to the improvement of optical fiber manufacturing process, and more precise matching with the passive fibers in the experiment. However, as the output power continued to increase, the roll-over power was observed at output power of ~1810 W in the co-pump scheme, while the corresponding power is ~1520 W in counter-pump scheme, which implies the appearance of the TMI effect.…”

Section: Resultsmentioning

confidence: 65%

Large mode area saddle-shaped core Yb-doped fiber enabled monolithic high-power, high-efficiency, near-diffraction-limited MOPA laser

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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A specially-designed active optical fiber with a constant cladding size and a saddle-shaped profile core is proposed and demonstrated, which called saddle-shaped core (SSC) Yb-doped fiber. The SSC fiber is manufactured through a conventional modified chemical vapor deposition (MCVD) process followed by post-processing of the fiber preforms. The fabricated SSC fiber possesses a large-core region (core/cladding diameter of ∼30/600 μm) at both fiber ends and a small-core region (core/cladding diameter of ∼20.8/600 μm) in the middle length. The output laser characteristics of this SSC fiber are proved through a monolithic high-power continuous-wave MOPA configuration, on the conditions of the co-pumping and counter-pumping manners. It shows that the output lasing powers of co-pumping and counter-pumping regimes are scaled up to ~1.8 kW and ~1.5 kW associated with ~83.3% and ~86.6% slope efficiency, respectively. Before the transverse mode instability (TMI) threshold, a good beam profile quality is measured to M 2 ~1.4, and no evidence of stimulated Raman scattering (SRS) is observed. As far as we know, this is the first demonstration of saddleshaped fiber for kilowatt-level near-single-mode continuous-wave fiber lasers. By further optimizing the fiber design, a higher lasing power connected with near-diffraction-limited beam quality can be achieved in the future.

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Section: Resultsmentioning

confidence: 65%

Large mode area saddle-shaped core Yb-doped fiber enabled monolithic high-power, high-efficiency, near-diffraction-limited MOPA laser

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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“…Unlike the spindle-shaped fiber, saddle-shaped fiber has a symmetrical shrink in the middle section [273,286], as shown in Fig. 4c.…”

Section: Geometric Structures Engineeringmentioning

confidence: 97%

“…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%

“…At the same time, bilateral ends with larger core diameters reduce the power density and increase the nonlinear threshold. Experimentally, a saddle-shaped fiber has been utilized to generate a CW output of over 1.3 kW (M 2 ~ 2.0), the fiber has core diameters in bilateral ends and the middle section of 30 μm and 23 μm, respectively [273]. This is the first demonstration to verify the feasibility of saddle-shaped fiber for HPFLs, although serious misregistration of the core to cladding results in a relatively low optical-to-optical efficiency (~ 46%), this fiber has potential advantages in the power scaling by suppressing SRS and TMI because mode filter works over a long distance in the middle section.…”

Section: Geometric Structures Engineeringmentioning

confidence: 99%

“…It is of primary importance to overcome the tendency of large-mode-area fibers to support multiple modes. In addition to concentrating on the creation of more advanced cross-sectional structures, inner-fiber light manipulation along with the longitudinal direction shows great vitality [76,270,273,275]. Compared with a conventional fiber with uniform size, tapered gain fiber has a larger mode field area and stronger pump absorption, which can suppress nonlinear effects while maintaining good beam quality.…”

Section: Summary and Prospectsmentioning

confidence: 99%

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

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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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High‐Power Laser Systems

Zuo

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2022

Laser & Photonics Reviews

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High‐power laser sources are widely used in industrial precision processing and act as a new platform for strong‐field physics research using peak power over petawatt. This review focuses on realizing high‐energy solid‐state disk and slab systems and the nonlinear‐suppression strategies for high‐power fiber systems using the functional fibers. First, the implementations and enabling technologies of the solid‐state lasers for increasing peak power from gigawatt to petawatt are reviewed. Then the mechanisms and suppression strategies of the deterioration effects (including stimulated Raman scattering, stimulated Brillouin scattering, and transverse mode instability) in various fiber amplifiers are analyzed. At the same time, the mechanism and achievements of the current functional fibers are introduced. Finally, the challenges and perspectives of high‐power solid‐state and fiber amplifiers are summarized.

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A novel fiber laser oscillator employing saddle-shaped core ytterbium-doped fiber

Cited by 10 publications

References 27 publications

Large mode area saddle-shaped core Yb-doped fiber enabled monolithic high-power, high-efficiency, near-diffraction-limited MOPA laser

Large mode area saddle-shaped core Yb-doped fiber enabled monolithic high-power, high-efficiency, near-diffraction-limited MOPA laser

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

High‐Power Laser Systems

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