All-fiber high-order mode laser using a metal-clad transverse mode filter

Zhang, Yimin; Li, Hongxun; Dai, Chao; Xu, Lixin; Gu, Changzhi; Chen, Wei; Zhu, Yonggang; Yao, Peijun; Zhan, Qiwen

doi:10.1364/oe.26.029679

Cited by 20 publications

(12 citation statements)

References 19 publications

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“…In a previous work of our group, Zhang et al. proposed a high‐order mode oscillating fiber laser on the basis of metal‐clad transverse mode filter . On the other hand, according to the doughnut intensity distribution of CVB, ring‐type beam pump and annular doping can be used to further enhance the efficiency of CVB generation.…”

Section: Introductionmentioning

confidence: 99%

A High‐Efficiency All‐Fiber Laser Operated in High‐Order Mode using Ring‐Core Yb‐Doped Fiber

Zhang

Dong

et al. 2019

Annalen der Physik

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An all-fiber laser generating a cylindrical vector beam is proposed and demonstrated using a home-made ring-core Yb-doped fiber (RC-YDF). In the RC-YDF, not only annular doping but also ring-type beam pump is realized. This is believed to be the first report describing the realization of annular doping and ring-type beam pump in active fiber simultaneously, which can enhance the efficiency for high-order mode oscillation. This laser operates in the high-order mode stably with a slope efficiency of as high as 55.7%. Cylindrical vector modes can be obtained easily through adjusting the polarization controller. This work may have great potential for providing high-efficiency and high-power cylindrical vector beam and vortex beam sources.

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Section: Introductionmentioning

confidence: 99%

A High‐Efficiency All‐Fiber Laser Operated in High‐Order Mode using Ring‐Core Yb‐Doped Fiber

Zhang

Dong

et al. 2019

Annalen der Physik

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“…Previous studies had demonstrated multiple miniature fiber lasers using rare-earth doped microfibers [10][11][12]. On the other hand, higher order transverse modes with more complex modal properties offer additional dimension of freedom to manipulate optical field for various applications, and thus have attracted wide interest on relevant topics ranging from propagation characteristics [13,14], selective mode excitation/conversion [15,16] to particle trapping [17,18], higher order mode lasers [19,20], optical vortex generation [21,22] and so on. To inspect fiber modes, one common method is direct imaging of modal profiles at a fiber's output end.…”

Section: Introductionmentioning

confidence: 99%

Direct observation of multimode interference in rare-earth doped micro/nanofibers

Chen¹,

Bao²,

Tong³

2019

Opt. Express

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Modal inspection of optical fibers is important for multimode application but it is challenging to collect in-situ information of propagating modes for evaluation and manipulation.Here we demonstrate direct observation of multimode interference in Er 3+ /Yb 3+ co-doped micro/nanofibers. Luminescent interference patterns are visualized by visible up-conversion of Er 3+ ions and are used for establishing the existence of higher order modes co-propagating with fundamental modes. We use fast Fourier transform to analyze the patterns in detail and obtain excellent agreement between experiment and calculation on beat lengths of the interference. Effective index differences among higher order modes and a fundamental mode of a microfiber are also experimentally investigated with the assistance of interference patterns, revealing the characteristic of modal dispersions.

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“…Figure 3 shows the scanning electron microscopy (SEM) images of the transverse mode filter which display a smooth surface and uniform diameter. The detailed fabrication process of the transverse mode filter was illustrated in the literature [25]. The transverse mode filter is almost lossless for TE01 mode but not for other modes due to the different intensity distributions near the metal layer and cladding interface, the mechanism of which was explained in our previous work [25].…”

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confidence: 99%

“…Wang et al [23] also reported a fiber laser oscillating at high-order mode by using a wavelength-division-multiplexing (WDM) mode selective coupler (MSC). Our group also demonstrated several fiber lasers operating at LP11 mode based on the polarization dependence of FMFBGs [24] and metal-clad transverse mode filter [25]. However, the main drawback of the research up to now is that the LP11 mode is highly degenerate in the common step-index fiber, and the TE01, TM01, HE21 (even) and HE21 (odd) modes would experience a strong coupling with each other.…”

mentioning

confidence: 99%

“…The detailed fabrication process of the transverse mode filter was illustrated in the literature [25]. The transverse mode filter is almost lossless for TE01 mode but not for other modes due to the different intensity distributions near the metal layer and cladding interface, the mechanism of which was explained in our previous work [25]. FEM is employed to calculate the neff of the modes, Re(neff) and Im(neff) represent the real part and imaginary part of the effective refractive index, respectively.…”

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confidence: 99%

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An all-fiber laser oscillating directly at a single TE₀₁ mode with ring-core fibers

Zhang

Dai

et al. 2019

Appl. Phys. Express

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Cylindrical vector beams (CVBs) have a wide range of applications owing to their particular polarization characteristics and optical field distributions. For the first time, an azimuthally polarized fiber laser without any polarization controller is proposed and demonstrated experimentally.The scheme is based on a self-designed ring-core fiber and transverse mode filter (TMF). The ring-core fiber can break the degeneracy of LP11 modes and make the TE01 mode propagate stably in the fiber laser.The TMF, which made from the ring-core fiber by depositing a layer of Aluminum on the cladding surface, can effectively suppress the modes other than TE01 mode. The fiber laser can stably operate at TE01 mode with a narrow 30dB linewidth of 0.18nm, which indicates the laser is polarization-maintained.This study opens a new avenue toward the true application of CVBs fiber lasers.Recently, researchers have shown an increased interest in cylindrical vector beams (CVBs) because of their unique axisymmetric polarization and doughnut-shaped optical field distributions [1]. These particular characteristics are highly desirable in a wide range of applications, including material processing [2], surface plasmon excitation [3,4], optical trapping and manipulation [5], electron acceleration [6], high-resolution metrology [7,8], optical storage [9] and mode division multiplexing systems [10][11][12]. The systems of generating CVBs in free space is rather complicated and expensive, which made researchers try to find other simpler and more flexible ways. Compared with free space devices, fiber lasers show the advantages of low cost, compactness, high efficiency, flexibility and excellent heat management. The second order mode (LP11 mode) in few-mode fibers is a linear superposition of four degenerate vector modes, including TM01 (radially polarized), TE01 (azimuthally polarized), HE21 (even) and HE21 (odd) modes. In 2002, Grosjean et al. [13] first generated CVBs in fiber lasers by introducing an offset between a single-mode fiber (SMF) and a few-mode fiber (FMF). Since then, several kinds of methods for generating CVBs in fiber lasers have been proposed and demonstrated,

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All-fiber high-order mode laser using a metal-clad transverse mode filter

Cited by 20 publications

References 19 publications

A High‐Efficiency All‐Fiber Laser Operated in High‐Order Mode using Ring‐Core Yb‐Doped Fiber

A High‐Efficiency All‐Fiber Laser Operated in High‐Order Mode using Ring‐Core Yb‐Doped Fiber

Direct observation of multimode interference in rare-earth doped micro/nanofibers

An all-fiber laser oscillating directly at a single TE₀₁ mode with ring-core fibers

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All-fiber high-order mode laser using a metal-clad transverse mode filter

Cited by 20 publications

References 19 publications

A High‐Efficiency All‐Fiber Laser Operated in High‐Order Mode using Ring‐Core Yb‐Doped Fiber

A High‐Efficiency All‐Fiber Laser Operated in High‐Order Mode using Ring‐Core Yb‐Doped Fiber

Direct observation of multimode interference in rare-earth doped micro/nanofibers

An all-fiber laser oscillating directly at a single TE01 mode with ring-core fibers

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An all-fiber laser oscillating directly at a single TE₀₁ mode with ring-core fibers