Analysis of the modal evolution in fused-type mode-selective fiber couplers

Pelegrina-Bonilla, Gabriel; Hausmann, Katharina; Sayınc, Hakan; Morgner, Uwe; Neumann, Jörg; Kracht, Dietmar

doi:10.1364/oe.23.022977

Cited by 18 publications

(5 citation statements)

References 36 publications

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“…3(a), the cladding diameters of SMF and TMF optical fibers are 5 µm and 7.8 µm, respectively (the diameter ratio is about 0.64). Because the modal effective refractive index varies with the shape of the fiber, we use weak fusion technique for maintaining the geometry of the SMF and the TMF in order to meet the phase matching condition and improve the mode purity [21], [23]. The advantages of using weakly fused technology are: weakly fused technology can maintain the geometry of both fibers (the coupling region of the coupler can be treated as two touching circular cylinders) and achieve accurate refractive index matching for phase matched mode conversion from LP01 mode (in the SMF) to LP11 mode (in the TMF).…”

Section: Theoretical Analysis and Experimental Setupmentioning

confidence: 99%

Passively Mode-Locked Ytterbium-Doped Fiber Laser With Cylindrical Vector Beam Generation Based on Mode Selective Coupler

Wan

Wang

Zhang

et al. 2018

J. Lightwave Technol.

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We propose and demonstrate, for the first time to the best of our knowledge, a passively mode-locked ytterbium-doped fiber laser generating cylindrical vector beams (CVBs) using a mode selective coupler (MSC) as the transverse mode converter and splitter, and a semiconductor saturable absorber mirror (SESAM) for mode-locking. According to the coupling mode theory and the phase matching principle, the MSC was fabricated by weakly fused technology, having a low loss of about 0.5 dB and achieving LP11 mode with a high purity of > 96%. The CVB fiber laser operates at a center wavelength of 1042.3 nm, with a 3 dB spectral width of 1.5 nm. The repetition rate of the mode-locked laser pulses is 18.58 MHz. The radially and azimuthally polarized vector beams can be switched by adjusting the polarization controllers in the fiber ring cavity, with a high mode purity measured to be > 95%. The mode-locked CVB ytterbium-doped fiber laser has potential applications in optical tweezers, optical imaging, and so on.

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Section: Theoretical Analysis and Experimental Setupmentioning

confidence: 99%

Passively Mode-Locked Ytterbium-Doped Fiber Laser With Cylindrical Vector Beam Generation Based on Mode Selective Coupler

Wan

Wang

Zhang

et al. 2018

J. Lightwave Technol.

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“…In order to achieve high mode purity, we use weak fusion technique for maintaining the geometry of the SMF and the TMF [21], [25]. Furthermore, unlike other mode selective coupler fabrication techniques for which SMF (or FMF) must be pre-tapered, we use technique free of pre-tapering to fabricate the MSC.…”

Section: B Msc Fabricationmentioning

confidence: 99%

A 1- $\mu$ m Cylindrical Vector Beam Fiber Ring Laser Based on a Mode Selective Coupler

Wang

Wan

Cao

et al. 2018

IEEE Photon. Technol. Lett.

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Abstract-We propose and demonstrate a continuous-wave all-fiber ring laser generating cylindrical vector beams (CVBs) using a MSC as transverse mode converter and mode splitter. The MSC is fabricated by a novel method free of pre-tapering, achieving LP 11 mode with a high purity of > 96% near the wavelength of 1064 nm. The CVB fiber laser operates at a center wavelength of 1053.9 nm, with a 3 dB linewidth of less than 0.04 nm and a signal-to-background ratio of > 60 dB. The laser slope efficiency is > 9%. The radially and azimuthally polarized beams can be switched by adjusting the polarization controllers in the fiber ring cavity, with a high mode purity measured to be > 96%.Index Terms-Cylindrical vector beams, optical fiber lasers, mode converter. I. INTRODUCTIONhe cylindrical vector beams (CVBs) includes radially and azimuthally polarized beams [1]. Due to their characteristic of unique axial symmetry in both amplitude field and polarization, CVBs have been widely used in particle physics [2], optical tweezers [3], material processing [4] high-resolution metrology [5], and surface plasmon excitation [6]. Especially the radially polarized beam, which is attracting more and more attention.Various kinds of continuous-wave (CW) CVB generation techniques have been demonstrated with the use of certain spatial polarization selective elements introduced into the laser

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“…The operation principle of this coupler is to phase match the high order mode (LP 11 ) in the TMF with the fundamental mode (LP 01 ) in the SMF, and then to achieve mode conversion. Tapering of the SMF and the TMF is essential for the mode conversion to occur in the two different fibers with different propagation constants [21,22]. In order to achieve high efficiency mode conversion, it is necessary to taper the SMF and the TMF to optimum fiber diameters to meet the phase-matching condition.…”

Section: Fmc Structure and Fabricationmentioning

confidence: 99%

All fiber actively Q-switched Yb-doped laser with radially/azimuthally polarized beam generation

Wan¹,

Wang²,

Shen³

et al. 2018

Laser Phys. Lett.

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We demonstrate, for the first time to the best of our knowledge, an all fiber actively Q-switched Yb-doped laser generating cylindrical vector beams (CVBs) based on a fused mode coupler as the transverse mode converter and selector, and an acousto-optic modulator as the active Q-switching element. The radially and azimuthally polarized beams can be switched by adjusting the polarization controllers in the fiber ring cavity, with high mode purities measured to be >93.5%. Stable ns pulses with repetition rate from 30 Hz to 27 kHz were achieved near the wavelength of 1.0 μm. The actively Q-switched CVB with a pulse width of 68 ns, a pulse energy of 3.46 μJ and a peak power of 50.1 W has been obtained when the repetition rate is 30 Hz and the pump power is 150 mW. This flexible Q-switched fiber laser with pulsed CVB output could find potential applications in the fields of materials processing, nonlinear optics and so on.

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Analysis of the modal evolution in fused-type mode-selective fiber couplers

Cited by 18 publications

References 36 publications

Passively Mode-Locked Ytterbium-Doped Fiber Laser With Cylindrical Vector Beam Generation Based on Mode Selective Coupler

Passively Mode-Locked Ytterbium-Doped Fiber Laser With Cylindrical Vector Beam Generation Based on Mode Selective Coupler

A 1- $\mu$ m Cylindrical Vector Beam Fiber Ring Laser Based on a Mode Selective Coupler

All fiber actively Q-switched Yb-doped laser with radially/azimuthally polarized beam generation

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