Rectangle Lattice Large Mode Area Photonic Crystal Fiber for 2  $\mu$m Compact High-power Fiber Lasers

Wang, Xin; Lou, Shuqin; Lu, Wenliang

doi:10.1109/jstqe.2014.2310707

Cited by 62 publications

(6 citation statements)

References 23 publications

(23 reference statements)

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“…For the investigatin on bend-induced influence, the wellknown formula n b = n(x)(1 + x/R) [40] is adopted to calculated the refractive index n b (at bent state) with the index n(x) (at straight state) and bending radius R (Detailed schematic diagram is illustrated in figure 7(a)). Here, the x-axis bending orientation is considered for simplicity.…”

Section: Model and Theorymentioning

confidence: 99%

Robust transmission of orbital angular momentum mode based on a dual-cladding photonic quasi-crystal fiber

Liu¹,

Tan²,

Yan³

et al. 2019

J. Phys. D: Appl. Phys.

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A dual-cladding photonic quasi-crystal fiber is theoretically proposed to robustly transmit orbital angular momentum (OAM) modes. This fiber, based on conventional silica background, can lift the effective index separation of constituent vortex modes to the order of 10 −2 in the band of >200 nm, surpassing two orders of magnitude than that of common silica-based fibers. Moreover, the effective index separations in first order group (TE 01 , HE 21 , and TM 01 ) present an opposite and near-linear variation with the increase of air-filling fraction of inner and outer cladding. The mode TE 01 can simultaneously realize an ultra-flattened dispersion with a maximum variation of 19.736 ps/nm/km and low confinement loss of order of 10 −2 dB m −1 within a 400 nm bandwidth covering the communication bands of E, S, C, L and U. Detailed investigation on bend-induced influence shows that this fiber can remain well OAM propagation property with the bending radius being more than 30 μm. In addition, the robustness of OAM property is also stressed with assuming ±3% deviation of diameter of all air holes due to imperfect fiber preparation. This design is expected for the application of OAM optical communication system and to provide guidance for engineering the large-indexseparation fiber.

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Section: Model and Theorymentioning

confidence: 99%

Robust transmission of orbital angular momentum mode based on a dual-cladding photonic quasi-crystal fiber

Liu¹,

Tan²,

Yan³

et al. 2019

J. Phys. D: Appl. Phys.

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“…In order to generate energetic femtosecond pulses at the 1700-nm window, 1-MHz 500-fs pump pulses at 1550-nm from a fiber laser (FLCPA-02CSZU, Calmar) were coupled into a 44-cm PC rod (SC-1500/100-Si-ROD, NKT Photonics) with a 100-µm core diameter. Soliton self-frequency shift (SSFS) [7,8] shifted the soliton to 1665 nm (peak wavelength). A 1635-nm long-pass filter (1635lpf, Omega Optical) was used to remove the residual.…”

Section: Methodsmentioning

confidence: 99%

In vivo deep-brain blood flow speed measurement through third-harmonic generation imaging excited at the 1700-nm window

Liu¹,

Chen²,

Deng³

et al. 2020

Biomed. Opt. Express

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Measurement of the hemodynamic physical parameter blood flow speed in the brain in vivo is key to understanding brain physiology and pathology. 2-photon fluorescence microscopy with single blood vessel resolution is typically used, which necessitates injection of toxic fluorescent dyes. Here we demonstrate a label-free nonlinear optical technique, third-harmonic generation microscopy excited at the 1700-nm window, that is promising for such measurement. Using a simple femtosecond laser system based on soliton self-frequency shift, we can measure blood flow speed through the whole cortical grey matter, even down to the white matter layer. Together with 3-photon fluorescence microscopy, we further demonstrate that the blood vessel walls generate strong THG signals, and that plasma and circulating blood cells are mutually exclusive in space. This technique can be readily applied to brain research.

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“…To investigate the bend properties of LMA PCF, the finite element method model combining with the perfectly matched layer boundary condition is built with COMSOL Multiphysics software. The bend loss, which is confinement loss in this article, can be calculated through the formula [14]:…”

Section: Structure and Principlementioning

confidence: 99%

“…As a rule, 0.1 dB m −1 as the maximum bend loss for FM and 1 dB m −1 as the minimum bend loss for HOMs is considered to be sufficient for single mode operation at bent state [14].…”

Section: Structure and Principlementioning

confidence: 99%

“…With more and more attention paid to 2 μm fiber lasers, the demand of LMA fibers operating at 2 μm is urgent. Orientated to the 2 μm waveband, Wang et al proposed a rectangle lattice LMA photonic crystal fiber (PCF) in 2014 [14]. With the leakage of rectangle lattice, single-mode operation with an effective mode area (EMA) of 2500 μm 2 is realized at a bend radius of 30 cm.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bend-resistant side-leakage photonic crystal fiber with large-mode-area

Xing¹,

Wang²,

Lou³

et al. 2019

J. Opt.

Self Cite

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A bend-resistant side-leakage photonic crystal fiber with large-mode-area (LMA) is proposed. Simulation results demonstrate that the robust single-mode operation is obtained thanks to an extremely high loss ratio (the minimum loss of high order modes to the loss of fundamental mode (FM)) at the wavelength of 2 μm while the bend radius is as small as 10 cm. Meanwhile, the FM suffers a low bend loss of 0.006 dB m−1 with an effective mode area exceeding 2000 μm2. The bend-resistant performance can be maintained over a broad range of wavelengths from 1.75 to 2.5 μm. Except for a wide waveband, a large tolerance for bend radius is also obtained. The fiber is able to operate under single-mode operation within a range of bend radius from 9 to 24 cm. LMA and single-mode operation under a small bend radius make this fiber have great potential in developing compact high power fiber lasers.

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Rectangle Lattice Large Mode Area Photonic Crystal Fiber for 2 $\mu$m Compact High-power Fiber Lasers

Cited by 62 publications

References 23 publications

Robust transmission of orbital angular momentum mode based on a dual-cladding photonic quasi-crystal fiber

Robust transmission of orbital angular momentum mode based on a dual-cladding photonic quasi-crystal fiber

In vivo deep-brain blood flow speed measurement through third-harmonic generation imaging excited at the 1700-nm window

Bend-resistant side-leakage photonic crystal fiber with large-mode-area

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