Fiber nanogratings induced by femtosecond pulse laser direct writing for in-line polarizer

Lu, Jiakuan; Dai, Yong; Li, Qin; Zhang, Yali; Wang, Chunhua; Liu, Huanhuan; Zeng, Xianglong

doi:10.1039/c8nr06078a

Cited by 22 publications

(11 citation statements)

References 55 publications

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“…the stress induced by writing the waveguide is already asymmetric and sufficiently high for the crack to propagate during subsequent lapping. To inhibit nanograting damage which exacerbates scattering and PDL 31 , a circularly polarized writing beam was used. The pulse density along the scanlines was unusually high at pulses/mm to induce stronger stress and index change, as well as improve crack uniformity.…”

Section: Resultsmentioning

confidence: 99%

Low bend loss femtosecond laser written waveguides exploiting integrated microcrack

Lee

Beresna

et al. 2021

Sci Rep

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We introduce the fabrication and use of microcracks embedded in glass as an optical element for manipulating light propagation, in particular for enhancing waveguide performance in silica integrated optics. By using a femtosecond laser to induce a strong asymmetric stress pattern in silica, uniform cracks with set dimensions can be created within the substrate and propagated along a fixed path. The smoothness of the resulting cleave interface and large index contrast can be exploited to enhance waveguide modal confinement. As a demonstration, we tackle the longstanding high bend-loss issue in femtosecond laser written silica waveguides by using this technique to cleave the outer edge of laser written waveguide bends, to suppress radiative bend loss. The microcrack cross section is estimated to be 15 μm in height and 30 nm in width, for the 10 $$\times$$ × 10 μm waveguides. At 1550 nm wavelength, losses down to 1 dB/cm at 10 mm bend radius were achieved, without introducing additional scattering. Both the cleave stress pattern and waveguide are fabricated with the same multiscan writing procedure, without requiring additional steps, and re-characterisation of the waveguides after 1 year confirm excellent long term performance stability.

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Section: Resultsmentioning

confidence: 99%

Low bend loss femtosecond laser written waveguides exploiting integrated microcrack

Lee

Beresna

et al. 2021

Sci Rep

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“…Owing to their favorable properties, nanogratings have been utilized in integrated optics, such as in wave plates, microreflectors, light attenuators, optical vortex converters, and data storage . However, most of the reported nanogratings are organized by periodic amorphous phases with a structural deficiency, and the formation mechanism is still under debate . Furthermore, few reports have demonstrated their optical applications at communication wavelengths (1310 and 1550 nm).…”

Section: Introductionmentioning

confidence: 99%

“…[11,12] However, most of the reported nanogratings are organized by periodic amorphous phases with a structural deficiency, and the formation mechanism is still under debate. [13][14][15] Furthermore, few reports have demonstrated their optical applications at communication wavelengths (1310 and 1550 nm). In addition, although many phenomena (e.g., refractive index change and microvoids) can be inscribed in various glasses and crystals by ultrafast lasers, interior bulk nanogratings can only be created in limited types of transparent media, such as traditional silica glass, borosilicate glass, and GeO 2 glass.…”

mentioning

confidence: 99%

Self‐Organized Periodic Crystallization in Unconventional Glass Created by an Ultrafast Laser for Optical Attenuation in the Broadband Near‐Infrared Region

Zhang

Tan

Liu

et al. 2019

Advanced Optical Materials

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The construction of functional photonic structures in transparent solids for various applications, such as 3D displays, optical information processing, and tunable lasers, is of great scientific and technological importance. Here, self-assembled crystallite-based grating nanostructures are created in an unconventional multicomponent glass with an ultrafast laser. The novel nanogratings are organized as periodically assembled crystalline and amorphous phases, exhibiting strong polarization-dependent birefringence. The Ta 2 O 5 component in the glass strongly contributes to the creation of nanogratings. Furthermore, a picosecond laser rather than a femtosecond laser is established to more suitably create nanogratings in the target glass, proving the critical role of thermal accumulation during nanoscale crystallization. Finally, nanogratings are demonstrated to be broadband variable near-infrared optical attenuators with a high attenuation ratio,

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“…The most representative ones are microuidic channels applied in the biomedical eld, micro/nano grating applied in the optical eld, trench-like microelectrode applied in the electrochemical eld, etc. 100,101 Therefore, the machining of micro/nano grooves is of great signicance. Laser engraving is currently the most common method of manufacturing.…”

Section: Groove and Channelmentioning

confidence: 99%

Optimization mechanism and applications of ultrafast laser machining towards highly designable 3D micro/nano structuring

Yang

Song

et al. 2022

RSC Adv.

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Fiber nanogratings induced by femtosecond pulse laser direct writing for in-line polarizer

Abstract: Self-organized fiber nanogratings (FNGs) induced by femtosecond pulse laser direct writing are demonstrated in optical silica fibers for the first time.

Cited by 22 publications

References 55 publications

Low bend loss femtosecond laser written waveguides exploiting integrated microcrack

Low bend loss femtosecond laser written waveguides exploiting integrated microcrack

Self‐Organized Periodic Crystallization in Unconventional Glass Created by an Ultrafast Laser for Optical Attenuation in the Broadband Near‐Infrared Region

Optimization mechanism and applications of ultrafast laser machining towards highly designable 3D micro/nano structuring

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