Stress-state manipulation in fused silica via femtosecond laser irradiation

Bellouard, Yves; Champion, Audrey; McMillen, Ben; Mukherjee, Sebabrata; Thomson, Robert R.; Pépin, Charles; Gillet, Philippe; Cheng, Ya

doi:10.1364/optica.3.001285

Cited by 89 publications

(92 citation statements)

References 52 publications

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“…The negative sign of the topology variation is indicative of a volume reduction (and hence a density increase) in the irradiated area, and is the opposite to what happens when microprocessing is performed in the type 2 regime, with longer (35 fs) and more energetic (about 2 µJ) laser pulses where surface swelling as high as 250 nm was measured [6]. An inversion in the sign of the surface topography is consistent with recent observations reporting a volume reduction of glass cantilevers irradiated in the type 1 regime and a net volume increase of cantilevers irradiated in the type 2 regime [4]. We emphasize that the absence of material re-deposition in the AFM pictures hints towards a purely non-ablative process.…”

supporting

confidence: 85%

“…The spectra were normalized with respect to the amplitude of the ω3 band [28]. They reveal an increase of the D2 peak (centered at 600 cm −1 ) in the irradiated volume, confirming a local laser-induced compaction [3,4]. These micro-Raman measurements were carried out on the top surface of the sample and might not necessarily correspond to the maximum of compaction, presumably located in the center of the laser-induced microstructure (i.e.…”

mentioning

confidence: 90%

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Single-step fabrication of surface waveguides in fused silica with few-cycle laser pulses

Furch¹,

Engel²,

Witting³

et al. 2019

Opt. Lett.

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Direct laser writing of surface waveguides with ultrashort pulses is a crucial achievement towards all-laser manufacturing of photonic integrated circuits sensitive to their environment. In this Letter, few-cycle laser pulses (with a sub-10 fs duration) are used to produce subsurface waveguides in a non-doped, non-coated fused silica substrate. The fabrication technique relies on laser-induced microdensification below the threshold for nanopore formation. The optical losses of the fabricated waveguides are governed by the optical properties of the superstrate. We have measured losses ranging from less than 0.1 dB/mm (air superstrate) up to 2.8 dB/mm when immersion oil is applied on top of the waveguide.

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supporting

confidence: 85%

mentioning

confidence: 90%

Single-step fabrication of surface waveguides in fused silica with few-cycle laser pulses

Furch¹,

Engel²,

Witting³

et al. 2019

Opt. Lett.

View full text Add to dashboard Cite

show abstract

“…These values are in fairly good agreement with the measured values (∼142 nm and ∼72 nm, respectively), although a bit lower in magnitude for SiO 2 . This can be attributed to the stress field contribution associated with the formed nanoplanes [80]. Moreover, it appears that the R values between core and cladding principally differ due to their different laser track lengths, but the calculated form birefringence values from the nanostructures opto-geometrical parameters (see table 2) are somewhat similar (∼6.3×10 −3 in SiO 2 versus ∼5.3×10 −3 in YAS).…”

Section: Laser Irradiationmentioning

confidence: 92%

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

et al. 2019

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In this paper, various types of high temperature fibre Bragg gratings (FBGs) are reviewed, including recent results and advancements in the field. The main motivation of this review is to highlight the potential of fabricating thermally stable refractive index contrasts using femtosecond (fs) nearinfrared radiation in fibres fabricated with non-conventional techniques, such as the molten core method. As a demonstration of this, an yttrium aluminosilicate (YAS) core and pure silica cladding glass optical fibre is fabricated and investigated after being irradiated by an fs laser within the Type II regime. The familiar formation of nanogratings inside both core and cladding regions are identified and studied using birefringence measurements and scanning electron microscopy. The thermal stability of the Type II modifications is then investigated through isochronal annealing experiments (up to T=1100°C; time steps, Δt=30 min). For the YAS core composition, the measured birefringence does not decrease when tested up to 1000°C, while for the SiO 2 cladding under the same conditions, its value decreased by ∼30%. These results suggest that inscription of such 'Type II fs-IR' modifications in YAS fibres could be employed to make FBGs with high thermal stability. This opens the door toward the fabrication of a new range of 'FBG host fibres' suitable for ultra-high temperature operation. ORCID iDsMaxime Cavillon https:/ /orcid.org/0000-0003-1341-6294 Peter Dragic https:/ /orcid.org/0000-0002-4413-9130 Figure 5. Normalized retardance (averaged over the 0.1 to 1.0 μJ pulse energy range) as a function of temperature for YAG-derived fibre at the core center (YAS) and in the cladding (SiO 2 ), for both // and ⊥ configurations. The measurements were performed at room temperature.

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“…The unit cell of a graphene ribbon consists of six sites as sketched in figure 1(a), where each waveguide is separated from its NN by a center-to-center distance 'a'. The interaction between lattice sites is governed by the evanescent coupling which decreases exponentially with the distance between waveguides [12,13]. We define the nearest and next-NN coupling coefficients in figure 1(b), where the horizontal coupling is V 1 , the shortdiagonal one is V 2 , the vertical coefficient is V 3 , and the long-diagonal one is V 4 .…”

Section: The Modelmentioning

confidence: 99%

Observation of localized ground and excited orbitals in graphene photonic ribbons

et al. 2018

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We report on the experimental realization of a quasi-one-dimensional photonic graphene ribbon supporting four flat-bands (FBs). We study the dynamics of fundamental and dipolar modes, which are analogous to the s and p orbitals, respectively. In the experiment, both modes (orbitals) are effectively decoupled from each other, implying two sets of six bands, where two of them are completely flat (dispersionless). Using an image generator setup, we excite the s and p FB modes and demonstrate their non-diffracting propagation for the first time. Our results open an exciting route towards photonic emulation of higher orbital dynamics.

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Stress-state manipulation in fused silica via femtosecond laser irradiation

Cited by 89 publications

References 52 publications

Single-step fabrication of surface waveguides in fused silica with few-cycle laser pulses

Single-step fabrication of surface waveguides in fused silica with few-cycle laser pulses

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

Observation of localized ground and excited orbitals in graphene photonic ribbons

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