Raman scattering in silica glass in the permanent densification region

Sugiura, Hiroshi; Yamadaya, T.

doi:10.1016/s0022-3093(05)80395-3

Cited by 47 publications

(26 citation statements)

References 16 publications

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“…From literature data [21], this noticeable shift suggests a densification of approximately 8%, a value which is supported by the shift of the main band. Assuming this level of densification and using Kitamura et al work on shock densified silica [22], we extrapolate a local increase of refractive index of about 3.10 -2 .…”

Section: Micro-raman Analysissupporting

confidence: 60%

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Scanning thermal microscopy and Raman analysis of bulk fused silica exposed to lowenergy femtosecond laser pulses

Bellouard¹,

Barthel²,

Said³

et al. 2008

Opt. Express

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Low energy femtosecond laser pulses locally increase the refractive index and the hydro-fluoric acid etching rate of fused silica. These phenomena form the basis of a direct-write method to fabricate integrated glass devices that are of particular interest for optofluidics and optomechanical applications. Yet the underlying physical mechanism behind these effects remains elusive, especially the role of the laser polarization. Using Scanning Thermal Microscope and Raman spectrometer we observe in laser affected zones, a localized sharp decrease of the thermal conductivity correlated with an increased presence of low-number SiO 2 cycles. In addition, we find that a high correlation exists between the amount of structural changes and the decrease of thermal conductivity. Furthermore, sub-wavelength periodic patterns are detected for high peak power exposures. Finally, our findings indicate that, to date, the localized densification induced by femtosecond laser pulses remains well below the theoretical value achievable in mechanically densified silica.

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Section: Micro-raman Analysissupporting

confidence: 60%

“…The D2 peak is not only the signature of rare 3-tetrahedra cycles but also signals more general structural modifications. It has been demonstrated that the D2-peak shift is sensitive to the density [21]. Unlike the D1-peak shift, the D2-peak shift is relatively easy to measure since its peak does not overlap with the main band.…”

Section: Micro-raman Analysismentioning

confidence: 99%

Scanning thermal microscopy and Raman analysis of bulk fused silica exposed to lowenergy femtosecond laser pulses

Bellouard¹,

Barthel²,

Said³

et al. 2008

Opt. Express

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show abstract

“…The oxygen atoms sit at the corner of each tetrahedron and are shared with two adjacent tetrahedra. The bond angle decreases under a compressive stress and increases under a tensile stress [18]. Bond angle variation can be observed using Raman spectroscopy that provides information related to glass structural changes caused by mechanical stress.…”

Section: Evolution Of Raman Spectra As a Function Of The Deposited Enmentioning

confidence: 99%

Direct volume variation measurements in fused silica specimens exposed to femtosecond laser

Champion¹,

Bellouard²

2012

Opt. Mater. Express

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Abstract:We introduce a new method to investigate localized volume variations resulting from laser exposure. Our method is based on the measurement of fused silica cantilevers deflection from which we calculate the effective stress and density variation in laser-affected zones. Specifically, we investigate density variations in fused silica exposed to femtosecond laser exposure in the regime where nanogratings are found. We demonstrate that a volume expansion is taking place in that particular regime. ©2012 Optical Society of America

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“…Indeed, it appears that a more or less significant phenomenon of permanent densification [12] takes place in addition to the isochoric plastic strain classically observed in metallic materials. This characteristic leads to * Corresponding author.…”

Section: Introductionmentioning

confidence: 97%