Luminescence investigation of SiO 2 surfaces damaged by 0.35-nm laser illumination

Kozlowski, Mark R.; Battersby, Colin L.; Demos, Stavros G.

doi:10.1117/12.379338

Cited by 19 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been shown that the laser damage process leads to the formation of a layer of modified material inside the damage crater. [10][11][12] The damage site can nominally include three different sectors: a layer with a modified chemical composition, a layer of mechanically damaged material (crushed, compressed) and a surrounding region of extended cracks. Although numerous previous studies have focused on the mechanisms of LID initiation in as-grown KDP crystals, the properties of the material modified during laser-induced breakdown have received little attention.…”

Section: Introductionmentioning

confidence: 99%

Stoichiometric changes to KH 2 PO 4 during laser-induced breakdown

et al. 2005

Self Cite

View full text Add to dashboard Cite

The local structure of KH 2 PO 4 crystals (so-called KDP) at laser-induced damage sites created by irradiation with ∼ 3-ns, 355-nm laser pulses is studied by a combination of Raman scattering and photoluminescence spectroscopies. We compare spectra from pristine material, surface and bulk laser-induced damage sites, as well as from KPO 3 references. Results show that irradiation with fluences above the laser-induced breakdown threshold leads to stoichiometric changes at surface damage sites but not at bulk damage sites. New spectroscopic features are attributed to dehydration products. For the laser irradiation conditions used in this study, the decomposed near-surface layer absorbs photons at ∼ 3.4 eV (364 nm). These results may help explain the recently reported observation that surface laser damage sites in KDP crystals tend to grow with subsequent exposure to high-power laser pulses, while bulk damage sites do not.

show abstract

Section: Introductionmentioning

confidence: 99%

Stoichiometric changes to KH 2 PO 4 during laser-induced breakdown

et al. 2005

Self Cite

View full text Add to dashboard Cite

show abstract

“…All the spectra on the studied surface flaws show the presence of at least two or three luminescence bands. If two of them have been previously studied in detail and attributed to specific defects in glass silica (1.89 eV: NBOHC and 2.75 eV: ODC), the band at 2.25 eV found in indentation, laser damage, and probably to a very less extent on pristine silica is not clearly interpreted though already observed in laser damage [8,9]. Even if the 2.75 eV band is unambiguously attributed to ODC [5,8,9], it must be noticed that under 3.81 eV excitation, only low yield luminescence should be observed.…”

Section: Discussionmentioning

confidence: 99%

“…The band at 2.75 eV is known to be induced by ODC defects [5,9,11]. We measure a FWHM of 0.75 eV for this peak.…”

Section: High Purity Silicamentioning

confidence: 99%

“…Hence, in order to identify a defect that could trigger damage at 351 nm (3.53 eV), many works have been focused on pristine polished fused silica surfaces as well as on surface flaws (indentation and laser damage). Demos and Kozlowski studied laser damage sites using photoluminescence spectroscopy [8,9]. They reported the existence of two or three luminescence bands depending on the damage site considered.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evidence of a green luminescence band related to surface flaws in high purity silica glass

et al. 2010

View full text Add to dashboard Cite

Using luminescence confocal microscopy under 325 nm laser excitation, we explore the populations of defects existing in or at the vicinity of macroscopic surface flaws in fused silica. We report our luminescence results on two types of surface flaws: laser damage and indentation on fused silica polished surfaces. Luminescence cartographies are made to show the spatial distribution of each kind of defect. Three bands, centered at 1.89 eV, 2.75 eV and 2.25 eV are evidenced on laser damage and indentations. The band centered at 2.25 eV was not previously reported in photo luminescence experiments on indentations and pristine silica, for excitation wavelengths of 325 nm or larger. The luminescent objects, expected to be trapped in sub-surface micro-cracks, are possibly involved in the first step of the laser damage mechanism when fused silica is enlightened at 351 nm laser in nanosecond regime.

show abstract

“…LID is often observed to initiate at the rear surface of fused silica pellicles when acting as a beamsplitter, the physical nature of which is not well understood at present. [1][2][3][4] Nanosecond and subnanosecond laser pulses can induce thermally dominated or shock wave compression damages which can last several nanoseconds after the laser pulse. 5 Moreover, the occurring of rearsurface damages could also be associated to the presence of hot spots in the focused damaging beam and/or to selffocusing and filamentation mechanisms in the bulk.…”

Section: Introductionmentioning

confidence: 99%

Investigations of laser-induced damages in fused silica optics using x-ray laser interferometric microscopy

Margarone

Rus

Kozlová

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

A novel x-ray laser (XRL) application, aimed at understanding the microscopic effects involved in formation of laser-induced damage in optical materials exposed to high-power sub-ns laser pulses, is presented. Standard fused silica substrates with permanent damage threshold below 20 J/cm2, when irradiated by 438 nm laser pulses, were probed in situ by a neonlike zinc XRL at 21.2 nm. The probing beamline employed a double Lloyd’s mirror x-ray interferometer, used in conjunction with an imaging mirror to achieve magnification of ∼8. In conjunction with an array of in situ optical diagnostics, the main question addressed is whether the damage on the rear surface of the beamsplitter is transient or permanent. The second issue, examined by both the x-ray interferometric microscopy and the optical diagnostics, is whether a local rear-surface modification is associated with nonlinear effects such as self-focusing or filamentation of the damaging laser beam in the bulk.

show abstract

Luminescence investigation of SiO 2 surfaces damaged by 0.35-nm laser illumination

Cited by 19 publications

References 0 publications

Stoichiometric changes to KH 2 PO 4 during laser-induced breakdown

Stoichiometric changes to KH 2 PO 4 during laser-induced breakdown

Evidence of a green luminescence band related to surface flaws in high purity silica glass

Investigations of laser-induced damages in fused silica optics using x-ray laser interferometric microscopy

Contact Info

Product

Resources

About