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Optical investigation of femtosecond laser induced microstress in neodymium doped lithium niobate crystals
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10.1063/1.2218991
/content/aip/journal/jap/100/3/10.1063/1.2218991
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/3/10.1063/1.2218991

Figures

Image of FIG. 1.
FIG. 1.

(a) SEM picture of machined groove profiles obtained at the surface. Laser fluence was set to and the writing speeds were 50 and for the left and right grooves, respectively. (b) Ablation depths as a function of the femtosecond laser fluence obtained for the two writing speeds used in this work.

Image of FIG. 2.
FIG. 2.

Detail of the cross section corresponding to the ablation groove obtained with an irradiation dose of and with a writing speed of . The two scanning directions analyzed in this work are also schematically drawn.

Image of FIG. 3.
FIG. 3.

Micro-Raman spectra obtained at positions A and B (close and far away from the ablated volume, respectively).

Image of FIG. 4.
FIG. 4.

Raman shift corresponding to the , , , and modes as a function of the distance with respect to the edge of the ablation groove as measured along the Scan 1 direction.

Image of FIG. 5.
FIG. 5.

Spatial dependence of the femtosecond induced stress along the Scan 1 direction. Dots are experimental data and dashed line is a guide for the eye.

Image of FIG. 6.
FIG. 6.

Spatial dependence of the femtosecond induced stress along the Scan 2 direction. Dots are experimental data and dashed line is a guide for the eye.

Image of FIG. 7.
FIG. 7.

Full width at half maximum (FWHM) corresponding to the Raman mode as measured along the Scan 1 direction. Dots are experimental data and dashed line is a guide for the eye.

Image of FIG. 8.
FIG. 8.

Spectral dependence of the emission band of ions as obtained in the proximity and far away from the ablation volume (points A and B, respectively). Inset shows a detail of the energy level diagram of ions in . Arrows indicate the spectral transition analyzed in this work.

Image of FIG. 9.
FIG. 9.

Integrated luminescence along the Scan 1 direction. Dots are experimental data and solid line is a guide for the eye.

Image of FIG. 10.
FIG. 10.

Energy position of the main peak within the emission band located at corresponding to the sub-Stark transition. (a) and (b) correspond to data obtained along the Scan 1 and Scan 2 directions, respectively.

Tables

Generic image for table
Table I.

Raman shifts corresponding to the most significant Raman modes experimentally obtained in the proximity and far away from the ablated volume (points A and B in Fig. 2, respectively). The pressure dependences for each mode (as calculated from the experimental data reported in Ref. 37) are also listed in the last column.

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/content/aip/journal/jap/100/3/10.1063/1.2218991
2006-08-09
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical investigation of femtosecond laser induced microstress in neodymium doped lithium niobate crystals
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/3/10.1063/1.2218991
10.1063/1.2218991
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