We have submitted our raw data included in our manuscript titled "Tuning optical properties of densified silica glass via high pressure and ultrafast laser excitation".

Descriptions

fig1.csv

Figure 1 | Linear correlation between density change (Δρ) and refractive index change (Δn) in silica glass.

The refractive index changes (Δn) are presented as a function of density change (Δρ) induced by femtosecond laser direct writing (FLDW) and high-pressure/high-temperature (HPHT) treatments. Data for FLDW were taken from Ponader et al. (36), Bressel et al. (42), Chan et al. (43), and Zhong et al. (44) and for HPHT from Guerette et al. (14) and Masuno et al. (45). The result from our HPHT experiment at 673 K is also plotted using a star symbol. The dotted line represents a linear fit obtained using reference data from various structural modification methods.

fig2A.bmp, fig2B.bmp, fig2C.bmp, fig2D.bmp, fig2E.bmp, fig2F.bmp

fig2M.bmp, fig2N.bmp, fig2O.bmp, fig2P.bmp

Figure 2 | Pressure resistance of Type II modification in silica glass.

Transmission optical microscope images of the laser-irradiated regions. (A) Pristine uncompressed glass, (B) Uncompressed glass after annealing at 673 K for 1 h, (C-F) Glass after FLDW following HPHT treatment, and (M-P) Glass after HPHT treatment following FLDW. Applied pressures: (C, M) 1.4 GPa, (D, N) 2.5 GPa, (E, O) 3.7 GPa, and (F, P) 4.9 GPa. The laser pulse energy was 0.8 µJ.

fig2G.bmp, fig2H.bmp, fig2I.bmp, fig2J.bmp, fig2K.bmp, fig2L.bmp

fig2Q.bmp, fig2R.bmp, fig2S.bmp, fig2T.bmp

Figure 2 | Pressure resistance of Type II modification in silica glass.

Polarization microscope images of the laser-irradiated regions. (G) Pristine uncompressed glass, (H) Uncompressed glass after annealing at 673 K for 1 h, (I-L) Glass after FLDW following HPHT treatment, and (Q-T) Glass after HPHT treatment following FLDW. Applied pressures: (I, Q) 1.4 GPa, (J, R) 2.5 GPa, (K, S) 3.7 GPa, and (L, T) 4.9 GPa. The laser pulse energy was 0.8 $\mu$J.

fig2_ColorLegend_G_H.bmp

Color legend for fig2G.bmp and fig2H.bmpv

fig2_ColorLegend_I-L_Q-T.bmp

Color legend for fig2I-L.bmp and fig2Q-T.bmp

fig2_ScaleBar.bmp

Scale bar for transmission and polarization optical microscope images

fig2U.csv

Pressure resistance of Type II modification in silica glass

fig3A.csv

Figure 3 | Photoluminescence spectra from defect structures in silica glass.

Confocal photoluminescence spectra from defect structures in silica glass excited by 325 nm

fig3B.csv

Figure 3 | Photoluminescence spectra from defect structures in silica glass.

Confocal photoluminescence spectra from defect structures in silica glass excited by 532 nm

fig4A.csv

Figure 4 | Structural evaluation via Raman spectral analysis.
Confocal Raman spectra illustrate the structural changes in silica glass

fig4B.csv

Figure 4 | Structural evaluation via Raman spectral analysis.

Raman main band position as a function of applied pressure

fig4C.csv

Figure 4 | Structural evaluation via Raman spectral analysis.

Raman main band position as a function of laser pulse energy for glass samples

fig5.csv

Figure 5 | In-situ structure factor S(Q) of silica glass under high pressure.

In-situ structure factor S(Q) of silica glass under high pressure

fig6.csvs

Figure 6 | Experimentally observed structure factor S(Q) of silica glass.

Experimentally observed structure factor S(Q) of silica glas

fig7.csv

Figure 7 | Simulated structure factor S(Q) of silica glass.

Simulated structure factor S(Q) of silica glass

fig8A.csv

Figure 8 | Partial radial distribution functions and bond angle distributions.

(A) Partial radial distribution functions (RDFs) for Si-Si pairs

fig8B.csv

Figure 8 | Partial radial distribution functions and bond angle distributions.

(B) Si-O-Si bond angle distributions obtained from simulations

fig8B_Inset.bmp

Figure 8 | Partial radial distribution functions and bond angle distributions.

edge-sharing SiO$_{4}$ tetrahedral configuration

fig9A.csv

Figure 9 | Local pressure, periodic fluctuation, and coherence length in silica glass.

(A) Local pressure as a function of the Raman parameter $\sigma$

fig9B.csv

Figure 9 | Local pressure, periodic fluctuation, and coherence length in silica glass.

(B) Periodic fluctuation and coherence length calculated from the Q1 peak analysis

fig10A.csv

Figure 10 | Distribution of the translational order parameter z for simulated glass structures.

(A) z-distribution evaluated over the entire simulation region

fig10B.csv

Figure 10 | Distribution of the translational order parameter z for simulated glass structures.

(B) z-distribution calculated specifically for atoms within the locally heated region

fig10A_Inset1.bmp

Figure 10 | Distribution of the translational order parameter z for simulated glass structures.

typical configurations of silicon tetrahedral networks at z ~ 2.5

fig10A_Inset2.bmp

Figure 10 | Distribution of the translational order parameter z for simulated glass structures.

typical configurations of silicon tetrahedral networks at z ~ 1.5