Ultrafast nonlinearity of antimony polyphosphate glasses

Abstract

We report on the ultrafast nonlinearity of antimony polyphosphate glasses measured using the Kerr shutter technique. The nonlinear refractive index, n2, was (1.1±0.2)×10−14 cm2/W at 800 nm, and enhancement of n2 by ≈80% was observed by adding 10% of lead oxide in the glass composition. The full width at half-maximum of the third-order correlation signal was 150 fs, which implies a fast response of the samples (⩽100 fs). Nonlinear absorption was negligible in the range of intensities used.

EPR, optical absorption and luminescence studies of Cr3+-doped antimony phosphate glasses

“…Incorporation of metal cations in phosphate glasses also improves its glass forming ability and some physical properties [6]. Antimony phosphate glasses present enhanced non-linear optical properties [7], photosensitivity [8,9], and AC conductivity [4]. Furthermore, Cr 3+ -doped systems have technological applications such as high temperature sensors, tunable solid-state lasers, and others [10][11][12], the Cr 3+ ion being one of the most studied and efficient activators in a host matrix, which possesses luminescence spectrum in the visible and near infra-red region.…”

Glass formation in the Sb2O3-SbPO4-WO3 system

“…The broad absorption bands of the glass samples make difficult a quantitative assignment. The spectrum of sbpw9 (sample containing 10 mol% of WO 3 In Figure 4a are shown the Raman spectra obtained for glasses and for reference compounds. Detailed assignments of the Raman bands for crystalline references were given elsewhere 31 .…”

“…In this work, glasses containing 40 mol% of SbPO 4 showed to be the most stable compositions with Tx-Tg value of 141 °C for the composition 50Sb 2 O 3 -40SbPO 4 -10WO 3 . Due to the higher thermal stability of the compositions containing 40 mol% of SbPO 4 , the series (Sb 2 O 3 ) (0.6-x) (SbPO 4 ) (0.4) (WO 3 ) (x) was chosen to study the influence of the substitution of Sb 2 O 3 by WO 3 , with respect to the structural changes in the glassy network. Thermal analysis (Figure 2a) shows that the addition of WO 3 increases Tg almost linearly for all compositions.…”

“…These materials present low phonon energy (~600-700 cm -1 ) due to low energy stretching vibrations of Sb-O-Sb band 20,21 , high linear and nonlinear refractive indexes [3][4][5] and the possibility of modulation of their optical constants, (refractive index, n, and absorption coefficient, ) under laser irradiation 22 what make them promising materials for 3D optical storage 23,24 as well as, for holographic data storage 25 .…”

“…Antimony oxide based glasses have been the subject of interesting studies in the last years [1][2][3][4][5][6][7][8][9][10][11] and have been claimed to be useful in important fields of the materials science, such as photonics [12][13][14][15][16] and plasmonics [17][18][19] . These materials present low phonon energy (~600-700 cm -1 ) due to low energy stretching vibrations of Sb-O-Sb band 20,21 , high linear and nonlinear refractive indexes [3][4][5] and the possibility of modulation of their optical constants, (refractive index, n, and absorption coefficient, ) under laser irradiation 22 what make them promising materials for 3D optical storage 23,24 as well as, for holographic data storage 25 .…”