TY - JOUR
T1 - Cooperative upconversion effects on the performance of Er3+-doped phosphate glass waveguide amplifiers
AU - Ohtsuki, T.
AU - Honkanen, S.
AU - Najafi, S. I.
AU - Peyghambarian, N.
PY - 1997/7
Y1 - 1997/7
N2 - The cooperative upconversion processes of erbium ions in silver film ion-exchanged waveguides in a phosphate glass were studied from the pump intensity dependence of luminescence decay curves. Cooperative upconversion coefficients of the 4I13/2 level, 7.7 ± 0.7 × 10-19 and 9.3 ± 0.7 × 10-19 cm3/s, were obtained for an Er3+ concentration of 1 × 1020 cm-3 in bulk and waveguide samples, respectively. These values are 1 order of magnitude smaller than the ones reported for silica glass. The increase in the cooperative upconversion coefficient with the increase in Er3+ concentration was found to be small. The effects of cooperative upconversion on the gain performance were analyzed for different Er3+ concentrations by a theoretical model based on experimentally measured gain with a 1.48-μm pump wavelength. Given the small cooperative upconversion coefficients in this glass, Er3+ concentrations potentially as high as 3.7 × 1020 cm-3 were shown to be feasible. Such high concentrations would result in a 12-dB gain at 150-mW pump power with a 4-cm-long waveguide.
AB - The cooperative upconversion processes of erbium ions in silver film ion-exchanged waveguides in a phosphate glass were studied from the pump intensity dependence of luminescence decay curves. Cooperative upconversion coefficients of the 4I13/2 level, 7.7 ± 0.7 × 10-19 and 9.3 ± 0.7 × 10-19 cm3/s, were obtained for an Er3+ concentration of 1 × 1020 cm-3 in bulk and waveguide samples, respectively. These values are 1 order of magnitude smaller than the ones reported for silica glass. The increase in the cooperative upconversion coefficient with the increase in Er3+ concentration was found to be small. The effects of cooperative upconversion on the gain performance were analyzed for different Er3+ concentrations by a theoretical model based on experimentally measured gain with a 1.48-μm pump wavelength. Given the small cooperative upconversion coefficients in this glass, Er3+ concentrations potentially as high as 3.7 × 1020 cm-3 were shown to be feasible. Such high concentrations would result in a 12-dB gain at 150-mW pump power with a 4-cm-long waveguide.
UR - http://www.scopus.com/inward/record.url?scp=0031536893&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031536893&partnerID=8YFLogxK
U2 - 10.1364/JOSAB.14.001838
DO - 10.1364/JOSAB.14.001838
M3 - Article
AN - SCOPUS:0031536893
SN - 0740-3224
VL - 14
SP - 1838
EP - 1845
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
IS - 7
ER -