Abstract

Changes in the refractive index of Ti:Al₂O₃ induced by 10-nsec, 532-nm pump pulses from a frequency-doubled Nd:YAG laser have been measured interferometrically at 632.8 nm for signal polarizations parallel (π) and perpendicular (σ) to the c axis. The nonthermal portion of these changes decays on a 3-μsec time scale characteristic of the fluorescence lifetime of Ti³⁺. For the σ polarization, the nonthermal index change is equal to the concentration of excited Ti³⁺ ions times (4 ± 2) × 10⁻²⁴ cm³. The change for the π polarization is lower by a factor of 3.7 ± 0.6. The average change is consistent with the value estimated from a harmonic oscillator model that considers virtual transitions to a charge-transfer band.

© 1989 Optical Society of America

Amplification of femtosecond pulses in Ti:Al₂O₃ using an injection-seeded laser

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