Abstract

A numerical model of photorefraction in barium titanate with simultaneous hole and electron photoconductivity and combined deep and secondary photorefractive centers is compared with experimental observations of both continuous-wave (10 mW/cm²–20 W/cm²) and pulsed high-peak-intensity (1–40 MW/cm²) laser illumination. Between 10 mW/cm² and 20 W/cm² (continuous wave) and below ~10 MW/cm² (pulsed) the sample is hole dominated and has a sublinear intensity-dependent response time, whereas above ~12 MW/cm² (pulsed) the crystal displays dominant electron conductivity and has a superlinear intensity-dependent response time.

© 1994 Optical Society of America

Two-secondary-center modeling of photorefraction and comparison with nanosecond pulse illumination experiments in barium titanate

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