We present what we believe are the first experimental results obtained with
modal linear predictive control of an adaptive optics system operating on
sky at a visible wavelength on a 1.52-m telescope (Observatoire de Haute-Pr
ovence, France). This system yields substantially better results than optim
ized integral control: a 30% relative gain in Strehl ratio is measured, eve
n in conditions of low wind speed. (C) 1999 Optical Society of America.