OPTICAL IMAGE EXPOSING METHOD AND APPARATUS

摘要

A modulator device for modulating a pulsed laser beam in response to a modulation signal, the pulsed laser beam comprising a sequence of laser pulses at a predetermined pulse rate, the modulator device comprising a modulation medium and a driver circuit for applying a control signal to the modulation medium. The driver circuit is adapted to receive the modulation signal and a clock signal indicative of the pulse rate of the laser beam and to generate the control signal as a pulsed signal having a frequency determined from the clock signal, wherein the pulsed control signal is modulated by the modulation signal.