LASER CONTROL DEVICE

摘要

A laser control device capable of resolving a problem that a peak power and a bias power necessary for controlling a laser power cannot be accurately detected when a higher laser modulation speed is encountered, wherein a bias power current Ib is controlled by a computed value of an arithmetic circuit (3) based on a reproduction power current Ir control value of a servo amplifier (5) at a reproducing time immediately before recording, an erase power Pe has its power detected by a sample hold circuit (4) because of its comparatively long duration to control an erase power current Ie by the arithmetic circuit (3), and a peak power Pp is controlled by a computed value of the arithmetic circuit (3) based on the above erase power current Ie, whereby a bottom hold circuit and a peak hold circuit are eliminated and a laser control device not requiring a high-speed performance for a photodiode and a monitor circuit is implemented.