Laser power control in information recording device

A device for controlling power of pulsed light emitted by a light source, condensed by a object lens and irradiated to a recording medium for recording information in the recording medium, the device comprising:

• a means for test writing with the pulsed light having a fixed bottom power and variable peak power;
• a means for calculating an optimum average power in accordance with the bottom power and the peak power of the optimum condition obtained by the test writing means;
• and
• a means for recalculating the peak power and the bottom power in accordance with the optimum average power so that the peak power is decreased and the bottom power is increased.

A device for recording information comprising:

• a recording medium;
• a light source for emitting pulsed light;
• an optical system for condensing the light from the light source to irradiate the recording medium and for condensing light reflected by the recording medium;
• a photo detector for receiving the condensed light so as to generate a read signal;
• and
• a controller for controlling a drive circuit of the light source in accordance with an output signal of the photo detector, the controller including means for test writing with the pulsed light having a fixed bottom power and variable peak power,
• a means for calculating an optimum average power in accordance with the bottom power and the peak power of the optimum condition obtained by the test writing means, and
• a means for recalculating the peak power and the bottom power in accordance with the optimum average power so that the peak power is decreased and the bottom power is increased.