Semiconductor laser apparatus, information recording/reproduction apparatus and image recording apparatus

An information recording/reproducing apparatus comprising:

• a semiconductor laser apparatus including,
• a semiconductor laser,
• a light intensity detector configured to detect intensity of a laser beam output from the semiconductor laser,
• an amplifying circuit including a non-reversal input terminal and a reversal input terminal that are each configured to receive predetermined input signals, the reversal input terminal being further configured to receive an output signal from the light intensity detector as a negative feedback signal,
• a high-frequency signal generating circuit configured to generate a high-frequency signal having a predetermined frequency,
• a high-frequency signal superimposing circuit configured to superimpose the high-frequency signal from the high-frequency generating circuit onto an output signal of the amplifying circuit,
• a laser drive circuit configured to supply a drive current to the semiconductor laser on the basis of the output signal from the amplifying circuit having the superimposed high frequency signal thereon, and
• a modulation signal current generating section configured to apply a modulation signal current to the reversal input terminal of the amplifying circuit so as to adjust an amount of laser beam light from the semiconductor laser;
• an optical system configured to irradiate the laser beam from the semiconductor laser apparatus onto a recording medium;
• a detection section configured to detect laser beam light reflected from the recording medium and to provide an output based thereon;
• a reproduction signal generating section configured to receive the output from the detection section and to generate a reproduction signal based thereon;
• and
• a control signal generating section configured to generate a control signal to be supplied to the semiconductor laser apparatus.