Optical information recording and reproducing device and optical information recording and reproducing method

An optical information recording and reproducing method in an optical information recording and reproducing device for recording information on an optical information recording medium and reproducing information from the optical information recording medium, the method comprising:

• a generation step in which a signal light and a reference light are generated;
• a temperature measurement step in which temperature is measured at least at two or more positions;
• a wavelength adjustment step in which a wavelength of the signal light and the reference light is adjusted according to a result of measurement in the temperature measurement step;
• a temperature distribution calculation step in which a temperature distribution is calculated on the basis of the result of measurement in the temperature measurement step;
• and
• a control step in which a recording operation and a reproducing operation are controlled;
• the control step including controlling permission and prohibition of the recording operation or the reproducing operation according to the temperature distribution calculated in the temperature distribution calculation step.