Method of recording data on optical recording media and optical recording device

A device for recording data on an optical recording medium having a recording layer and a light transmitting layer covering the recording layer, wherein a pulse-modulated laser beam is irradiated onto the recording layer through the light transmitting layer so as to encode and write data to be recorded as recording marks of a length nT by using (n−1) write pulse(s) along a track of the recording layer, where n is an integer and T is one clock cycle, the device comprising, at least:

• an optical device for emitting a laser beam onto the optical recording medium;
• and
• a laser drive device for supplying laser drive signals to modulate the laser beam to emit a pulse series of laser including a write pulse of a write power and a cooling pulse of an approximately bottom power, wherein
• when forming a recording mark of 4 T or longer, a cooling pulse Tcb with a pulse width of 0.8 T to 2 T is inserted before a write pulse that is at the end of the pulse series,
• a cooling pulse Tfoff after the first write pulse has a pulse width of 0.4 T or over to less than 1.0 T, and
• a cooling pulse Toff between the cooling pulse Tfoff and the cooling pulse Tcb has a pulse width of 0.4 T or over to less than 0.8 T.