Laser devices being capable of calling freely any desired mode out of a variety of irradiation modes stored beforehead and of reproducing the mode quickly. Specifically, such devices in which a variety of working condition parameters, such as laser output, irradiation time and pulse width, etc., are stored as one set beforehand in a memory within the laser device, and an operator can call a particular mode as the case demands so as to operate the device in a desired state instantly. And further, such devices in which the working condition parameters stored in the said memory can freely be eliminated and changed.