Medical laser light source system

A medical laser light source system comprising:

• an excitation laser light source apparatus that generates first excitation light having a wavelength greater than or equal to 1.5 μm and less than or equal to 2.2 μm and second excitation light having a wavelength greater than or equal to 1.5 μm and less than or equal to 2.2 μm and differing from the first excitation light with respect to at least one of oscillation energy intensity, oscillation pulse width, repeating frequency, waveform and peak power;
• an optical fiber that propagates the first excitation light and the second excitation light generated by the excitation laser light source apparatus;
• and
• a laser device that generates a first laser light having a wavelength greater than or equal to 2.7 μm and less than or equal to 3.2 μm, excited by the first excitation light emitted from the optical fiber, and that generates a second laser light excited by the second excitation light, having a wavelength greater than or equal to 2.7 μm and less than or equal to 3.2 μm wherein at least one of oscillation energy intensity, oscillation pulse width, repeating frequency, oscillation waveform and peak power of the second laser light is different from that of the first laser light,
• wherein the laser device is housed in a handpiece arranged at one end of the optical fiber, and
• wherein the handpiece is capable of outputting a laser treatment light by mixing the first laser light and the second laser light.