Femtosecond pulse laser apparatus

A femtosecond pulse laser apparatus comprising:

• a pump light source configured to provide a pump light;
• a gain medium configured to obtain a gain of a laser light using the pump light;
• a first curved mirror and a second curved mirror, which are provided at both sides of the gain medium to reflect the laser light into the gain medium;
• an output mirror configured to transmit a portion of the laser light reflected by the second curved mirror and reflect the other portion of the laser light to the gain medium;
• a mode locking portion configured to generate a femtosecond pulse using a locking mode of the laser light reflected by the first curved mirror;
• and
• an acoustic wave generator connected to the gain medium and configured to provide an acoustic wave into the gain medium so as to adjust a self-phase modulation of the laser light;
• wherein the pump light source comprises:
• a first laser diode configured to generate first pump light;
• a second laser diode configured to generate second pump light having a wavelength shorter than that of the first pump light;
• and
• a third laser diode configured to generate third pump light having a wavelength shorter than that of the second pump light.