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;
• 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;
• a wavefront sensor configured to detect a first wavefront of the laser light;
• an adaptive window provided between the pump light source and the first curved mirror and configured to partially adjust a second wavefront of the pump light;
• and
• a controller connected to the wavefront sensor and the adaptive window to distinguish the first wavefront of the laser light, the controller configured to adjust the second wavefront of the pump light in the adaptive window based on the first wavefront.