Laser apparatus

A laser apparatus comprising:

• a seed light source capable of outputting pulsed light as seed light;
• a pumping source which outputs CW light as pump light;
• an optical amplification section which receives the pump light and the seed light and amplifies the seed light;
• a pulse modulator which modulates the seed light source into an operation state of either a repetitive pulse operation state or a CW operation state;
• a pump power controller which adjusts a power of the pump light fed to the optical amplification section;
• and
• a main controller which outputs a signal to indicate a timing of control in the pulse modulator and the pump power controller,
• wherein, based on a timing of the signal output from the main controller, the pump power controller decreases the power of the pump light output from the pumping source to below a predetermined power in a duration in which the pulse modulator maintains the seed light source in the repetitive pulse operation state, prior to a switching timing of the seed light from the pulsed light to CW light at a light entrance end of the optical amplification section.