Patent ID: 9190800
Filing Date: 2015-11-17
Classification: G02B,H01S

Abstract:
1. A fiber laser apparatus configured to generate Q switched optical pulses, comprising: a first fiber Bragg grating having a first reflective center wavelength; a second fiber Bragg grating having a second reflective center wavelength, the second reflective center wavelength being in a reflective wavelength bandwidth of the first fiber Bragg grating, the first and second fiber Bragg gratings configured to provide optical feedback for laser oscillation and to confine laser oscillation wavelength; at least one long period fiber grating disposed between the first fiber Bragg grating and the second fiber Bragg grating, the long period fiber grating having a switching wavelength in which a switching wavelength bandwidth fully covers the wavelength bandwidth of the first fiber Bragg grating and the second fiber Bragg grating; a gain fiber disposed between the first fiber Bragg grating and the second fiber Bragg grating, the gain fiber configured to provide optical gain; and at least one actuator configured to apply stress to the long period fiber grating to cause switching of Q factor of the laser cavity and generation of Q switched optical pulses.