A photonic crystal fibre Brillouin laser based on fibre Bragg grating Fabry-Perot cavity is presented.A highly nonlinear photonic crystal fibre 25 m in length is used as Brillouin gain medium and fibre Bragg grating Fabry-Perot cavity is chosen in order to enhance the laser conversion efficiency and suppress the higher-order Stokes waves.The laser reaches the threshold at input power of 35 mW,and the experimental laser conversion efficiency achieves 18% of the input power of 140 mW and does not show higher-order Stokes waves.A photonic crystal fibre Brillouin laser with shorter fibre length and lower threshold is experimentally realized.
