Mode-Selecting Micrograting Cavity Laser

We demonstrate a novel mode-selecting microcavity laser composed of gratings and a microdisk and fabricated by femtosecond-laser direct-writing technology. The microcavity laser shows good directivity and a single longitudinal mode, resulting from the mode coupling between the microdisk and gratings. The lasing wavelength can be regulated by adjusting the grating period. The properties of the laser were investigated and show good agreement with theoretical calculation and simulation. Based on the behavior and properties, this novel microcavity laser demonstrates good application prospects in integrated microoptics devices.