Tunable DFB laser diode based on high-order surface isolation grooves working at 905nm

Abstract A widely tunable distributed feedback Bragg (DFB) laser diode based on surface isolation grooves has been produced by i-line lithography. Periodic p-electrodes on the mesas realize a single longitudinal mode output. The maximum continuous wave output power of the uncoated device was 145.3 mW/facet at 500 mA, and the maximum side-mode suppression ratio was over 37 dB. Experimentally, the laser diode could be tuned from 899.9 to 907.7 nm from 15 ∘ C to 35 ∘ C . The 3 dB linewidth was 920 MHz at 20 ∘ C for an injected current of 300 mA. The method of fabricating the tunable DFB laser diode has great potential for many applications, such as in light detection and ranging (LiDAR) devices.