POLARIZATION CHARACTERISTICS OF INDEX-GUIDED SURFACE-EMITTING LASERS WITH TILTED PILLAR STRUCTURE

We report precise control of polarization states for index-guided surf ace-emitting lasers by tilted-etching of the laser pillar, Circular la ser pillars were etched by tilting the substrate toward [110] or [1 (1 ) over bar 0] direction with an angle of 15 degrees - 30 degrees using reactive ion beam etching, For the laser device with a diameter of 7- 10 mu m, we observed selectivity of the polarization state, We found a dominant polarization with an electric held perpendicular to the tilt ed direction of laser pillar, The maximum orthogonal polarization supp ression ratio was about 25 dB, The selectivity of polarization in the tilted laser pillar devices is interpreted to be originated from the d ifference in optical losses for the two waves polarized to [110] and [ 1 (1) over bar 0] directions.