Abstract
Vertical Cavity Surface Emitting Laser(VCSEL) generally require a beam shaping process before being applied in various scenarios due to the beam propagation characteristics. The beam waist position and size of the VCSEL are critical for beam shaping, associated with the injection current. In this contribution, the theoretical model of the equivalent confocal cavity is innovatively employed to analyze the variation of the beam waist size and the position of VCSEL. Concurrently, a novel approach has been proposed to investigate the variation of the beam waist by measuring the wavefront of the beam transformed by a single lens. The beam waist size is calculated by measuring the far-field divergence of the beam and data reveal that the beam waist diameter decreases from 3.27 μm to 1.15 μm. Combined with the change of beam waist size, the shift of the beam waist position on the optical propagation axis is analyzed in micron level. At the end, we calculate the optimization effect of this study on the beam-collimated.
Published Version
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