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A Novel Intracavity Lens Design for Compact and High Efficiency Tapered Laser Diode

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6 Author(s)
F. K. Lau ; Centre for Adv. Photonics & Electron., Cambridge Univ. ; C. W. Tee ; R. V. Penty ; I. H. White
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An integrated parabolic lens capable of introducing a diverging effect to the optical mode propagating within the cavity of a tapered laser is proposed and demonstrated. This idea allows broader high-power beams to be generated by shorter cavities. Diverging lenses with etch depths of 0.13 and 0.27 mum are implemented, with 12 (9.5%) and 16.8 mum (13.3%) overall broadening of the near-fields widths measured at 1/e2 intensity. The peak output power as well as the threshold current is found to increase following the lens etching process, confirming the beneficial broadening effect introduced by the diverging lens

Published in:

IEEE Photonics Technology Letters  (Volume:19 ,  Issue: 4 )