A Novel Intra-Cavity Lens Design for Compact High Efficiency Tapered Laser Diodes
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.
Beam quality, Gaussian beam, catastrophic optical mirror damage (COMD), diverging lens, high-brightness lasers, high-power lasers, integrated lens, mode expansion, tapered lasers
IEEE Photonic Technology Letters
Lau, FK; TEE, Chyng Wen; Zhao, X; Penty, RV; and White, IH.
A Novel Intra-Cavity Lens Design for Compact High Efficiency Tapered Laser Diodes. (2007). IEEE Photonic Technology Letters. 19, (4), 203-205. Research Collection Lee Kong Chian School Of Business.
Available at: http://ink.library.smu.edu.sg/lkcsb_research/3339