Portal de Periódicos da CAPES

Effective reflectivity of hyperbolic microlenses

1993; Optica Publishing Group; Volume: 32; Issue: 12 Linguagem: Inglês

10.1364/ao.32.002099

0003-6935

Christopher Edwards, H. M. Presby, L.W. Stulz,

Liquid Crystal Research Advancements

We investigate the effective reflectivity of a hyperbolic microlens. At its position of peak coupling, this type of lens, which couples more power into a single-mode optical fiber than any other reported microlens, is found to reflect ~ -40 dB of the incident optical power back into a typical semiconductor laser. This reflectivity induces a peak-to-peak shift of 3.7 GHz in the lasing frequency of the 1.53-microm multiquantum-well distributed Bragg reflector laser that is tested. The addition of a two-layer dielectric coating diminishes the frequency shift by over an order of magnitude, which corresponds to a lens reflectivity of ~ -60 dB. A comparison is made with standard hemispheric microlenses.