Interband cascade lasers

Journal of Lasers, Optics & Photonics

ISSN: 2469-410X

Open Access

Interband cascade lasers

5th International Conference and Exhibition on Lasers, Optics & Photonics

November 28-30, 2016 Atlanta, USA

Jerry R Meyer, C L Canedy, C S Kim, M Kim, W W Bewley and C D Merritt and I Vurgaftman

Naval Research Laboratory, USA
Sotera Defense Solutions, Inc., USA

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

It was long believed that interband mid-IR (?»=3-6 ?¼m) diode lasers must inevitably perform poorly because the Auger nonradiative decay rate scales exponentially with wavelength while the internal loss scales as ?»2-?»3. However, in 2008 an interband cascade laser (ICL) operated in continuous wave (cw) mode at room temperature (RT). By exploiting a semi-metallic interface that under bias provides an internal source of non-equilibrium electrons and holes, ICLs combine the conduction-to-valence band optical transitions of a conventional diode laser with the multiple active stages of a quantum cascade laser (QCL). Both electrons and holes are present in each stage of the ICLâ??s active region, even though the contacts inject and remove only electrons. The ICL is especially advantageous in applications requiring low (e.g., â?¤ 20 mW) single-mode output power at any wavelength in the ?» â?? 3-6 ?¼m range, since itâ??s extremely low threshold power requirement (29 mW reported) is ideal for small-footprint spectroscopic sensing systems driven by battery or solar power. Advances since 2008 include maximum cw operating temperature up to 118 ?ºC, pulsed threshold current density as low as 100-130 A/cm2, and RT cw operation to wavelengths as long as 5.7?¼m. When the number of stages was increased from 5 to 10, narrow ridge ICLs mounted epitaxial side down with HR/AR coatings on the back/front facets emitted RT cw powers up to 500 mW. Shorter cavities displayed wallplug efficiencies up to 18%. We also report interband cascade vertical-cavity surface-emitting lasers (ICVCSELs) that emit in pulsed mode at ?»= 3.4 ?¼m, with threshold current densities as low as 390 A/cm2 at T = 25 ?°C and operation up to 70 ?°C.

Biography :


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