Accession Number : AD1050503


Title :   Exploring Broad Area Quantum Cascade Lasers


Descriptive Note : Technical Report,01 Oct 2015,01 Oct 2017


Corporate Author : Air Force Research Laboratory Kirtland AFB United States


Personal Author(s) : Newell,Tim ; Kaspi,Ron ; Lu,Andy ; Yang,Chi


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1050503.pdf


Report Date : 01 Oct 2017


Pagination or Media Count : 36


Abstract : Quantum Cascade Lasers fabricated for multi-transverse mode operation have seldom been investigated. And yet they exhibit curious behavior such as the coherent locking of low order modes or apparently oscillating in a single but high-order transverse mode. As opposed to the commonly used semiconductor diode laser, quantum cascade lasers are unipolar devices creating photons from electron transitions in the conduction band. This changes their inherent time scales and also leads to a very low line width enhancement factor. Thus their intrinsic performance can be substantially different than their diode counterparts. In this talk we explore a 40-micron wide broad area laser with and without feedback from an external mirror. The interest is to see if feedback can alter the transverse modes, their time scales, and if this feedback leads to nonlinear oscillations and perhaps chaos.


Descriptors :   conduction bands , far field , near field , quantum well , quantum wells , diodes , oscillation , transverse , electron transitions , laser diodes , semiconductors , wave mixing , research laboratories , semiconductors , quantum cascade


Subject Categories : Lasers and Masers


Distribution Statement : APPROVED FOR PUBLIC RELEASE