Beam combining of quantum cascade laser arrays.
Wavelength beam combining was used to co-propagate beams from 28 elements in an array of distributed-feedback quantum cascade lasers (DFB-QCLs). The beam-quality product of the array, defined as the product of near-field spot size and far-field divergence for the entire array, was improved by a factor of 21 by using wavelength beam combining. To demonstrate the applicability of wavelength beam combined DFB-QCL arrays for remote sensing, we obtained the absorption spectrum of isopropanol at a distance of 6 m from the laser array.
Lee
Benjamin G
BG
Harvard University, School of Engineering and Applied Sciences, Cambridge, MA, USA.
Kansky
Jan
J
Goyal
Anish K
AK
Pflügl
Christian
C
Diehl
Laurent
L
Belkin
Mikhail A
MA
Sanchez
Antonio
A
Capasso
Federico A
FA