31 August 2017 Atmospheric propagation of coherently and incoherently combined quantum cascade lasers
Author Affiliations +
Abstract
Quantum Cascade Lasers represent one of the most significant recent advances in solid state lasers. Their ability to generate mid-IR through THz wavelengths have found numerous application in IR Countermeasures and Remote Sensing for defence, security, and commercial application. In many practical defence and security applications, to achieve the required power levels, it may become desired to combine several beams to form a single focused beam. This paper examines both coherent and incoherent beam combining, and the effects imposed by atmospheric turbulence on the propagation of these combined beams. Here, beam centroid wander and beam spread are analyzed along with their eventual contribution to laser spot size to obtain energy/power on target at range for varying turbulence levels. Interestingly, it is found that there is little difference between the energy/power delivered to a target whether beams are coherently or incoherently combined. Additionally, it is found that there is a maximum intensity that can be propagated to a target that is independent of initial beam quality and size for km-type ranges and at moderate turbulence levels.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert J. Grasso, "Atmospheric propagation of coherently and incoherently combined quantum cascade lasers", Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 104080A (31 August 2017); doi: 10.1117/12.2275867; https://doi.org/10.1117/12.2275867
PROCEEDINGS
16 PAGES + PRESENTATION

SHARE
RELATED CONTENT


Back to Top