Accession Number:

ADA495921

Title:

Demonstration and Verification of a Broad Spectrum Anomalous Dispersion Effects Tool for Index of Refraction and Optical Turbulence Calculations

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT

Personal Author(s):

Report Date:

2009-03-01

Pagination or Media Count:

119.0

Abstract:

An atmospheric optical turbulence strength model with a broad wavelength range of 355nm ultraviolet to 8.6m radio frequencies has been created at AFIT and implemented into the High Energy Laser End-to-End Operational Simulation tool HELEEOS. This modeling and simulation tool is a first principles atmospheric propagation and characterization model. Within HELEEOS lies the High-Resolution Transmission Molecular Absorption HITRAN database, containing 1,734,469 spectral lines for 37 different molecules as of version 12.0 2004. HITRAN affords HELEEOS incredible accuracy for electromagnetic EM propagation prediction. A full understanding of optical turbulence is needed to successfully predict EM radiation propagation, particularly within the application of high energy laser weapon systems. Existing models for optical turbulence do not encompass wide ranges of wavelengths, nor do they include anomalous dispersion effects. Both of these additions have been incorporated into AFITCDEs new optical turbulence strength model. This thesiss objective is to verify and demonstrate the optical turbulence prediction tool. This tool enables predictions to occur in notoriously difficult regions of the spectrum to measure i.e. Terahertz. One can measure optical turbulence at one wavelength and accurately determined optical turbulence at a different wavelength based on the relation of the vertical gradient of the index of refraction to optical turbulence.

Subject Categories:

  • Lasers and Masers
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE