Accession Number : ADA289226

Title :   Generation of a Single-Lobe, Far-Field Intensity Pattern From a Laser Diode Array Using an Optical Delay Line.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Summers, Thomas A.

PDF Url : ADA289226

Report Date : DEC 1994

Pagination or Media Count : 97

Abstract : A simple and practical technique is demonstrated to generate a stable, single-lobe, far-field intensity pattern from a one-dimensional, antiphased, laser diode array with gain-guided elements. The two far-field lobes of the array are combined after introducing an optical delay line into the path of one of the lobes to make the lobes mutually incoherent. The incoherent superposition of intensities produces a near-diffraction-limited, single-lobe, far-field intensity pattern containing 84% of the power, exceeding any previous (known) phase control experiments. This technique compares favorably with more elaborate schemes advanced previously using integrated phase plates, etc. The method is directly applicable to one-dimensional laser diode arrays and could be adapted for use with two-dimensional arrays as well.

Descriptors :   *SEMICONDUCTOR LASERS, *OPTICAL COMMUNICATIONS, THESES, SEMICONDUCTOR DIODES, FAR FIELD, INFRARED LASERS, LASER APPLICATIONS, SIDELOBES, DELAY LINES, MICHELSON INTERFEROMETERS.

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE