Beam Divergence: The Measurement of Nanosecond Laser Pulses.

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Abstract:

The divergence of a laser beam is a measure of the rate at which the energy in the beam spreads. There are many ways of measuring the divergence of nanosecond pulses. The data reduction needed to gain accuracies of less than plus or minus 15 involves the expenditure of considerable time. The methods which give results in a short time generally have accuracies of plus or minus 20 or worse. Two of the more accurate methods which are based on photography, the Winer technique and Hartmann method, are compared. Also, a mechanized technique known as SRTLAS, Semi-Real Time Laser Analysis Scanning is discussed. The 40 ns pulses measured during the comparison were produced by a NdGlass laser operating at 1.06 micrometer. Modified author abstract

Author(s):
Caldwell, Douglas E.
Author Organization(s):
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
Descriptive Note:
Master's thesis,
Pagination:
0098

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
GEP-PH-73-5
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*LASERS, LIGHT PULSES), (*INFRARED LASERS, LIGHT PULSES), INFRARED RADIATION, COHERENT RADIATION, DEFLECTION, TEST METHODS, TEST EQUIPMENT, EXPERIMENTAL DESIGN, THESES, COMPUTER PROGRAMS
Field(s)/Group(s):
Lasers and Masers
Keyword(s):
*LASER BEAMS, NEODYMIUM GLASS LASERS, BEAM WIDTH, PULSED LASERS, DIVERGENCE
Report Date:
1973 Jun 01