OPTIMIZATION OF LASERS)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002600020013-9
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: December 9, 2002
• Sequence Number: 13
• Publication Date: February 26, 1965
• Content Type: PERRPT

Approved- Release 2003/01/28: CIA-RDP78BQ470A002600020013-9
SECRET
QUARTERLY REPORT
PAR 217
26 Feb 65
SUBJECT: Optimization of Lasers
TASK/PROBLEM
1. Explore the production of 0.53 micron (blue-green) laser radi-
ation by harmonic doubling in KDP and ADP crystals.
2. Early in this quarter continued empirical effort was directed
toward reducing the lattice work structure in the second harmonic beam
pattern. Having already shown that the structure is not a random phenomenon
(FY-65 No. 2 Quarterly Report, 30 November 1964), attempts were made to de-
termine if this structure was an inherent characteristic of the 1.06 micron
fundamental beam or if it was generated by the K.D.P. crystal.
3. In the initial experiments, a 200mm lens was placed in the beam
path between the KDP crystal and the film plane. Three lens positions were
then chosen such that a cross section through the beam ahead of the crystal,
in the crystal, and beyond the crystal would be in focus. The resulting
exposures indicated that the structure was not dependent on focus. The
only variations were those due to slight changes in magnification. Con-
sistent with these results, it is considered that the crystal might be
acting as a resonant cavity, producing interference fringes due to the
slightly divergent laser beam. The reason for the lattice work structure
rather than a circular or slightly elliptical interference pattern, however,
is not completely understood.
4. At the request of the customer, a literature search was initiated
to provide possible basis for theoretical comparison of the harmonic doubling
technique with other laser techniques for producing visible coherent radia-
tion. The search is being made by the contractor's "Technical Information
Declass Review by NIMA/DOD
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PAR 217
26 Feb 65
Service" group (library). A number of articles from technical journals
were supplied by them near the end of the second period of the quarter.
5. During the second period of the quarter, the contractor's project
monitoring group prepared the attached "Restatement of Goals" for this
project which was also included in the monthly report of 22 January 65.
Laboratory work on this project was stopped at the end of the thirteenth
period, by the departmental supervision of the group to whom this project
is assigned, to await the restatement of project goals.
6. No work has been done on either the beam structure study or on
study of the available literature in the second and third periods of the
quarter.
PLANNED ACTIVITY
7. During the next quarter, we will:
a. Continue the study of the laser beam structure.
b. Study the available literature for a possible comparison
of the harmonic doubling system with other visible light laser systems.
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Approved For Release 2003/01/28 : CIA-RDP78BO477OA002600020013-9