OPTIMIZATION OF LASERS

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002600020019-3
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 1
• Document Creation Date: December 28, 2016
• Document Release Date: December 9, 2002
• Sequence Number: 19
• Publication Date: October 2, 1964
• Content Type: PERRPT

Approved For.Iease 2003/!RDP78B0477;02600020019-3
MONTHLY REPORT
0
2 Oct 64
SUBJECT: Optimization of Lasers
TASK/PROBLEM
1. Explore the production of 0.53-micron (blue-green) laser radiation
by harmonic doubling in KDP and ADP crystals.
2. During this period quantitative measurements were made of the second
harmonic conversion efficiencies from our one inch long KDP crystal. These
measurements were made using a two meter long laser cavity, and a 104 attenuator
ahead of the harmonic detecting phototube to prevent saturation.
3. The results of these measurements indicated that with 156 joules of
1.06 energy incident on the KDP crystal, over 4 x 10-3 joules of 0.53 radiation
were generated. This represents a conversion efficiency of almost 3 x 10-3
percent, or in terms of second harmonic power, about 4 watts. To further in-
crease this output, either a larger laser rod must be used to afford an increase
in energy or a Q-Switching mechanism incorporated into the setup to decrease the
pulse duration.
4. Current effort is being directed toward a photographic study of the
second harmonic beam structure. The initial exposures on this study were made
of the harmonic beam, unmodified and diverged, incident on a non specular
reflecting surface. The results indicate that the beam is not homogeneous.
Areas within the beam pattern appear to vary in density as much as two orders
of magnitude.
5. This photographic study will continue with emphasis on photographing
the direct harmonic beam and finding possible means to increase its uniformity.
Declass Review by NIMA/DOD
GROUP 1
Excluded $Cpppd *WiR g0Jr3/01
ing and declassification
8: CIA-RDP78BO477OA00260(9 dRET
25X1