(SANITIZED)PROPOSALS, SPATIAL COHERENT LIGHT VIEWER 21 MAY 1960

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A003100030074-4
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: April 14, 2011
• Sequence Number: 74
• Publication Date: June 3, 1960
• Content Type: MF

Sanitized Copy Approved for Release 2011/04/14: CIA-RDP78BO4747AO03100030074-4
IV
3 June 1960
MEMORANDUM FOR:
Spatial Coherent Light Viewer
21 May 1960
Coherent Light Source
23 May 1960
1. Spatial Coherent Light Viewer
This is a general proposal to study the practical use
of coherent light sources in image viewing.
It suggests that something can be done with li ht
systems other than a single pinhole source as in the Spatial
Viewer. It also suggests that some loss of light coherency can
be tolerated without significant loss of edge enhancement. An
interesting theory is advanced concerning this point, namely that
by mixing diffracted light with coherent, it may be possible to
enhance the contrast of low line numbers without affecting the
enhanced edge gain of high line numbers. This is where I feel
the Itek machine is failing at the moment (apart from.the lack
of light intensity).
The scope of the work would entail investigation of
slit sources, multiple pinhole sources, disk and stop sources
and aperture with ring disk stop sources. The last two are close
to dark field and phase contrast lighting which we have investigated.
The slit source is aim'*I -- +
Luca o vari-snapea.
phase contrast plates to enhance e es parallel to the slit. A
further suggestion is also advanced regarding the use of diffraction
oil as a means of reducing surface irregularities. This we have
also done and found to be true.
in results of investigations into-slit-sources1i1ue~ult pCL be i hole sources. I suggest that we leave this proposal until such
time as Itek have re-worked the spatial viewer, and then consider
it if the spatial viewer is still lacking in essential performance.
2. Coherent Light Source
This is a proposal to study the possibility of producing
Sanitized Copy Approved for Release 2011/04/14: CIA-RDP78BO4747AO03100030074-4
 Sanitized Copy Approved for Release 2011/04/14: CIA-RDP78BO4747AO03100030074-4
ow
an extremely intense coherent light source. N9 price is stated.
In general it discusses the value of a temporal coherent inn P 4L..
radiation source as in a radar system. Two approaches are
theorised both using a Maser like mechanism. One is to obtain
repeated light reflections with a subsequent gain for each
passage, the other by using coherent sources of micro-waves.
It is suggested that this be primarily a paper study
to investigate the two approaches prior to experimental work.
Again I suggest we hold back on this until have 25X1
completed their work on our spatial viewer.
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