Image information at 1.6 μ has been converted to the green by mixing it with highly collimated ruby laser radiation in lithium niobate. About 50 lines resolution has been achieved, limited only by the laser beam quality. A tenfold increase on this should be attainable with a single transverse mode laser.
Single-crystal lithium niobate pumped with pulsed ruby-laser radiation has been used to convert 1.7-μ radiation to green light with more than 1% efficiency. A narrow infrared bandwidth of 17 Å, set by the phase-matching requirement only, allows the up-converter and photomultiplier to operate in place of a monochromator and infrared detector, and the emission spectrum of a mercury lamp has been thus examined in the region of 1.7 μ. A close agreement between theory and practice has been found in all respects except noise performance. Further studies of this aspect are required.
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