Available Technology

A FOUR-WAVE MIXING SOURCE OF SQUEEZED LIGHT FOR IMAGE PROCESSING AND INTERFEROMETRY.

The phase-sensitive amplifier implementing our chi(3) 4-wave mixing source would be an enabling technology for image processing. A number of efforts in the newly labeled field of "quantum imaging" allow for better detection sensitivity or better image resolution if one is able to apply "squeezed" light with a broad range of spatial modes and frequencies. Such nonclassical light (a quantum mechanical treatment of the electromagnetic field is required) has proved diffcult to produce in the past. Our present source is competitive with, but not quite as good as, the best available chi(2)-based systems in the degree of squeezing we have obtained. On the other hand, it is clearly superior to them in its abilty to produce squeezed light in many spatial modes of the field. It wil allow "noiseless image amplification" and "super-resolution" techniques to be employed in applications well beyond what has been demonstrated with chi(2) media. It should have uses in microscopy and image recovery from weak image data. In addition, a diode-based source should demonstrate squeezing at very low detection frequencies. This should allow the production of a very stable interferometer using our 4-wave mixing source. Such an interferometer would be an excellent detector for highly sensitive chemical detection by photothermal spectroscopy.
Inventors: 
Paul Lett, Colin McCormick, Vincent Boyer
Patent Number: 
7,453,626
Internal Laboratory Ref #: 
07-008
Phone: 
301-975-2573
Email: 
tpo@nist.gov
Lab Representatives
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