Speckle suppression illuminator

Details Speckle suppression illuminator Speckle suppression illuminator

1993-01-11

1993-12-28

Moskowitz, Nelson

Optical: systems and elements

Optical frequency converter

Raman type

359124, G02B 2748, G03B 4100

Patent

active

052744949

ABSTRACT:
Disclosed is a method and apparatus for reducing or eliminating the speckle intensity distribution of an imaging and/or tracking system The benefits of utilizing a highly coherent source (12) as an imaging and tracking system are well known. However, such a coherent source (12) provides a speckle intensity distribution which reduces the effective resolution capability of the imaging system. This invention takes a coherent beam of light (14) and impinges it into a Raman cell (16) to obtain a broad spectral bandwidth beam of light having additional side wavelengths other than the original wavelength. In addition, this invention provides a means to improve the beam quality of all of the Raman lines. Therefore, a composite beam having broad spectral bandwidth composed of individual spectral lines having good beam quality is generated. As a result of the broad spectral bandwidth, images formed from targets illuminated by such a composite beam are substantially free of speckle intensity variations.

REFERENCES:
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patent: 5038359 (1991-08-01), Pepper et al.
Silverstein et al.; "Frequency and Temporal . . . Resolution", Proc. SPIE, vol. 845, pp. 188-189, 1987; abst. only supplied.
Parazzoli et al.; "Stimulated Rotational Raman . . . "; Ntis, Mar. 31, 1989; 230 p.; AN DE 89016427/XAB; abstract only.
Jain et al., "Ultrafast Deep UV . . . Lasers"; Canute du Colloque Int. Micro., pp. 69-72, 1982; abst. only.

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