Optical: systems and elements – Lens – Fluid
Patent
1989-03-03
1991-11-26
Dzierzynski, Paul M.
Optical: systems and elements
Lens
Fluid
359667, G02B 314
Patent
active
050678019
ABSTRACT:
This invention describes a method and an apparatus for refracting a laser beam. The beam can be collimated, focused, or expanded in passage through a series of in-line, orthogonally-mounted modules, each of which utilizes a fully-developed thermal boundary layer within a flow, between two cooled (or heated) parallel plates to produce beam refraction. The laser beam, in passage through this device, traverses only fully-developed thermal boundary layers which generate parabolic density and refractive index profiles, hence produce an undistorted gas lens. Two (three) diverger modules can be mounted in line to produce an emerging beam which is an undistorted, spherical-wave-front diverging (or collimated or focused) beam of elliptical (circular) cross section and the same beam quality as the input beam. This gas lens is usable at high beam power densities much above those that conventional optical materials can withstand. Counter flow may be used within each module to compensate for a streamwise index of refraction gradient, if necessary.
REFERENCES:
Basu et al., "A Proposed 1 KW Average Power Moving Nd; Glass Laser", IEEE Journal of Quantum Electronics, vol. QE-22, No. 10, 10/1986, pp. 2052-2057.
Hofland, Jr. Robert
Mirels Harold
Spencer Donald J.
Burke William J.
Dzierzynski Paul M.
Gass Rebecca D.
The Aerospace Corporation
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