Oscillators – Molecular or particle resonant type
Patent
1978-04-11
1980-05-06
Sikes, William L.
Oscillators
Molecular or particle resonant type
331 945G, 350319, H01S 302
Patent
active
042019524
ABSTRACT:
The aerodynamic window is formed of a contiguous pair of gas jet streams driven at subsonic velocity across the entire cross-sectional area of an annular laser beam. One of the jet streams has a shear interface with the interior gas of the laser and has its index of refraction matched to it. The other interfaces with the outside air into which the beam passes and it too has a refraction index matched to the air. Matching of the indices minimizes optical distortion of the beam at the shear interfaces. Distortion produced at the boundary layer of the contiguous jet streams is minimized by equalizing their velocities. To maintain a desired laser cavity pressure, the jet streams are permitted to bend responsively to the pressure differential. The degree of the bending is controlled to reduce window gas consumption.
REFERENCES:
patent: 4112388 (1978-09-01), McLafferty
Avidor Joel M.
Lothrop John W.
Pugh Evan R.
Stewart Charles C.
Critchlow Paul N.
Sciascia Richard S.
Sikes William L.
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