Coherent light generators – Particular beam control device – Mode discrimination
Patent
1984-06-19
1986-05-13
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Mode discrimination
372 95, 372 61, 372 87, H01S 3098
Patent
active
045891141
ABSTRACT:
The present invention is an improved gas laser which includes an elongated cylindrical chamber of cross-sectional dimension which has an internal cylindrical wall and which is suitable for confining a laser gas discharge. The internal cylindrical wall has a plurality of grooves extruded on its internal wall surface. A laser gas is disposed in the elongated cylindrical chamber. A pair of reflectors reflect light energy from the laser gas discharge within the elongated cylindrical chamber so that the light energy travels longitudinally the length of the elongated cylindrical chamber and is optically independent of the internal walls of the elongated cylindrical chamber. The improved gas laser also includes a pair of electrode plates which excite the laser gas and an rf generator which applies a voltage between the pair of electrode plates in order to establish a laser gas discharge in said laser gas. The plurality of grooves provide optical mode control. The pair of reflectors may provide either a stable resonator so that the improved gas laser generates a TEM.sub.00 mode or an unstable (geometric) resonator so that the improved gas laser generates a geometric annular mode.
REFERENCES:
patent: 3939439 (1976-02-01), Fletcher et al.
patent: 4464760 (1984-08-01), Sutter, Jr.
Johansen W. Edward
Jr. Leon Scott
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