Schematic drawing of experimental setup. (a) Layout of the flat He–Ne laser tube. A, anode; K, cathode; T, discharge tube; and B, Brewster window. (b) Cross section of discharge tube T. (c) Schematic drawing of -type fold optical resonator path with flat active medium. , and , mirrors; H, limiting-mode circular-hole diaphragm; L, laser output; and T, discharge tube.
Laser output characteristics using the -type fold optical resonator.
Dependence of laser power on aperture of the circular-hole diaphragm H.
Photographs of output pattern (a) without H; (b) ; (c) ; (d) ; (e) ; (f) ; (g) ; (h) ; and (i) with the resonator of two mirrors in the reported flat He–Ne laser.
Radial luminous intensity distribution of output pattern under and .
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