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Tomoo Fujioka

Shigeru Yamaguchi

Masamori Endoh

The present invention provides a slab type gas laser for generating an excellent output laser beam having substantially Gaussian intensity distribution when it is focused by the lens. For this end, a pair of cylindrical electrodesof different diameter are disposed concentrically by way of spacersand laser medium is filled in the gap between the two cylindrical electrodesto define a straight slabDisposed at one end of the straight slabis a ring-shaped trick mirror MAlso disposed at the center of the one end of the straight slabis an output mirror Mto pass a part of the light and to reflect a part of the remaining light. On the other hand, disposed at the other end of the straight slabis a w-axicon mirror MThe relationship between the center offset Xm and the center position Xof the trick mirror is set to Xm&#x2266;1.1 X

Cylindrical straight slab type gas laser

The present invention provides a cylindrical slab type gas laser for generating an excellent laser beam having substantially Gaussian intensity distribution of the focussed output laser beam. For this end, a pair of cylindrical electrodesof different diameter are disposed vertically and concentrically. And laser medium is filled in the gap between the two cylindrical electrodesto define a cylindrical straight slab. Disposed at one end of the cylindrical top of the cylindrical straight slabis a ring-shaped trick mirror Mand also disposed at the center of the one end of the cylindrical straight slabis an output mirror Mto pass a part of the light and to reflect a part of the remaining light. On the other hand, disposed at the other end of the cylindrical straight slabis a w-axicon mirror M. The above construction eliminates the need for spacers between the two cylindrical electrodeswhich are required in a conventional gas laser.

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Kanagawa-ken, Japan

Tomoo Fujioka