PURPOSE: To facilitate the dust-proof and moisture-proof treatment of the surface of a contracting reflection mirror and to miniaturize the titled device by a method wherein this device is equipped with the contracting reflection concave mirror of the laser resonator inside the body of housing, and the contracting convex mirror inside the projection on the side of the housing.
CONSTITUTION: The concave mirror 13 is placed in the cylindrical body 24 of the housing 2, and the convex mirror 15 that receives the reflected light of the mirror 13 in the swell-out projection 2B on the side of the package. The contraction of the flux of light is carried out inside the housing 2, and, in addition to the miniaturization of the whole device, the mirrors of the contraction system do not become cloudy; therefore the decrease of laser output is prevented. Since a contracted laser beam 6d passes through an output window 9, and the diameter of the window 9 can be reduced, the expensive material of a crystal plate 9 can be saved.
SUGAWARA HIROYUKI
KUWABARA KOUJI
TAKEMORI SEI
SASAKI HIROHARU
YANO MAKOTO
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