Abstract: A field effect transistor includes at least one line trench extending downward from a top surface of a channel region which laterally surrounds or underlies the at least one line trench, a gate dielectric contacting all surfaces of the at least one line trench and including a planar gate dielectric portion that extends over an entirety of a top surface of the channel region, a gate electrode, a source region, and a drain region.

Abstract: A laser apparatus for operations comprises a power case containing a power supply, etc., a laser tube container head located over the power case, means for supporting the laser tube container head so as to permit rotation in a horizontal plane and in a manner to enable seesaw motion in a vertical plane, a longitudinally telescoping light guide tube attached longitudinally to the laser tube container head, mirror joints connected with the light guide tube, and a manipulator connected detachably with the mirror joints.

Abstract: A laser optical apparatus for operation under a microscope comprises: a laser beam introducing 45.degree. reflector arranged between two optical axes so as not to impair the range of vision frontwardly of a binocular telescope for operation, a parabolic mirror with a surface displaced from an axis for condensing introduced beams of laser and serving as an objective lens of the microscope, a plane reflector driven by motors to direct the condensed beams of laser and an optical axis of the microscope, and a maneuvering mechanism including a stick for operating said motor.