SLAB TYPE LASER OSCILLATOR

摘要

PURPOSE:To uniformly irradiate lights emitted from an excitation lamp on the whole surface of a slab type laser element and to obtain emitted lights having a uniform intensity over the whole section of an output laser beam by forming the sectional form in the vertical direction to a barlike lamp on the reflective surface of a condenser into a specific form. CONSTITUTION:The sectional form in the vertical direction to a barlike lamp on the reflective surface of a condenser is so contrived as to be constituted of a base part consisting of profiles to be formed of ellipses of more than two in a constitution; wherein the respective major axes are arranged on the same straight line parallel to the whole reflective surface of an element and also, the neighboring fellow ones are partially overlapped to one another; and the side parts of both ends consisting of straight lines vertical to the whole reflective surface of the element. Moreover, the ellipses of more than two are partially overlapped in a relation that the two neighboring ellipses share one focal point and the barlike lamp for excitation is arranged on the focal axis to be shared. Furthermore, it is desirable that the length ratio of the major axis to the minor axis of the ellipses is nearly 2/3<1/2>, thereby to enhancing the uniformity of irradiation to the surface of the slab type laser element.