| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently obtain the laser beam of linear beam form and uniform intensity distribution from the laser light of circular beam form and projected intensity distribution by specifying the arranging direction and pitch of rotary gratings at respective positions on binary optics. SOLUTION: Assuming that a light beam made incident on a point P on the binary optics is diffracted and arrives at a position separated from the binary optics just for a distance (h) and a position parallelly advanced from a point Q on the binary optics just for the distance (h) parallelly with an optical axis at that position within a plane vertical to the optical axis, the point Q is found so as to provide a beam profile having the intensity distribution of power density distribution uniform in uniaxial direction at that position. In order to let the light beam arrive at the point Q on the plane, the arranging direction of diffraction gratings, namely, the extending direction of gratings at the point P on the binary optics is made coincident with the direction of line segment PQ and a pitch (p) of diffraction gratings is defined as p=λ√(1+h<2> /d<2> ). In this case, (d) is a distance PQ.</p> |
