Laser apparatus, exposure head, exposure apparatus, and optical fiber connection method

An exposure using an exposure head, the exposure head including a laser apparatus having a fiber light source which includes an optical fiber with an incidence end and an emission end, a spatial modulation element including numerous pixel portions which are arranged in a two-dimensional form on a support and an optical system, the method comprising:

• emitting laser light by the fiber light source that enters the incidence end of the optical fiber from the emission end of the optical fiber, the optical fiber including an optical fiber having a uniform core diameter and a cladding diameter of the emission end which is smaller than a cladding diameter of the incidence end;
• modulating laser light irradiated from the laser apparatus by the spatial modulation element, the light modulation states being changed in accordance with respective control signals;
• and
• focusing laser light that has been modulated at the pixel portions by the optical system on an exposure surface.