Patent ID: 6901090

Claim:
An exposure apparatus which illuminates a pattern of a first object with ultraviolet light from a laser device and exposes a second object with the ultraviolet light which has passed through the pattern of the first object, wherein the laser device includes: a laser light generation section which generates single wavelength laser light in a wavelength range of from an infrared region to a visible region; an optical modulating section which modulates the laser light generated by the laser light generation section; an optical amplification section including an optical fiber amplifier which amplifies the laser light generated by the optical modulating section; and a wavelength conversion section which performs wavelength conversion of the laser light amplified by the optical amplification section into ultraviolet light by using a nonlinear optical crystal; and the optical modulating section performs pulse modulation of the laser light from the laser light generation section, and feeds the modulated laser light to the optical amplification section in a period in which the ultraviolet light is output, and the optical modulating section feeds light of an amplifiable wavelength zone to the optical amplification section in a range substantially not influencing an output of the ultraviolet light even in a period in which the ultraviolet light is not output.