Patent ID: 8564875
Filing Date: 2013-10-22
Classification: G02F

Abstract:
1. A terahertz wave generating apparatus comprising: an excitation light source outputting pulsed excitation light; a transmission-type diffraction grating inputting the pulsed excitation light output from the excitation light source, and diffracting and outputting the pulsed excitation light, in which an orientation is variable with a straight central axis, that is parallel to the grooves and passing through an incident position of a principal ray of the pulsed excitation light; a variable imaging optical system inputting the pulsed excitation light diffracted to be output by the transmission-type diffraction grating, and forming an image of the pulsed excitation light by the transmission-type diffraction grating onto a predetermined plane, in which an imaging magnification is variable; and a nonlinear optical crystal, disposed at a position at which the pulsed excitation light is formed as the image by the variable imaging optical system, inputting the pulsed excitation light passing through the variable imaging optical system, and generating a terahertz wave.