Patent ID: 9620927
Date: 2017-04-11
CPC Classifications: G02B,G02F,H01S

Claim:
1. A high-order harmonic wave generation apparatus for selecting a wavelength, comprising: Porro prisms, arranged on a left side and a right side of a pump head in order to make a fundamental wave, generated by the pump head, insensitive to a change in an external environment; nonlinear crystals for sequentially generating a second-order harmonic wave, a fourth-order harmonic wave, and a fifth-order harmonic wave from the fundamental wave; and final emission units for reflecting and transmitting the second-order harmonic wave, the fourth-order harmonic wave, and the fifth-order harmonic wave and for emitting the harmonic wave without changing an optical path, wherein the nonlinear crystals comprise a second-order harmonic wave generation nonlinear crystal for generating the fundamental wave and the second-order harmonic wave, a fourth-order harmonic wave generation nonlinear crystal for generating the fundamental wave and the fourth-order harmonic wave, and a fifth-order harmonic wave generation nonlinear crystal for generating the fundamental wave and the fifth-order harmonic wave, and wherein the final emission units comprise: a first ultraviolet filter, disposed between the fourth-order harmonic wave generation nonlinear crystal and the fifth-order harmonic wave generation nonlinear crystal, for reflecting the second-order harmonic wave and transmitting the fundamental wave and the fourth-order harmonic wave; a 2-1-th ultraviolet filter, disposed behind the fifth-order harmonic wave generation nonlinear crystal, for transmitting the fundamental wave and the fourth-order harmonic wave and reflecting the fifth-order harmonic wave; and a 2-2-th ultraviolet filter for reflecting and thereby emitting the fifth-order harmonic wave, reflected from the 2-1-th ultraviolet filter.