Patent ID: 9318869
Filing Date: 2016-04-19
CPC Classification: G01N,G02F,H01S

Claim Text:
1. A laser for generating an output wavelength of approximately 193.4 nm, the laser comprising: a fundamental laser; a first frequency doubling module, coupled to the fundamental laser, for generating a second harmonic; a second frequency doubling module, coupled to the first frequency doubling module, for generating a fourth harmonic; an optical parametric generator, coupled to one of the first frequency doubling module and the fundamental laser, for generating a down-converted signal; and a frequency mixing module, coupled to the optical parametric generator and the second frequency doubling module, for generating a laser output of a frequency equal to a sum of the fourth harmonic and twice a frequency of the down-converted signal, wherein the frequency mixing module comprises two non-linear crystals, a first non-linear crystal configured to generate a frequency equal to a sum of the fourth harmonic and a frequency of the down-converted signal by type-I conversion, and a second non-linear crystal configured to generate the frequency equal to the sum of the fourth harmonic and the twice the frequency of the down-converted signal by type-II conversion, and wherein the fundamental laser generates a fundamental frequency of approximately 1064.3 nm, approximately 1053 nm, approximately 1047 nm, or approximately 1030 nm.