Patent ID: 8929406
Filing Date: 2015-01-06
Classification: G01N,G02F,H01S

Abstract:
1. A laser for generating an output wavelength of approximately 193.4 nm, the laser comprising: a fundamental laser; an optical parametric generator, coupled to the fundamental laser, for generating a down-converted signal; a fourth harmonic generator, coupled to the optical parametric generator, for generating a fourth harmonic; and a frequency mixing module, coupled to the optical parametric generator and the fourth harmonic generator, 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 the frequency of down-converted signal by type-II 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-I conversion.