Patent ID: 9318870
Filing Date: 2016-04-19
CPC Classification: G01N,G02F,H01S

Claim Text:
1. A laser apparatus for generating output radiation having a wavelength below about 208 nm, comprising: one or more seed radiation sources for generating a first radiation beam having a first fundamental wavelength on a first optical path and a second radiation beam having a second fundamental wavelength on a second optical path, wherein the first radiation beam has a wavelength between 800-850 nm or 905-940 nm and the second radiation beam has a wavelength between about 980-1120 nm; a first amplifier for amplifying the first radiation beam; a second amplifier for amplifying the second radiation beam; and a wavelength conversion module for frequency multiplying and mixing the amplified first and second radiation beams to produce an output beam at a fifth harmonic that is less than about 208 nm, wherein the wavelength conversion module comprises: