A laser system includes a travelling-wave active laser-resonator arranged for generating laser-radiation having a first wavelength and arranged such that the first-wavelength radiation circulates in only one direction therein. An optically-nonlinear element is positioned in the travelling-wave laser-resonator such that the first-wavelength radiation circulates therethrough. Radiation having a second-wavelength is injected into the optically-nonlinear crystal such that the first-wavelength radiation and second-wavelength radiation mix therein, thereby generating radiation having the sum-frequency of the first and second-wavelength radiations. The sum-frequency radiation from the optically-nonlinear element is delivered from the laser system as output-radiation. In one example, the travelling-wave resonator has a YVO4 gain medium generating radiation having a wavelength of about 1064 nm. The optically-nonlinear crystal is a CLBO crystal. 244 nm radiation from an intracavity frequency doubled argon laser is injected into the optically-nonlinear crystal providing output radiation having a wavelength of about 195 nm.

Claims

35 · 4 independent · depth 7

35 granted claims

›1.independentA laser system, comprising: first and second active laser-resonators, said first active laser-resonator having an optically-nonlinear crystal therein …+17

›2.↳ 1The laser system of claim 1, wherein said first wavelength is between about 200 and 280 nanometers, said second wavelength is between about 900 and 10…d2+6

›3.↳ 2The laser system of claim 2, wherein said first laser resonator is an OPS-laser resonator including a gain structure having active layers of In.sub.x …d3+2

›5.↳ 2The laser system of claim 2, wherein said first laser resonator is a solid-state laser resonator including a solid-state gain medium selected from the…d3+2

›8.↳ 1The laser system of claim 1, wherein said optically-nonlinear crystal is a crystal of an optically nonlinear material selected from the group consisti…d2

›9.↳ 1The laser system of claim 1, wherein said optically-nonlinear crystal is a CLBO crystal.d2

›11.↳ 1The laser system of claim 1, further including a passive ring-resonator arranged for circulating said second-wavelength radiation through said optical…d2

›12.↳ 1The laser system of claim 1, wherein said optically nonlinear crystal has parallel entrance face and exit-faces, and said second and first-wavelength …d2+6

›13.↳ 12The laser system of claim 12, wherein said third-wavelength radiation has a polarization orientation at ninety degrees to the polarization orientation…d3+5

›14.↳ 13The laser system of claim 13, further including a birefringent element having parallel entrance and exit faces, said entrance face thereof being optic…d4+4

›19.independentA laser system, comprising: a travelling-wave laser-resonator arranged for generating laser-radiation having a first wavelength in a wavelength range …+6

›20.↳ 19The laser system of claim 19, wherein said second-wavelength radiation is injected into said optically-nonlinear crystal and said sum-frequency radiat…d2

›21.↳ 19The laser system of claim 19, wherein said first laser resonator is an OPS-laser resonator including a gain structure having active layers of In.sub.x…d2+1

›23.↳ 19The laser system of claim 19, wherein said first laser resonator is a solid-state laser resonator including a solid-state gain medium selected from th…d2+2

›26.independentA method of generating radiation in a wavelength range between about 175 and 215 nm, comprising the steps of: (a) providing a travelling-wave laser-re…+2

›29.independentA laser system comprising: a laser resonator including at least two mirrors and a nonlinear crystal therebetween for generating laser radiation at a f…+6

›30.↳ 29The laser system of claim 29, wherein the laser radiation of said second wavelength enters the nonlinear crystal without passing through any of said r…d2

›31.↳ 29The laser system of claim 29, wherein said nonlinear crystal is arranged such that said second-wavelength radiation enters said nonlinear crystal at a…d2

›32.↳ 29The laser system of claim 29, wherein said first wavelength radiation is between about 200 and 280 nanometers, said second wavelength radiation is bet…d2

›33.↳ 29The laser system of claim 29, wherein said nonlinear crystal is a crystal of an optically nonlinear material selected from the group consisting of CLB…d2

›34.↳ 29The laser system of claim 29, wherein said nonlinear crystal is a CLBO crystal.d2

›35.↳ 29The laser system of claim 29, further including a passive ring-resonator arranged for circulating said second wavelength radiation through said nonlin…d2

Classifications

8 codes

USPC · US Patent Classification

372/22372/93372/21372/84372/105372/27372/97359/326

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