Infrared laser system

Abstract

An infrared laser system and method for isotope separation may comprise a molecular gas laser oscillator to produce a laser beam at a first wavelength, Raman spin flip means for shifting the laser to a second wavelength, a molecular gas laser amplifier to amplify said second wavelength laser beam to high power, and optical means for directing the second wavelength, high power laser beam against a desired isotope for selective excitation thereof in a mixture with other isotopes. The optical means may include a medium which shifts the second wavelength high power laser beam to a third wavelength, high power laser beam at a wavelength coincidental with a corresponding vibrational state of said isotope and which is different from vibrational states of other isotopes in the gas mixture.

What is claimed is:  .[.1. An infrared laser irradiation system for generating a high power laser beam at a desired wavelength and narrow line-width for selective excitation of a vibrational state of an isotope in a cooled gaseous mixture containing said isotope at a temperature of from about 35° to 75° K. comprising molecular gas laser oscillator means for producing a laser beam at a first wavelength; Raman spin flip means in optical alignment with said laser beam for shifting said laser beam to a second wavelength; molecular gas laser amplifier means in optical alignment with the wavelength shifted laser beam for amplifying said second wavelength laser beam to said higher power; and optical means for directing said second wavelength beam through said cooled gaseous mixture at said desired wavelength and high power, wherein said second wavelength is intermediate said first wavelength and said desired wavelength and said optical means includes gas absorber means in optical alignment with said second wavelength laser beam for shifting said second and intermediate wavelength laser beam to a high power laser beam having said desired wavelength..]. .[.2. The laser system of claim 1 wherein the gaseous lasing medium in said laser oscillator and said laser amplifier means comprises CO, said first wavelength is at about 5.19 microns, said second wavelength is at about 5.32 microns, and said desired wavelength laser beam is at about 7.75 microns with a line-width less than about 0.01 cm -1  and pulse energy of about 10 -1  to about 1 joules..]. .[.3. The laser system of claim 1 wherein the gaseous lasing medium in said laser oscillator and said laser amplifier means comprises CO, said first wavelength is at about 5.32 microns, said second wavelength is at about 5.72 microns, and said desired wavelength laser beam is at about 8.62 microns with a line-width less than about 0.01 cm -1  and pulse energy of about 10 -3  to 1 joules..]. .[.4. The laser system of claim 1 wherein the gaseous lasing medium in said laser oscillator and said laser amplifier means comprises CO 2 , said first wavelength is at about 9.6 microns, said second wavelength is at about 10.19 microns and said desired wavelength laser beam is at about 16 microns with a line-width less than about 0.01 cm -1  and pulse energy of about 10 -3  to 1 joules..]. .[.5. The laser system of claim 1 wherein said gaseous lasing medium comprises OCS, said first wavelength is at about 8.4 microns and said desired wavelength laser beam is at about 8.62 microns with a line-width of less than about 0.01 cm -1  and pulse energy of about 10 -3  to 1 joules..]. .[.6. The laser system of claim 5 wherein said OCS lasing medium in said laser oscillator means comprises O 12  CS and said OCS lasing medium in said laser amplifier means comprises O 13  CS..]. .[.7. The laser system of claim 6 including means for vibrational transfer pumping of said O 13  CS lasing medium associated with said laser amplifier means including C 13  O 18  mixed with 
     
        said lasing medium..]. 8. A laser system for generating a high power laser beam comprising molecular gas laser oscillator means for producing a laser beam at a first wavelength; Raman spin flip means in optical alignment with said laser beam for shifting said laser beam to a second wavelength; molecular gas laser amplifier means in optical alignment with the wavelength shifted laser beam for amplifying said second wavelength laser beam to said high power; and gas absorber means for shifting .[.said.]. .Iadd.the amplified .Iaddend.second wavelength laser beam to a third wavelength high power laser beam.  .[.9. A method for producing a high power laser beam for selective excitation of a desired isotope specie in a gaseous mixture of isotope species comprising generating an infrared laser beam at a first wavelength; shifting the first wavelength of said laser beam to a second wavelength; amplifying said second wavelength laser beam to said high power; irradiating said gaseous mixture with said high power laser beam to selectively excite said desired isotope specie; and shifting said second wavelength laser beam to a wavelength coincident with a vibrational state of said desired isotope specie separate from vibrational states of said other isotope species in said gas mixture..]. .Iadd. 10. An infrared laser irradiation system for generating a high power laser beam at a desired wavelength and desired linewidth comprising: molecular gas laser oscillator means for producing a laser beam at a first wavelength;   Raman spin flip means in optical alignment with said laser beam for frequency shifting said laser beam to a second wavelength;   molecular gas laser amplifier means in optical alignment with said Raman spin flip means for amplifying said laser beam at said second wavelength to a higher power to produce an amplified second wavelength laser beam;   Raman scattering laser means for frequency shifting said amplified second wavelength laser beam to produce said high power laser beam at said desired wavelength and linewidth. .Iaddend..Iadd. 11. A method for producing a high power laser beam at a preselected wavelength comprising the steps of:   generating an infrared laser beam at a first wavelength;   Raman shifting said first wavelength of said laser beam to a second wavelength;   amplifying said second wavelength laser beam to said high power;   Raman shifting said second wavelength laser beam to said preselected   
     
     
        wavelength. .Iaddend..Iadd. 12.  A laser system for generating a laser signal at approximately 16 μm comprising: CO 2  laser means for producing a laser injection beam at a predetermined frequency;   H 2  Raman scattering means for shifting said predetermined frequency of said laser injection beam to approximately 16 μm using rotational Raman transitions in H 2 . .Iaddend..Iadd. 13. The laser system of claim 12 wherein said predetermined frequency is approximately 10.19 μm. .Iaddend..Iadd. 14. A laser system for generating a laser signal at approximately 7.75 μm comprising:   CO laser means for producing a laser injection beam at a predetermined frequency;   H 2  scattering means for shifting said predetermined frequency of said laser injection beam to approximately 7.75 μm using rotational Raman transitions in H 2 . .Iaddend..Iadd. 15. The laser system of claim 14 wherein said predetermined frequency is approximately 5.32 μm. .Iaddend.