Patent #6434174
Claims We claim: 1. A repetitively pulsed chemical oxygen-iodine laser, comprising: a resonant cavity defined by a pair of optically aligned reflecting surfaces; a laser medium situated within said resonant cavity, said lasing medium being in the form of a flowing mixture of excited oxygen and iodine atoms, and said flowing mixture of oxygen and iodine producing a laser action within said resonant cavity resulting in a laser beam being output therefrom; and means situated within said resonant cavity for controlling absorption within said resonant cavity in order to pulse said laser beam output, said absorption controlling means including means for producing iodine atoms within an absorption region and means operably associated with said iodine atoms within said absorption region for providing a controllable magnetic field in communication therewith; wherein application of said magnetic field produces transparency within said absorption region and induces said pulsed laser beam output. 2. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 1 wherein said absorption controlling means further comprises a coil of wire for producing said magnetic field and means operably connected to said coil for controlling the strength of said magnetic field. 3. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 1 wherein one of said reflecting surfaces is partially transmissive and said laser beam is output therefrom. 4. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 3 wherein said absorption controlling means is located adjacent said partially transmissive reflective surface. 5. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 4 wherein said absorption controlling means further comprises a coil of wire for producing said magnetic field and means operably connected to said coil for controlling the strength of said magnetic field. 6. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 1 wherein said means for producing iodine atoms comprises a chamber in which molecular iodine interacts with excited oxygen. 7. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 6 wherein said absorption controlling means further comprises a coil of wire for producing said magnetic field and means operably connected to said coil for controlling the strength of said magnetic field. 8. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 1 wherein said means for producing iodine atoms comprises a heated cell capable of thermally disassociating molecular iodine. 9. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 8 wherein said absorption controlling means further comprises a coil of wire for producing said magnetic field and means operably connected to said coil for controlling the strength of said magnetic field. 10. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 1 wherein said resonant cavity comprises an amplification region and an absorption region and wherein said iodine atoms of said absorption controlling means are located in said absorption region of said resonant cavity. 11. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 10 wherein said amplification region and said absorption region are defined by a pair of additional optically aligned reflecting surfaces optically interposed between said pair of optically aligned reflecting surfaces defining said resonant cavity. 12. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 11 wherein said resonant cavity defines a folded resonator. 13. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 10 wherein said absorption controlling means further comprises a coil of wire for producing said magnetic field and means operably connected to said coil for controlling the strength of said magnetic field. 14. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 13 wherein said amplification region and said absorption region are defined by a pair of additional optically aligned reflecting surfaces optically interposed between said pair of optically aligned reflecting surfaces defining said resonant cavity. 15. A repetitively pulsed chemical oxygen-iodine laser as defined in claim 14 wherein said resonant cavity defines a folded resonator.