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10 {\mu}m lasing is studied in a compact CO2-He cell pressurized up to 15 atmwhen optically pumped by a ~50 mJ Fe:ZnSe laser tunable around 4.3 {\mu}m. Theoptimal pump wavelength and partial pressure of CO2 for generating 10 {\mu}mpulses are found to be ~4.4 {\mu}m and 0.75 atm, respectively. Without cavityoptimization, the optical-to-optical conversion efficiency reached ~10% at atotal pressure of 7 atm. The gain lifetime is measured to be ~1 {\mu}s atpressures above 10 atm, indicating the feasibility of using high-pressureoptically pumped CO2 for the efficient amplification of picosecond 10 {\mu}mpulses.

Lasing in 15 atm CO2 cell optically pumped by a Fe:ZnSe laser