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

10 µm lasing is studied in a compact CO-He cell pressurized up to 15 atm when optically pumped by a ∼50 mJ Fe:ZnSe laser tunable around 4.3 µm. The optimal pump wavelength and partial pressure of CO for generating 10 µm pulses are found to be ∼4.