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We demonstrated a high-power long-wave infrared laser based on a polarization beam coupling technique. An average output power at 
$8.3~\unicode[STIX]{x03BC}\text{m}$ of 7.0 W was achieved at a maximum available pump power of 107.6 W, corresponding to an optical-to-optical conversion of 6.5%. The coupling efficiency of the polarization coupling system was calculated to be approximately 97.2%. With idler single resonance operation, a good beam quality factor of 
${\sim}1.8$ combined with an output wavelength of 
$8.3~\unicode[STIX]{x03BC}\text{m}$ was obtained at the maximum output power.
