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.
High-power long-wave infrared laser based on polarization beam coupling technique