Abstract
A novel stable resonator is developed to realize stable operation at a TEM00 mode with a large beam diameter. The output coupler has a circular partial-reflection region in the center surrounded by an antireflection region. The transverse mode is mainly selected by the partial-reflection region. An amplified diffraction beam is extracted from the outer antireflection region. By combining part of the ‘‘core’’ beam transmitted from the partial-reflection region with the amplified diffraction beam, a diffraction-limited beam with the M2 factor of 1.3 is obtained from a high power continuous wave CO2 laser as predicted theoretically.
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