Abstract
The polarisation state of some CW CO2 lasers is due to weak anisotropies in the resonator. The possibility of locking the polarisation of such a laser to a stable linear state using internal cavity mirrors at non-normal angles of incidence and the criteria to be used in the construction of such mirrors were investigated. Stable locking of the polarisation of a 5 kW CW CO2 laser was obtained by replacing copper turning mirrors with molybdenum.
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