Abstract
We present the intracavity generation of beams
with radial polarization at an average output power of
750 W and an optical efficiency of 43% from a continuous
wave thin-disk laser. Circular grating waveguide output
couplers (GWOC) were used to select the radial polarization. The sensitivity of the polarizing function of the GWOC
with regards to the fabrication tolerances is also analysed
in details with a particular emphasis on the effect of the
duty cycle and the geometrical profile of the gratings.
Furthermore, we present the conversion of femtosecond
laser pulses from linear to azimuthal polarization using a
nanograting-based polarization converter. Azimuthally
polarized beams with an average power of up to 850 W, a
pulse duration of 400 fs and a pulse repetition rate of 1 MHz
were generated in this way with a conversion efficiency
of >90%.
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